In the wake of the Great Recession of 2009, there has been a good deal of focus on employment statistics, one of the most important metrics policymakers use to gauge the overall strength of the economy. In the United States, the government measures unemployment using the Current Population Survey (CPS), which collects demographic and employment information from a wide range of Americans each month. In this exercise, we will employ the topics reviewed in the lectures as well as a few new techniques using the September 2013 version of this rich, nationally representative dataset (available online).

The observations in the dataset represent people surveyed in the September 2013 CPS who actually completed a survey. While the full dataset has 385 variables, in this exercise we will use a more compact version of the dataset, CPSData.csv, which has the following variables:

PeopleInHousehold: The number of people in the interviewee’s household.

Region: The census region where the interviewee lives.

State: The state where the interviewee lives.

MetroAreaCode: A code that identifies the metropolitan area in which the interviewee lives (missing if the interviewee does not live in a metropolitan area). The mapping from codes to names of metropolitan areas is provided in the file MetroAreaCodes.csv.

Age: The age, in years, of the interviewee. 80 represents people aged 80-84, and 85 represents people aged 85 and higher.

Married: The marriage status of the interviewee.

Sex: The sex of the interviewee.

Education: The maximum level of education obtained by the interviewee.

Race: The race of the interviewee.

Hispanic: Whether the interviewee is of Hispanic ethnicity.

CountryOfBirthCode: A code identifying the country of birth of the interviewee. The mapping from codes to names of countries is provided in the file CountryCodes.csv.

Citizenship: The United States citizenship status of the interviewee.

EmploymentStatus: The status of employment of the interviewee.

Industry: The industry of employment of the interviewee (only available if they are employed).

Section 1 - Loading and Summarizing the Dataset

1.1

Load the dataset from CPSData.csv into a data frame called CPS, and view the dataset with the summary() and str() commands.

CPS = read.csv("Unit1/CPSData.csv")
summary(CPS)
 PeopleInHousehold       Region     
 Min.   : 1.000    Midwest  :30684  
 1st Qu.: 2.000    Northeast:25939  
 Median : 3.000    South    :41502  
 Mean   : 3.284    West     :33177  
 3rd Qu.: 4.000                     
 Max.   :15.000                     
                                    
          State       MetroAreaCode        Age       
 California  :11570   Min.   :10420   Min.   : 0.00  
 Texas       : 7077   1st Qu.:21780   1st Qu.:19.00  
 New York    : 5595   Median :34740   Median :39.00  
 Florida     : 5149   Mean   :35075   Mean   :38.83  
 Pennsylvania: 3930   3rd Qu.:41860   3rd Qu.:57.00  
 Illinois    : 3912   Max.   :79600   Max.   :85.00  
 (Other)     :94069   NA's   :34238                  
          Married          Sex       
 Divorced     :11151   Female:67481  
 Married      :55509   Male  :63821  
 Never Married:30772                 
 Separated    : 2027                 
 Widowed      : 6505                 
 NA's         :25338                 
                                     
                   Education    
 High school            :30906  
 Bachelor's degree      :19443  
 Some college, no degree:18863  
 No high school diploma :16095  
 Associate degree       : 9913  
 (Other)                :10744  
 NA's                   :25338  
               Race           Hispanic     
 American Indian :  1433   Min.   :0.0000  
 Asian           :  6520   1st Qu.:0.0000  
 Black           : 13913   Median :0.0000  
 Multiracial     :  2897   Mean   :0.1393  
 Pacific Islander:   618   3rd Qu.:0.0000  
 White           :105921   Max.   :1.0000  
                                           
 CountryOfBirthCode               Citizenship    
 Min.   : 57.00     Citizen, Native     :116639  
 1st Qu.: 57.00     Citizen, Naturalized:  7073  
 Median : 57.00     Non-Citizen         :  7590  
 Mean   : 82.68                                  
 3rd Qu.: 57.00                                  
 Max.   :555.00                                  
                                                 
           EmploymentStatus
 Disabled          : 5712  
 Employed          :61733  
 Not in Labor Force:15246  
 Retired           :18619  
 Unemployed        : 4203  
 NA's              :25789  
                           
                               Industry    
 Educational and health services   :15017  
 Trade                             : 8933  
 Professional and business services: 7519  
 Manufacturing                     : 6791  
 Leisure and hospitality           : 6364  
 (Other)                           :21618  
 NA's                              :65060  
str(CPS)
'data.frame':   131302 obs. of  14 variables:
 $ PeopleInHousehold : int  1 3 3 3 3 3 3 2 2 2 ...
 $ Region            : Factor w/ 4 levels "Midwest","Northeast",..: 3 3 3 3 3 3 3 3 3 3 ...
 $ State             : Factor w/ 51 levels "Alabama","Alaska",..: 1 1 1 1 1 1 1 1 1 1 ...
 $ MetroAreaCode     : int  26620 13820 13820 13820 26620 26620 26620 33660 33660 26620 ...
 $ Age               : int  85 21 37 18 52 24 26 71 43 52 ...
 $ Married           : Factor w/ 5 levels "Divorced","Married",..: 5 3 3 3 5 3 3 1 1 3 ...
 $ Sex               : Factor w/ 2 levels "Female","Male": 1 2 1 2 1 2 2 1 2 2 ...
 $ Education         : Factor w/ 8 levels "Associate degree",..: 1 4 4 6 1 2 4 4 4 2 ...
 $ Race              : Factor w/ 6 levels "American Indian",..: 6 3 3 3 6 6 6 6 6 6 ...
 $ Hispanic          : int  0 0 0 0 0 0 0 0 0 0 ...
 $ CountryOfBirthCode: int  57 57 57 57 57 57 57 57 57 57 ...
 $ Citizenship       : Factor w/ 3 levels "Citizen, Native",..: 1 1 1 1 1 1 1 1 1 1 ...
 $ EmploymentStatus  : Factor w/ 5 levels "Disabled","Employed",..: 4 5 1 3 2 2 2 2 3 2 ...
 $ Industry          : Factor w/ 14 levels "Agriculture, forestry, fishing, and hunting",..: NA 11 NA NA 11 4 14 4 NA 12 ...

1.2

Among the interviewees with a value reported for the Industry variable, what is the most common industry of employment? Please enter the name exactly how you see it.

ANSWER: Educational and health services 

1.3

Recall from the homework assignment “The Analytical Detective” that you can call the sort() function on the output of the table() function to obtain a sorted breakdown of a variable. For instance, sort(table(CPS$Region)) sorts the regions by the number of interviewees from that region.

Which state has the fewest interviewees?

sort(table(CPS$Region))

Northeast   Midwest      West     South 
    25939     30684     33177     41502 

Which state has the largest number of interviewees?

ANSWER: South

1.4

What proportion of interviewees are citizens of the United States?

7590/(116639+7073)
[1] 0.06135217

1.5

The CPS differentiates between race (with possible values American Indian, Asian, Black, Pacific Islander, White, or Multiracial) and ethnicity. A number of interviewees are of Hispanic ethnicity, as captured by the Hispanic variable. For which races are there at least 250 interviewees in the CPS dataset of Hispanic ethnicity? (Select all that apply.)

  • American Indian
  • Asian
  • Black
  • Multiracial
  • Pacific Islander
  • White
table(CPS$Race,CPS$Hispanic)
                  
                       0     1
  American Indian   1129   304
  Asian             6407   113
  Black            13292   621
  Multiracial       2449   448
  Pacific Islander   541    77
  White            89190 16731

Section 2 - Evaluating Missing Values

2.1

Which variables have at least one interviewee with a missing (NA) value? (Select all that apply.)

  • PeopleInHousehold
  • Region
  • State
  • MetroAreaCode
  • Age
  • Married
  • Sex
  • Education
  • Race
  • Hispanic
  • CountryOfBirthCode
  • Citizenship
  • EmploymentStatus
  • Industry
summary(CPS)
 PeopleInHousehold       Region     
 Min.   : 1.000    Midwest  :30684  
 1st Qu.: 2.000    Northeast:25939  
 Median : 3.000    South    :41502  
 Mean   : 3.284    West     :33177  
 3rd Qu.: 4.000                     
 Max.   :15.000                     
                                    
          State       MetroAreaCode        Age       
 California  :11570   Min.   :10420   Min.   : 0.00  
 Texas       : 7077   1st Qu.:21780   1st Qu.:19.00  
 New York    : 5595   Median :34740   Median :39.00  
 Florida     : 5149   Mean   :35075   Mean   :38.83  
 Pennsylvania: 3930   3rd Qu.:41860   3rd Qu.:57.00  
 Illinois    : 3912   Max.   :79600   Max.   :85.00  
 (Other)     :94069   NA's   :34238                  
          Married          Sex       
 Divorced     :11151   Female:67481  
 Married      :55509   Male  :63821  
 Never Married:30772                 
 Separated    : 2027                 
 Widowed      : 6505                 
 NA's         :25338                 
                                     
                   Education    
 High school            :30906  
 Bachelor's degree      :19443  
 Some college, no degree:18863  
 No high school diploma :16095  
 Associate degree       : 9913  
 (Other)                :10744  
 NA's                   :25338  
               Race           Hispanic     
 American Indian :  1433   Min.   :0.0000  
 Asian           :  6520   1st Qu.:0.0000  
 Black           : 13913   Median :0.0000  
 Multiracial     :  2897   Mean   :0.1393  
 Pacific Islander:   618   3rd Qu.:0.0000  
 White           :105921   Max.   :1.0000  
                                           
 CountryOfBirthCode               Citizenship    
 Min.   : 57.00     Citizen, Native     :116639  
 1st Qu.: 57.00     Citizen, Naturalized:  7073  
 Median : 57.00     Non-Citizen         :  7590  
 Mean   : 82.68                                  
 3rd Qu.: 57.00                                  
 Max.   :555.00                                  
                                                 
           EmploymentStatus
 Disabled          : 5712  
 Employed          :61733  
 Not in Labor Force:15246  
 Retired           :18619  
 Unemployed        : 4203  
 NA's              :25789  
                           
                               Industry    
 Educational and health services   :15017  
 Trade                             : 8933  
 Professional and business services: 7519  
 Manufacturing                     : 6791  
 Leisure and hospitality           : 6364  
 (Other)                           :21618  
 NA's                              :65060  

2.2

Often when evaluating a new dataset, we try to identify if there is a pattern in the missing values in the dataset. We will try to determine if there is a pattern in the missing values of the Married variable. The function

is.na(CPS$Married) 

returns a vector of TRUE/FALSE values for whether the Married variable is missing. We can see the breakdown of whether Married is missing based on the reported value of the Region variable with the function

table(CPS$Region, is.na(CPS$Married))

Which is the most accurate:

  • The Married variable being missing is related to the Region value for the interviewee.
  • The Married variable being missing is related to the Sex value for the interviewee.
  • The Married variable being missing is related to the Age value for the interviewee.
  • The Married variable being missing is related to the Citizenship value for the interviewee.
  • The Married variable being missing is not related to the Region, Sex, Age, or Citizenship value for the interviewee.
is.na(CPS$Married) 
   [1] FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE
   [9] FALSE FALSE FALSE FALSE FALSE  TRUE  TRUE FALSE
  [17] FALSE  TRUE FALSE FALSE FALSE FALSE FALSE FALSE
  [25] FALSE FALSE FALSE  TRUE FALSE FALSE FALSE FALSE
  [33] FALSE FALSE  TRUE  TRUE FALSE FALSE FALSE FALSE
  [41] FALSE FALSE FALSE FALSE FALSE FALSE FALSE  TRUE
  [49] FALSE FALSE  TRUE FALSE FALSE FALSE FALSE FALSE
  [57]  TRUE  TRUE FALSE  TRUE  TRUE  TRUE FALSE FALSE
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  [73] FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE
  [81] FALSE FALSE FALSE FALSE  TRUE  TRUE FALSE FALSE
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 [ reached getOption("max.print") -- omitted 130302 entries ]
    table(CPS$Region, is.na(CPS$Married))
           
            FALSE  TRUE
  Midwest   24609  6075
  Northeast 21432  4507
  South     33535  7967
  West      26388  6789

2.3

As mentioned in the variable descriptions, MetroAreaCode is missing if an interviewee does not live in a metropolitan area. Using the same technique as in the previous question, answer the following questions about people who live in non-metropolitan areas.

How many states had all interviewees living in a non-metropolitan area (aka they have a missing MetroAreaCode value)? For this question, treat the District of Columbia as a state (even though it is not technically a state).

table(CPS$State, is.na(CPS$MetroAreaCode))
                      
                       FALSE  TRUE
  Alabama               1020   356
  Alaska                   0  1590
  Arizona               1327   201
  Arkansas               724   697
  California           11333   237
  Colorado              2545   380
  Connecticut           2593   243
  Delaware              1696   518
  District of Columbia  1791     0
  Florida               4947   202
  Georgia               2250   557
  Hawaii                1576   523
  Idaho                  761   757
  Illinois              3473   439
  Indiana               1420   584
  Iowa                  1297  1231
  Kansas                1234   701
  Kentucky               908   933
  Louisiana             1216   234
  Maine                  909  1354
  Maryland              2978   222
  Massachusetts         1858   129
  Michigan              2517   546
  Minnesota             2150   989
  Mississippi            376   854
  Missouri              1440   705
  Montana                199  1015
  Nebraska               816  1133
  Nevada                1609   247
  New Hampshire         1148  1514
  New Jersey            2567     0
  New Mexico             832   270
  New York              5144   451
  North Carolina        1642   977
  North Dakota           432  1213
  Ohio                  2754   924
  Oklahoma              1024   499
  Oregon                1519   424
  Pennsylvania          3245   685
  Rhode Island          2209     0
  South Carolina        1139   519
  South Dakota           595  1405
  Tennessee             1149   635
  Texas                 6060  1017
  Utah                  1455   387
  Vermont                657  1233
  Virginia              2367   586
  Washington            1937   429
  West Virginia          344  1065
  Wisconsin             1882   804
  Wyoming                  0  1624

How many states had all interviewees living in a metropolitan area? Again, treat the District of Columbia as a state.

ANSWER: Three states had all interviewees living in a metropolitan area.

2.4

Which region of the United States has the largest proportion of interviewees living in a non-metropolitan area?

  • Midwest
  • Northeast
  • South
  • West
table(CPS$Region, is.na(CPS$MetroAreaCode))
           
            FALSE  TRUE
  Midwest   20010 10674
  Northeast 20330  5609
  South     31631  9871
  West      25093  8084
10674/(10674+20010)
[1] 0.3478686
5609/(5609+20330)
[1] 0.2162381
9871/(9871+31631)
[1] 0.237844
8084/(8084+25093)
[1] 0.2436628
ANSWER:Midwest
錯誤: 找不到物件 'ANSWER'

2.5

While we were able to use the table() command to compute the proportion of interviewees from each region not living in a metropolitan area, it was somewhat tedious (it involved manually computing the proportion for each region) and isn’t something you would want to do if there were a larger number of options. It turns out there is a less tedious way to compute the proportion of values that are TRUE. The mean() function, which takes the average of the values passed to it, will treat TRUE as 1 and FALSE as 0, meaning it returns the proportion of values that are true. For instance, mean(c(TRUE, FALSE, TRUE, TRUE)) returns 0.75. Knowing this, use tapply() with the mean function to answer the following questions:

Which state has a proportion of interviewees living in a non-metropolitan area closest to 30%?

sort(tapply(is.na(CPS$MetroAreaCode), CPS$State, mean))
District of Columbia           New Jersey 
          0.00000000           0.00000000 
        Rhode Island           California 
          0.00000000           0.02048401 
             Florida        Massachusetts 
          0.03923092           0.06492199 
            Maryland             New York 
          0.06937500           0.08060769 
         Connecticut             Illinois 
          0.08568406           0.11221881 
            Colorado              Arizona 
          0.12991453           0.13154450 
              Nevada                Texas 
          0.13308190           0.14370496 
           Louisiana         Pennsylvania 
          0.16137931           0.17430025 
            Michigan           Washington 
          0.17825661           0.18131868 
             Georgia             Virginia 
          0.19843249           0.19844226 
                Utah               Oregon 
          0.21009772           0.21821925 
            Delaware           New Mexico 
          0.23396567           0.24500907 
              Hawaii                 Ohio 
          0.24916627           0.25122349 
             Alabama              Indiana 
          0.25872093           0.29141717 
           Wisconsin       South Carolina 
          0.29932986           0.31302774 
           Minnesota             Oklahoma 
          0.31506849           0.32764281 
            Missouri            Tennessee 
          0.32867133           0.35594170 
              Kansas       North Carolina 
          0.36227390           0.37304315 
                Iowa             Arkansas 
          0.48694620           0.49049965 
               Idaho             Kentucky 
          0.49868248           0.50678979 
       New Hampshire             Nebraska 
          0.56874530           0.58132376 
               Maine              Vermont 
          0.59832081           0.65238095 
         Mississippi         South Dakota 
          0.69430894           0.70250000 
        North Dakota        West Virginia 
          0.73738602           0.75585522 
             Montana               Alaska 
          0.83607908           1.00000000 
             Wyoming 
          1.00000000 

Which state has the largest proportion of non-metropolitan interviewees, ignoring states where all interviewees were non-metropolitan?

Montana
錯誤: 找不到物件 'Montana'

Section 3 - Integrating Metropolitan Area Data

Codes like MetroAreaCode and CountryOfBirthCode are a compact way to encode factor variables with text as their possible values, and they are therefore quite common in survey datasets. In fact, all but one of the variables in this dataset were actually stored by a numeric code in the original CPS datafile.

When analyzing a variable stored by a numeric code, we will often want to convert it into the values the codes represent. To do this, we will use a dictionary, which maps the the code to the actual value of the variable. We have provided dictionaries MetroAreaCodes.csv and CountryCodes.csv, which respectively map MetroAreaCode and CountryOfBirthCode into their true values. Read these two dictionaries into data frames MetroAreaMap and CountryMap.

3.1

How many observations (codes for metropolitan areas) are there in MetroAreaMap?

MetroAreaMap = read.csv("Unit1/MetroAreaCodes.csv")
CountryMap = read.csv("Unit1/CountryCodes.csv")
str(MetroAreaMap)
'data.frame':   271 obs. of  2 variables:
 $ Code     : int  460 3000 3160 3610 3720 6450 10420 10500 10580 10740 ...
 $ MetroArea: Factor w/ 271 levels "Akron, OH","Albany-Schenectady-Troy, NY",..: 12 92 97 117 122 195 1 3 2 4 ...

How many observations (codes for countries) are there in CountryMap?

str(CountryMap)
'data.frame':   149 obs. of  2 variables:
 $ Code   : int  57 66 73 78 96 100 102 103 104 105 ...
 $ Country: Factor w/ 149 levels "Afghanistan",..: 139 57 105 135 97 3 11 18 24 37 ...

3.2

To merge in the metropolitan areas, we want to connect the field MetroAreaCode from the CPS data frame with the field Code in MetroAreaMap. The following command merges the two data frames on these columns, overwriting the CPS data frame with the result:

CPS = merge(CPS, MetroAreaMap, by.x="MetroAreaCode", by.y="Code", all.x=TRUE)

The first two arguments determine the data frames to be merged (they are called “x” and “y”, respectively, in the subsequent parameters to the merge function). by.x=“MetroAreaCode” means we’re matching on the MetroAreaCode variable from the “x” data frame (CPS), while by.y=“Code” means we’re matching on the Code variable from the “y” data frame (MetroAreaMap). Finally, all.x=TRUE means we want to keep all rows from the “x” data frame (CPS), even if some of the rows’ MetroAreaCode doesn’t match any codes in MetroAreaMap (for those familiar with database terminology, this parameter makes the operation a left outer join instead of an inner join).

Review the new version of the CPS data frame with the summary() and str() functions. What is the name of the variable that was added to the data frame by the merge() operation?

summary(CPS)
 MetroAreaCode   PeopleInHousehold       Region     
 Min.   :10420   Min.   : 1.000    Midwest  :30684  
 1st Qu.:21780   1st Qu.: 2.000    Northeast:25939  
 Median :34740   Median : 3.000    South    :41502  
 Mean   :35075   Mean   : 3.284    West     :33177  
 3rd Qu.:41860   3rd Qu.: 4.000                     
 Max.   :79600   Max.   :15.000                     
 NA's   :34238                                      
          State            Age       
 California  :11570   Min.   : 0.00  
 Texas       : 7077   1st Qu.:19.00  
 New York    : 5595   Median :39.00  
 Florida     : 5149   Mean   :38.83  
 Pennsylvania: 3930   3rd Qu.:57.00  
 Illinois    : 3912   Max.   :85.00  
 (Other)     :94069                  
          Married          Sex       
 Divorced     :11151   Female:67481  
 Married      :55509   Male  :63821  
 Never Married:30772                 
 Separated    : 2027                 
 Widowed      : 6505                 
 NA's         :25338                 
                                     
                   Education    
 High school            :30906  
 Bachelor's degree      :19443  
 Some college, no degree:18863  
 No high school diploma :16095  
 Associate degree       : 9913  
 (Other)                :10744  
 NA's                   :25338  
               Race           Hispanic     
 American Indian :  1433   Min.   :0.0000  
 Asian           :  6520   1st Qu.:0.0000  
 Black           : 13913   Median :0.0000  
 Multiracial     :  2897   Mean   :0.1393  
 Pacific Islander:   618   3rd Qu.:0.0000  
 White           :105921   Max.   :1.0000  
                                           
 CountryOfBirthCode               Citizenship    
 Min.   : 57.00     Citizen, Native     :116639  
 1st Qu.: 57.00     Citizen, Naturalized:  7073  
 Median : 57.00     Non-Citizen         :  7590  
 Mean   : 82.68                                  
 3rd Qu.: 57.00                                  
 Max.   :555.00                                  
                                                 
           EmploymentStatus
 Disabled          : 5712  
 Employed          :61733  
 Not in Labor Force:15246  
 Retired           :18619  
 Unemployed        : 4203  
 NA's              :25789  
                           
                               Industry    
 Educational and health services   :15017  
 Trade                             : 8933  
 Professional and business services: 7519  
 Manufacturing                     : 6791  
 Leisure and hospitality           : 6364  
 (Other)                           :21618  
 NA's                              :65060  
                                              MetroArea    
 New York-Northern New Jersey-Long Island, NY-NJ-PA: 5409  
 Washington-Arlington-Alexandria, DC-VA-MD-WV      : 4177  
 Los Angeles-Long Beach-Santa Ana, CA              : 4102  
 Philadelphia-Camden-Wilmington, PA-NJ-DE          : 2855  
 Chicago-Naperville-Joliet, IN-IN-WI               : 2772  
 (Other)                                           :77749  
 NA's                                              :34238  
str(CPS)
'data.frame':   131302 obs. of  15 variables:
 $ MetroAreaCode     : int  10420 10420 10420 10420 10420 10420 10420 10420 10420 10420 ...
 $ PeopleInHousehold : int  4 4 2 4 1 3 4 4 2 3 ...
 $ Region            : Factor w/ 4 levels "Midwest","Northeast",..: 1 1 1 1 1 1 1 1 1 1 ...
 $ State             : Factor w/ 51 levels "Alabama","Alaska",..: 36 36 36 36 36 36 36 36 36 36 ...
 $ Age               : int  2 9 73 40 63 19 30 6 60 32 ...
 $ Married           : Factor w/ 5 levels "Divorced","Married",..: NA NA 2 2 3 3 2 NA 2 2 ...
 $ Sex               : Factor w/ 2 levels "Female","Male": 2 2 1 1 2 1 1 1 1 2 ...
 $ Education         : Factor w/ 8 levels "Associate degree",..: NA NA 8 4 6 4 2 NA 4 4 ...
 $ Race              : Factor w/ 6 levels "American Indian",..: 6 6 6 6 6 6 2 6 6 6 ...
 $ Hispanic          : int  0 0 0 0 0 0 0 1 0 0 ...
 $ CountryOfBirthCode: int  57 57 57 362 57 57 203 57 57 57 ...
 $ Citizenship       : Factor w/ 3 levels "Citizen, Native",..: 1 1 1 2 1 1 3 1 1 1 ...
 $ EmploymentStatus  : Factor w/ 5 levels "Disabled","Employed",..: NA NA 4 3 1 2 3 NA 2 2 ...
 $ Industry          : Factor w/ 14 levels "Agriculture, forestry, fishing, and hunting",..: NA NA NA NA NA 7 NA NA 4 13 ...
 $ MetroArea         : Factor w/ 271 levels "Akron, OH","Albany-Schenectady-Troy, NY",..: 1 1 1 1 1 1 1 1 1 1 ...

How many interviewees have a missing value for the new metropolitan area variable? Note that all of these interviewees would have been removed from the merged data frame if we did not include the all.x=TRUE parameter.

summary(CPS)
 MetroAreaCode   PeopleInHousehold       Region     
 Min.   :10420   Min.   : 1.000    Midwest  :30684  
 1st Qu.:21780   1st Qu.: 2.000    Northeast:25939  
 Median :34740   Median : 3.000    South    :41502  
 Mean   :35075   Mean   : 3.284    West     :33177  
 3rd Qu.:41860   3rd Qu.: 4.000                     
 Max.   :79600   Max.   :15.000                     
 NA's   :34238                                      
          State            Age       
 California  :11570   Min.   : 0.00  
 Texas       : 7077   1st Qu.:19.00  
 New York    : 5595   Median :39.00  
 Florida     : 5149   Mean   :38.83  
 Pennsylvania: 3930   3rd Qu.:57.00  
 Illinois    : 3912   Max.   :85.00  
 (Other)     :94069                  
          Married          Sex       
 Divorced     :11151   Female:67481  
 Married      :55509   Male  :63821  
 Never Married:30772                 
 Separated    : 2027                 
 Widowed      : 6505                 
 NA's         :25338                 
                                     
                   Education    
 High school            :30906  
 Bachelor's degree      :19443  
 Some college, no degree:18863  
 No high school diploma :16095  
 Associate degree       : 9913  
 (Other)                :10744  
 NA's                   :25338  
               Race           Hispanic     
 American Indian :  1433   Min.   :0.0000  
 Asian           :  6520   1st Qu.:0.0000  
 Black           : 13913   Median :0.0000  
 Multiracial     :  2897   Mean   :0.1393  
 Pacific Islander:   618   3rd Qu.:0.0000  
 White           :105921   Max.   :1.0000  
                                           
 CountryOfBirthCode               Citizenship    
 Min.   : 57.00     Citizen, Native     :116639  
 1st Qu.: 57.00     Citizen, Naturalized:  7073  
 Median : 57.00     Non-Citizen         :  7590  
 Mean   : 82.68                                  
 3rd Qu.: 57.00                                  
 Max.   :555.00                                  
                                                 
           EmploymentStatus
 Disabled          : 5712  
 Employed          :61733  
 Not in Labor Force:15246  
 Retired           :18619  
 Unemployed        : 4203  
 NA's              :25789  
                           
                               Industry    
 Educational and health services   :15017  
 Trade                             : 8933  
 Professional and business services: 7519  
 Manufacturing                     : 6791  
 Leisure and hospitality           : 6364  
 (Other)                           :21618  
 NA's                              :65060  
                                              MetroArea    
 New York-Northern New Jersey-Long Island, NY-NJ-PA: 5409  
 Washington-Arlington-Alexandria, DC-VA-MD-WV      : 4177  
 Los Angeles-Long Beach-Santa Ana, CA              : 4102  
 Philadelphia-Camden-Wilmington, PA-NJ-DE          : 2855  
 Chicago-Naperville-Joliet, IN-IN-WI               : 2772  
 (Other)                                           :77749  
 NA's                                              :34238  

3.3

Which of the following metropolitan areas has the largest number of interviewees?

  • Atlanta-Sandy Springs-Marietta, GA
  • Baltimore-Towson, MD
  • Boston-Cambridge-Quincy, MA-NH
  • San Francisco-Oakland-Fremont, CA
sort(table(CPS$MetroArea))

                       Appleton-Oshkosh-Neenah, WI 
                                                 0 
                 Grand Rapids-Muskegon-Holland, MI 
                                                 0 
               Greenville-Spartanburg-Anderson, SC 
                                                 0 
                       Hinesville-Fort Stewart, GA 
                                                 0 
                                     Jamestown, NY 
                                                 0 
                        Kalamazoo-Battle Creek, MI 
                                                 0 
                       Portsmouth-Rochester, NH-ME 
                                                 0 
                                 Bowling Green, KY 
                                                29 
                                    Ocean City, NJ 
                                                30 
                                   Springfield, OH 
                                                34 
                             Bloomington-Normal IL 
                                                40 
                                      Valdosta, GA 
                                                42 
                                 Warner Robins, GA 
                                                42 
                                   Tallahassee, FL 
                                                43 
                                      Columbia, MO 
                                                47 
                                   Punta Gorda, FL 
                                                48 
                                       Midland, TX 
                                                51 
                           Niles-Benton Harbor, MI 
                                                51 
                                  Johnson City, TN 
                                                52 
                                      Santa Fe, NM 
                                                52 
                                      Prescott, AZ 
                                                54 
                  Vineland-Millville-Bridgeton, NJ 
                                                54 
                     Hickory-Morgantown-Lenoir, NC 
                                                57 
                                        Madera, CA 
                                                57 
                                   Columbus, GA-AL 
                                                59 
                                        Joplin, MO 
                                                59 
                        Panama City-Lynn Haven, FL 
                                                59 
                                         Chico, CA 
                                                60 
                               Anniston-Oxford, AL 
                                                61 
                                          Napa, CA 
                                                61 
                                      Anderson, IN 
                                                62 
                                      Florence, AL 
                                                63 
                                  Jacksonville, NC 
                                                63 
                                     Johnstown, PA 
                                                63 
                                       Lubbock, TX 
                                                63 
                                        Monroe, MI 
                                                63 
                                      Anderson, SC 
                                                64 
                                    Farmington, NM 
                                                64 
                           Athens-Clark County, GA 
                                                65 
                               Gulfport-Biloxi, MS 
                                                65 
                                      Longview, TX 
                                                65 
                                         Macon, GA 
                                                65 
                  Leominster-Fitchburg-Gardner, MA 
                                                66 
                                       Roanoke, VA 
                                                66 
                        Santa-Cruz-Watsonville, CA 
                                                66 
                          Kingsport-Bristol, TN-VA 
                                                67 
                                        Albany, GA 
                                                68 
                                    Bellingham, WA 
                                                70 
                                   Gainesville, FL 
                                                70 
                                       Jackson, MI 
                                                70 
                                    Binghamton, NY 
                                                73 
                                     Lynchburg, VA 
                                                73 
                Saginaw-Saginaw Township North, MI 
                                                74 
                                     Salisbury, MD 
                                                74 
                               Barnstable Town, MA 
                                                75 
                                         Ocala, FL 
                                                76 
                                   Springfield, IL 
                                                76 
                                  Fayetteville, NC 
                                                77 
                        Michigan City-La Porte, IN 
                                                77 
                   San Luis Obispo-Paso Robles, CA 
                                                77 
                           Holland-Grand Haven, MI 
                                                78 
                                    Tuscaloosa, AL 
                                                78 
                         Brownsville-Harlingen, TX 
                                                79 
                                    Vero Beach, FL 
                                                79 
                                          Waco, TX 
                                                79 
            Fort Walton Beach-Crestview-Destin, FL 
                                                80 
                                    Utica-Rome, NY 
                                                80 
                                       Decatur, IL 
                                                81 
                                  Lake Charles, LA 
                                                81 
                       South Bend-Mishawaka, IN-MI 
                                                81 
                                       Altoona, PA 
                                                82 
                      Huntington-Ashland, WV-KY-OH 
                                                82 
                                       Medford, OR 
                                                82 
                           Naples-Marco Island, FL 
                                                82 
                                     St. Cloud, MN 
                                                82 
                                     Ann Arbor, MI 
                                                85 
                                Oshkosh-Neenah, WI 
                                                85 
                     Hagerstown-Martinsburg, MD-WV 
                                                86 
                          Bremerton-Silverdale, WA 
                                                87 
                                          Erie, PA 
                                                87 
                              Kankakee-Bradley, IL 
                                                87 
                                      Kingston, NY 
                                                87 
                                      Amarillo, TX 
                                                88 
                                        Laredo, TX 
                                                89 
                                  Harrisonburg, VA 
                                                90 
                        Muskegon-Norton Shores, MI 
                                                90 
                                 Trenton-Ewing, NJ 
                                                91 
                                       Decatur, Al 
                                                96 
                                        Wausau, WI 
                                                96 
                                        Lawton, OK 
                                                97 
                                      Lawrence, KS 
                                                98 
                                     El Centro, CA 
                                                99 
                                 Evansville, IN-KY 
                                                99 
                                    Janesville, WI 
                                                99 
                                       Olympia, WA 
                                                99 
                                   Spartanburg, SC 
                                                99 
                      Killeen-Temple-Fort Hood, TX 
                                               101 
                                         Flint, MI 
                                               102 
        Myrtle Beach-Conway-North Myrtle Beach, SC 
                                               102 
                                    Montgomery, AL 
                                               103 
                                   Bloomington, IN 
                                               104 
                                       Salinas, CA 
                                               104 
                                 Fort Smith, AR-OK 
                                               105 
                                        Merced, CA 
                                               106 
                                    Las Cruses, NM 
                                               107 
                    Pensacola-Ferry Pass-Brent, FL 
                                               107 
                    Port St. Lucie-Fort Pierce, FL 
                                               109 
                                    Eau Claire, WI 
                                               110 
                                        Mobile, AL 
                                               110 
                                 Atlantic City, NJ 
                                               111 
                                       Danbury, CT 
                                               112 
                                        Peoria, IL 
                                               112 
                                        Yakima, WA 
                                               112 
                                     La Crosse, WI 
                                               114 
                                      Rockford, IL 
                                               114 
                                     Asheville, NC 
                                               116 
                                      Victoria, TX 
                                               116 
                                 Coeur d'Alene, ID 
                                               117 
                                    Huntsville, AL 
                                               117 
                                  York-Hanover, PA 
                                               117 
                              Canton-Massillon, OH 
                                               118 
                          Lansing-East Lansing, MI 
                                               119 
                                        Racine, WI 
                                               119 
                           Visalia-Porterville, CA 
                                               121 
                              Champaign-Urbana, IL 
                                               122 
                          Beaumont-Port Author, TX 
                                               123 
                                       Appleton,WI 
                                               125 
                                     Duluth, MN-WI 
                                               126 
                             Kalamazoo-Portage, MI 
                                               127 
                                 Winston-Salem, NC 
                                               127 
                           Santa Rosa-Petaluma, CA 
                                               129 
                                        Pueblo, CO 
                                               130 
                                     Iowa City, IA 
                                               131 
                                Corpus Christi, TX 
                                               132 
              Santa Barbara-Santa Maria-Goleta, CA 
                                               132 
                             Vallejo-Fairfield, CA 
                                               133 
                                    Fort Wayne, IN 
                                               136 
                                     Green Bay, WI 
                                               136 
                                          Bend, OR 
                                               140 
            Deltona-Daytona Beach-Ormond Beach, FL 
                                               140 
                                       Reading, PA 
                                               142 
                                  Worcester, MA-CT 
                                               144 
                         Cape Coral-Fort Myers, FL 
                                               146 
                       Shreveport-Bossier City, LA 
                                               146 
                         Lakeland-Winter Haven, FL 
                                               149 
                    Youngstown-Warren-Boardman, OH 
                                               153 
                                Springfield, MA-CT 
                                               155 
                                     Lancaster, PA 
                                               156 
                                       Spokane, WA 
                                               156 
                          Waterloo-Cedar Falls, IA 
                                               156 
                                     Waterbury, CT 
                                               157 
                                       Modesto, CA 
                                               158 
                    Augusta-Richmond County, GA-SC 
                                               161 
                                   Springfield, MO 
                                               161 
                                       Greeley, CO 
                                               162 
                                Chattanooga, TN-GA 
                                               167 
                                     Knoxville, TN 
                                               168 
                 Palm Bay-Melbourne-Titusville, FL 
                                               168 
                                         Salem, OR 
                                               170 
                                       Boulder, CO 
                                               171 
                           Harrisburg-Carlisle, PA 
                                               174 
                         Scranton-Wilkes Barre, PA 
                                               176 
                                        Monroe, LA 
                                               179 
                                     Lafayette, LA 
                                               181 
                                        Topeka, KS 
                                               182 
                                    Greenville, SC 
                                               185 
                                        Durham, NC 
                                               189 
                     Sarasota-Bradenton-Venice, FL 
                                               192 
                                      Stockton, CA 
                                               193 
                        McAllen-Edinburg-Pharr, TX 
                                               195 
                                  Cedar Rapids, IA 
                                               196 
                            Eugene-Springfield, OR 
                                               196 
                             Lexington-Fayette, KY 
                                               198 
                                      Billings, MT 
                                               199 
              Poughkeepsie-Newburgh-Middletown, NY 
                                               201 
                                      Savannah, GA 
                                               202 
                         Norwich-New London, CT-RI 
                                               203 
                         Fort Collins-Loveland, CO 
                                               206 
                                        Bangor, ME 
                                               208 
             Fayetteville-Springdale-Rogers, AR-MO 
                                               215 
                                       Jackson, MS 
                                               222 
                                      Syracuse, NY 
                                               223 
                                         Akron, OH 
                                               231 
                   Charleston-North Charleston, SC 
                                               232 
                                        Toledo, OH 
                                               235 
               Davenport-Moline-Rock Island, IA-IL 
                                               240 
                                       El Paso, TX 
                                               244 
                                   Bakersfield, CA 
                                               245 
                         Greensboro-High Point, NC 
                                               251 
                                   Baton Rouge, LA 
                                               262 
                                    Charleston, WV 
                                               262 
                            Rochester-Dover, NH-ME 
                                               262 
                  Oxnard-Thousand Oaks-Ventura, CA 
                                               267 
                       Albany-Schenectady-Troy, NY 
                                               268 
                                        Dayton, OH 
                                               268 
                                       Madison, WI 
                                               284 
                                      Columbia, SC 
                                               291 
                                        Tucson, AZ 
                                               302 
                                        Fresno, CA 
                                               303 
                          Grand Rapids-Wyoming, MI 
                                               304 
                                     Rochester, NY 
                                               307 
                                    Provo-Orem, UT 
                                               309 
                                   Reno-Sparks, NV 
                                               310 
                                         Tulsa, OK 
                                               323 
                 Allentown-Bethlehem-Easton, PA-NJ 
                                               334 
                                  Raleigh-Cary, NC 
                                               336 
                         Buffalo-Niagara Falls, NY 
                                               344 
                                 Memphis, TN-MS-AR 
                                               348 
                   New Orleans-Metairie-Kenner, LA 
                                               367 
                              Colorado Springs, CO 
                                               372 
                             Birmingham-Hoover, AL 
                                               392 
                                  Jacksonville, FL 
                                               393 
                 Little Rock-North Little Rock, AR 
                                               404 
                              Ogden-Clearfield, UT 
                                               423 
                                       Wichita, KS 
                                               427 
                                      Fargo, ND-MN 
                                               432 
                                         Dover, DE 
                                               456 
                                      Richmond, VA 
                                               490 
                                    Des Moines, IA 
                                               501 
               Nashville-Davidson-Murfreesboro, TN 
                                               505 
                                     New Haven, CT 
                                               506 
                             Austin-Round Rock, TX 
                                               516 
                 Charlotte-Gastonia-Concord, NC-SC 
                                               517 
                                 Louisville, KY-IN 
                                               519 
                                      Columbus, OH 
                                               551 
                                  Indianapolis, IN 
                                               570 
                                   Sioux Falls, SD 
                                               595 
        Virginia Beach-Norfolk-Newport News, VA-NC 
                                               597 
                                 Oklahoma City, OK 
                                               604 
                                   San Antonio, TX 
                                               607 
                                   Albuquerque, NM 
                                               609 
                                       Orlando, FL 
                                               610 
                              Boise City-Nampa, ID 
                                               644 
                   Burlington-South Burlington, VT 
                                               657 
             Sacramento-Arden-Arcade-Roseville, CA 
                                               667 
                San Jose-Sunnyvale-Santa Clara, CA 
                                               670 
                       Cleveland-Elyria-Mentor, OH 
                                               681 
                       Portland-South Portland, ME 
                                               701 
                 Milwaukee-Waukesha-West Allis, WI 
                                               714 
                   Cincinnati-Middletown, OH-KY-IN 
                                               719 
                                Salt Lake City, UT 
                                               723 
                   Bridgeport-Stamford-Norwalk, CT 
                                               730 
                                    Pittsburgh, PA 
                                               732 
               Tampa-St. Petersburg-Clearwater, FL 
                                               842 
          Hartford-West Hartford-East Hartford, CT 
                                               885 
                 San Diego-Carlsbad-San Marcos, CA 
                                               907 
                                  St. Louis, MO-IL 
                                               956 
                       Omaha-Council Bluffs, NE-IA 
                                               957 
                                Kansas City, MO-KS 
                                               962 
                       Phoenix-Mesa-Scottsdale, AZ 
                                               971 
               Portland-Vancouver-Beaverton, OR-WA 
                                              1089 
                       Seattle-Tacoma-Bellevue, WA 
                                              1255 
                      Riverside-San Bernardino, CA 
                                              1290 
                            Las Vegas-Paradise, NV 
                                              1299 
                        Detroit-Warren-Livonia, MI 
                                              1354 
                 San Francisco-Oakland-Fremont, CA 
                                              1386 
                              Baltimore-Towson, MD 
                                              1483 
                                 Denver-Aurora, CO 
                                              1504 
                Atlanta-Sandy Springs-Marietta, GA 
                                              1552 
             Miami-Fort Lauderdale-Miami Beach, FL 
                                              1554 
                                      Honolulu, HI 
                                              1576 
                    Houston-Baytown-Sugar Land, TX 
                                              1649 
                   Dallas-Fort Worth-Arlington, TX 
                                              1863 
            Minneapolis-St Paul-Bloomington, MN-WI 
                                              1942 
                    Boston-Cambridge-Quincy, MA-NH 
                                              2229 
              Providence-Fall River-Warwick, MA-RI 
                                              2284 
               Chicago-Naperville-Joliet, IN-IN-WI 
                                              2772 
          Philadelphia-Camden-Wilmington, PA-NJ-DE 
                                              2855 
              Los Angeles-Long Beach-Santa Ana, CA 
                                              4102 
      Washington-Arlington-Alexandria, DC-VA-MD-WV 
                                              4177 
New York-Northern New Jersey-Long Island, NY-NJ-PA 
                                              5409 

3.4

Which metropolitan area has the highest proportion of interviewees of Hispanic ethnicity? Hint: Use tapply() with mean, as in the previous subproblem. Calling sort() on the output of tapply() could also be helpful here.

sort(tapply(CPS$Hispanic,CPS$MetroArea,mean))
                                      Anderson, SC 
                                       0.000000000 
                                     Ann Arbor, MI 
                                       0.000000000 
                               Barnstable Town, MA 
                                       0.000000000 
                             Bloomington-Normal IL 
                                       0.000000000 
                                   Bloomington, IN 
                                       0.000000000 
                                 Bowling Green, KY 
                                       0.000000000 
                                       Decatur, IL 
                                       0.000000000 
                                    Eau Claire, WI 
                                       0.000000000 
                                      Florence, AL 
                                       0.000000000 
                     Hagerstown-Martinsburg, MD-WV 
                                       0.000000000 
                                  Harrisonburg, VA 
                                       0.000000000 
                      Huntington-Ashland, WV-KY-OH 
                                       0.000000000 
                                    Huntsville, AL 
                                       0.000000000 
                                       Jackson, MI 
                                       0.000000000 
                                     Johnstown, PA 
                                       0.000000000 
                                         Macon, GA 
                                       0.000000000 
                                        Mobile, AL 
                                       0.000000000 
                                     Salisbury, MD 
                                       0.000000000 
                                      Savannah, GA 
                                       0.000000000 
                                 Warner Robins, GA 
                                       0.000000000 
                                        Dayton, OH 
                                       0.003731343 
                                        Monroe, LA 
                                       0.005586592 
                                     Knoxville, TN 
                                       0.005952381 
                                    Charleston, WV 
                                       0.007633588 
                                       Appleton,WI 
                                       0.008000000 
                                       Jackson, MS 
                                       0.009009009 
                   Burlington-South Burlington, VT 
                                       0.009132420 
                                    Montgomery, AL 
                                       0.009708738 
                                        Wausau, WI 
                                       0.010416667 
                       Portland-South Portland, ME 
                                       0.011412268 
                                Oshkosh-Neenah, WI 
                                       0.011764706 
                                       Altoona, PA 
                                       0.012195122 
                                     St. Cloud, MN 
                                       0.012195122 
                           Holland-Grand Haven, MI 
                                       0.012820513 
                                         Akron, OH 
                                       0.012987013 
                                   Springfield, IL 
                                       0.013157895 
                                    Bellingham, WA 
                                       0.014285714 
                                        Bangor, ME 
                                       0.014423077 
                          Kingsport-Bristol, TN-VA 
                                       0.014925373 
                                  Cedar Rapids, IA 
                                       0.015306122 
                               Gulfport-Biloxi, MS 
                                       0.015384615 
                                     Duluth, MN-WI 
                                       0.015873016 
                                    Pittsburgh, PA 
                                       0.016393443 
                                        Joplin, MO 
                                       0.016949153 
                   Charleston-North Charleston, SC 
                                       0.017241379 
                         Buffalo-Niagara Falls, NY 
                                       0.017441860 
                                     La Crosse, WI 
                                       0.017543860 
                           Niles-Benton Harbor, MI 
                                       0.019607843 
                                 Evansville, IN-KY 
                                       0.020202020 
                                   Spartanburg, SC 
                                       0.020202020 
                                          Bend, OR 
                                       0.021428571 
                        Muskegon-Norton Shores, MI 
                                       0.022222222 
                                          Erie, PA 
                                       0.022988506 
                           Harrisburg-Carlisle, PA 
                                       0.022988506 
                                       Madison, WI 
                                       0.024647887 
                                  Lake Charles, LA 
                                       0.024691358 
                                      Fargo, ND-MN 
                                       0.025462963 
                                 Coeur d'Alene, ID 
                                       0.025641026 
                                       Spokane, WA 
                                       0.025641026 
                Saginaw-Saginaw Township North, MI 
                                       0.027027027 
                                     Lynchburg, VA 
                                       0.027397260 
                    Pensacola-Ferry Pass-Brent, FL 
                                       0.028037383 
                                 Memphis, TN-MS-AR 
                                       0.028735632 
                                   Springfield, OH 
                                       0.029411765 
                                      Billings, MT 
                                       0.030150754 
                                    Janesville, WI 
                                       0.030303030 
                                       Roanoke, VA 
                                       0.030303030 
                                  St. Louis, MO-IL 
                                       0.030334728 
                                     Iowa City, IA 
                                       0.030534351 
                            Rochester-Dover, NH-ME 
                                       0.030534351 
                             Kalamazoo-Portage, MI 
                                       0.031496063 
                    Youngstown-Warren-Boardman, OH 
                                       0.032679739 
                              Champaign-Urbana, IL 
                                       0.032786885 
                                        Toledo, OH 
                                       0.034042553 
                                    Fort Wayne, IN 
                                       0.036764706 
                 Little Rock-North Little Rock, AR 
                                       0.037128713 
                        Detroit-Warren-Livonia, MI 
                                       0.037666174 
                                    Greenville, SC 
                                       0.037837838 
                                   Baton Rouge, LA 
                                       0.038167939 
                                  Johnson City, TN 
                                       0.038461538 
                                 Louisville, KY-IN 
                                       0.038535645 
                        Michigan City-La Porte, IN 
                                       0.038961039 
                                         Flint, MI 
                                       0.039215686 
                   Cincinnati-Middletown, OH-KY-IN 
                                       0.040333797 
                             Lexington-Fayette, KY 
                                       0.040404040 
                                      Lawrence, KS 
                                       0.040816327 
                       Albany-Schenectady-Troy, NY 
                                       0.041044776 
                                    Binghamton, NY 
                                       0.041095890 
                                   Punta Gorda, FL 
                                       0.041666667 
                                   Sioux Falls, SD 
                                       0.042016807 
                                      Columbia, MO 
                                       0.042553191 
                                  York-Hanover, PA 
                                       0.042735043 
                                   Gainesville, FL 
                                       0.042857143 
                                      Richmond, VA 
                                       0.042857143 
                                   Springfield, MO 
                                       0.043478261 
                                      Columbus, OH 
                                       0.043557169 
                                      Rockford, IL 
                                       0.043859649 
                                        Albany, GA 
                                       0.044117647 
                     Sarasota-Bradenton-Venice, FL 
                                       0.046875000 
                                      Valdosta, GA 
                                       0.047619048 
                               Anniston-Oxford, AL 
                                       0.049180328 
                       South Bend-Mishawaka, IN-MI 
                                       0.049382716 
        Virginia Beach-Norfolk-Newport News, VA-NC 
                                       0.050251256 
            Minneapolis-St Paul-Bloomington, MN-WI 
                                       0.052008239 
                                       Decatur, Al 
                                       0.052083333 
                             Birmingham-Hoover, AL 
                                       0.053571429 
                 Palm Bay-Melbourne-Titusville, FL 
                                       0.053571429 
                                 Winston-Salem, NC 
                                       0.055118110 
                                         Dover, DE 
                                       0.057017544 
                          Bremerton-Silverdale, WA 
                                       0.057471264 
                                     Rochester, NY 
                                       0.058631922 
        Myrtle Beach-Conway-North Myrtle Beach, SC 
                                       0.058823529 
                                        Racine, WI 
                                       0.058823529 
                                      Honolulu, HI 
                                       0.059644670 
                       Cleveland-Elyria-Mentor, OH 
                                       0.060205580 
                                     Asheville, NC 
                                       0.060344828 
                                     Lafayette, LA 
                                       0.060773481 
                                        Peoria, IL 
                                       0.062500000 
                                        Monroe, MI 
                                       0.063492063 
                                      Anderson, IN 
                                       0.064516129 
                                    Provo-Orem, UT 
                                       0.064724919 
                                    Ocean City, NJ 
                                       0.066666667 
                        Panama City-Lynn Haven, FL 
                                       0.067796610 
                                      Kingston, NY 
                                       0.068965517 
               Nashville-Davidson-Murfreesboro, TN 
                                       0.069306931 
                    Boston-Cambridge-Quincy, MA-NH 
                                       0.069537909 
                                   Tallahassee, FL 
                                       0.069767442 
                       Omaha-Council Bluffs, NE-IA 
                                       0.070010449 
                                  Indianapolis, IN 
                                       0.071929825 
                                     New Haven, CT 
                                       0.073122530 
                                    Des Moines, IA 
                                       0.073852295 
                                    Utica-Rome, NY 
                                       0.075000000 
                         Greensboro-High Point, NC 
                                       0.075697211 
                                    Vero Beach, FL 
                                       0.075949367 
                              Canton-Massillon, OH 
                                       0.076271186 
                            Eugene-Springfield, OR 
                                       0.076530612 
                                Chattanooga, TN-GA 
                                       0.077844311 
          Philadelphia-Camden-Wilmington, PA-NJ-DE 
                                       0.078458844 
                                      Columbia, SC 
                                       0.079037801 
                                      Syracuse, NY 
                                       0.080717489 
                       Shreveport-Bossier City, LA 
                                       0.082191781 
                              Baltimore-Towson, MD 
                                       0.082265678 
                                  Worcester, MA-CT 
                                       0.083333333 
                          Lansing-East Lansing, MI 
                                       0.084033613 
                                       Medford, OR 
                                       0.085365854 
                 Milwaukee-Waukesha-West Allis, WI 
                                       0.085434174 
                Atlanta-Sandy Springs-Marietta, GA 
                                       0.085695876 
                                 Fort Smith, AR-OK 
                                       0.085714286 
                 Allentown-Bethlehem-Easton, PA-NJ 
                                       0.086826347 
                     Hickory-Morgantown-Lenoir, NC 
                                       0.087719298 
                       Seattle-Tacoma-Bellevue, WA 
                                       0.088446215 
                                 Atlantic City, NJ 
                                       0.090090090 
                  Leominster-Fitchburg-Gardner, MA 
                                       0.090909091 
                                  Jacksonville, FL 
                                       0.091603053 
               Davenport-Moline-Rock Island, IA-IL 
                                       0.091666667 
                    Augusta-Richmond County, GA-SC 
                                       0.093167702 
                              Boise City-Nampa, ID 
                                       0.093167702 
                                        Topeka, KS 
                                       0.093406593 
               Portland-Vancouver-Beaverton, OR-WA 
                                       0.094582185 
            Deltona-Daytona Beach-Ormond Beach, FL 
                                       0.100000000 
                    Port St. Lucie-Fort Pierce, FL 
                                       0.100917431 
                                     Lancaster, PA 
                                       0.102564103 
                                    Tuscaloosa, AL 
                                       0.102564103 
                         Norwich-New London, CT-RI 
                                       0.103448276 
          Hartford-West Hartford-East Hartford, CT 
                                       0.105084746 
                                 Oklahoma City, OK 
                                       0.107615894 
                          Waterloo-Cedar Falls, IA 
                                       0.108974359 
                                        Durham, NC 
                                       0.111111111 
                   New Orleans-Metairie-Kenner, LA 
                                       0.111716621 
                   Bridgeport-Stamford-Norwalk, CT 
                                       0.112328767 
            Fort Walton Beach-Crestview-Destin, FL 
                                       0.112500000 
              Providence-Fall River-Warwick, MA-RI 
                                       0.114273205 
                                         Tulsa, OK 
                                       0.114551084 
                              Kankakee-Bradley, IL 
                                       0.114942529 
                                         Chico, CA 
                                       0.116666667 
                 Charlotte-Gastonia-Concord, NC-SC 
                                       0.117988395 
                                  Raleigh-Cary, NC 
                                       0.119047619 
                              Colorado Springs, CO 
                                       0.120967742 
                                       Olympia, WA 
                                       0.121212121 
                         Fort Collins-Loveland, CO 
                                       0.121359223 
      Washington-Arlington-Alexandria, DC-VA-MD-WV 
                                       0.121378980 
                                Kansas City, MO-KS 
                                       0.121621622 
                           Athens-Clark County, GA 
                                       0.123076923 
                                        Lawton, OK 
                                       0.123711340 
                                     Green Bay, WI 
                                       0.125000000 
                                  Jacksonville, NC 
                                       0.126984127 
                                      Prescott, AZ 
                                       0.129629630 
                                 Trenton-Ewing, NJ 
                                       0.131868132 
                                       Wichita, KS 
                                       0.133489461 
                         Lakeland-Winter Haven, FL 
                                       0.134228188 
                         Scranton-Wilkes Barre, PA 
                                       0.136363636 
                          Grand Rapids-Wyoming, MI 
                                       0.138157895 
                              Ogden-Clearfield, UT 
                                       0.144208038 
                                       Boulder, CO 
                                       0.146198830 
             Fayetteville-Springdale-Rogers, AR-MO 
                                       0.148837209 
                        Santa-Cruz-Watsonville, CA 
                                       0.151515152 
                                Salt Lake City, UT 
                                       0.154910097 
                                  Fayetteville, NC 
                                       0.155844156 
                                         Ocala, FL 
                                       0.157894737 
               Tampa-St. Petersburg-Clearwater, FL 
                                       0.159144893 
                                       Greeley, CO 
                                       0.160493827 
               Chicago-Naperville-Joliet, IN-IN-WI 
                                       0.167388167 
                           Naples-Marco Island, FL 
                                       0.182926829 
                                   Reno-Sparks, NV 
                                       0.196774194 
                 San Francisco-Oakland-Fremont, CA 
                                       0.199855700 
                                   Columbus, GA-AL 
                                       0.203389831 
                             Vallejo-Fairfield, CA 
                                       0.210526316 
                                       Reading, PA 
                                       0.211267606 
                                         Salem, OR 
                                       0.211764706 
                                       Orlando, FL 
                                       0.213114754 
                                Springfield, MA-CT 
                                       0.219354839 
                          Beaumont-Port Author, TX 
                                       0.227642276 
New York-Northern New Jersey-Long Island, NY-NJ-PA 
                                       0.228508042 
                                          Napa, CA 
                                       0.229508197 
                                 Denver-Aurora, CO 
                                       0.232047872 
                           Santa Rosa-Petaluma, CA 
                                       0.232558140 
                                    Farmington, NM 
                                       0.234375000 
                   San Luis Obispo-Paso Robles, CA 
                                       0.246753247 
                                     Waterbury, CT 
                                       0.248407643 
                            Las Vegas-Paradise, NV 
                                       0.251732102 
                       Phoenix-Mesa-Scottsdale, AZ 
                                       0.254376931 
                                      Amarillo, TX 
                                       0.261363636 
             Sacramento-Arden-Arcade-Roseville, CA 
                                       0.263868066 
                 San Diego-Carlsbad-San Marcos, CA 
                                       0.269018743 
              Poughkeepsie-Newburgh-Middletown, NY 
                                       0.273631841 
                   Dallas-Fort Worth-Arlington, TX 
                                       0.283950617 
                                       Lubbock, TX 
                                       0.285714286 
                                      Longview, TX 
                                       0.292307692 
                                        Pueblo, CO 
                                       0.307692308 
                             Austin-Round Rock, TX 
                                       0.310077519 
                San Jose-Sunnyvale-Santa Clara, CA 
                                       0.316417910 
                                      Stockton, CA 
                                       0.321243523 
                                          Waco, TX 
                                       0.329113924 
                                       Danbury, CT 
                                       0.339285714 
                                       Modesto, CA 
                                       0.341772152 
                                       Midland, TX 
                                       0.352941176 
                                        Yakima, WA 
                                       0.357142857 
                    Houston-Baytown-Sugar Land, TX 
                                       0.359005458 
                  Oxnard-Thousand Oaks-Ventura, CA 
                                       0.359550562 
                      Killeen-Temple-Fort Hood, TX 
                                       0.386138614 
              Santa Barbara-Santa Maria-Goleta, CA 
                                       0.401515152 
                  Vineland-Millville-Bridgeton, NJ 
                                       0.407407407 
                                        Fresno, CA 
                                       0.409240924 
                           Visalia-Porterville, CA 
                                       0.438016529 
                         Cape Coral-Fort Myers, FL 
                                       0.438356164 
                                   Albuquerque, NM 
                                       0.441707718 
              Los Angeles-Long Beach-Santa Ana, CA 
                                       0.460263286 
                                      Santa Fe, NM 
                                       0.461538462 
                                      Victoria, TX 
                                       0.465517241 
             Miami-Fort Lauderdale-Miami Beach, FL 
                                       0.467824968 
                                   Bakersfield, CA 
                                       0.489795918 
                      Riverside-San Bernardino, CA 
                                       0.502325581 
                                        Tucson, AZ 
                                       0.506622517 
                                    Las Cruses, NM 
                                       0.542056075 
                                       Salinas, CA 
                                       0.557692308 
                                        Merced, CA 
                                       0.566037736 
                                Corpus Christi, TX 
                                       0.606060606 
                                        Madera, CA 
                                       0.614035088 
                                   San Antonio, TX 
                                       0.644151565 
                                     El Centro, CA 
                                       0.686868687 
                                       El Paso, TX 
                                       0.790983607 
                         Brownsville-Harlingen, TX 
                                       0.797468354 
                        McAllen-Edinburg-Pharr, TX 
                                       0.948717949 
                                        Laredo, TX 
                                       0.966292135 

3.5

Remembering that CPS$Race == “Asian” returns a TRUE/FALSE vector of whether an interviewee is Asian, determine the number of metropolitan areas in the United States from which at least 20% of interviewees are Asian.

sort(tapply(CPS$Race == "Asian",CPS$MetroArea,mean))
                                        Albany, GA 
                                       0.000000000 
                                       Altoona, PA 
                                       0.000000000 
                                      Amarillo, TX 
                                       0.000000000 
                                      Anderson, IN 
                                       0.000000000 
                                       Appleton,WI 
                                       0.000000000 
                                     Asheville, NC 
                                       0.000000000 
                               Barnstable Town, MA 
                                       0.000000000 
                          Beaumont-Port Author, TX 
                                       0.000000000 
                                      Billings, MT 
                                       0.000000000 
                                    Binghamton, NY 
                                       0.000000000 
                                   Bloomington, IN 
                                       0.000000000 
                                 Bowling Green, KY 
                                       0.000000000 
                              Canton-Massillon, OH 
                                       0.000000000 
                                    Charleston, WV 
                                       0.000000000 
                                         Chico, CA 
                                       0.000000000 
                                   Columbus, GA-AL 
                                       0.000000000 
                                       Decatur, IL 
                                       0.000000000 
                                        Durham, NC 
                                       0.000000000 
                                    Eau Claire, WI 
                                       0.000000000 
                                       El Paso, TX 
                                       0.000000000 
                                          Erie, PA 
                                       0.000000000 
                                    Farmington, NM 
                                       0.000000000 
                                      Florence, AL 
                                       0.000000000 
                     Hagerstown-Martinsburg, MD-WV 
                                       0.000000000 
                                    Huntsville, AL 
                                       0.000000000 
                                       Jackson, MI 
                                       0.000000000 
                                       Jackson, MS 
                                       0.000000000 
                                    Janesville, WI 
                                       0.000000000 
                                  Johnson City, TN 
                                       0.000000000 
                                        Joplin, MO 
                                       0.000000000 
                              Kankakee-Bradley, IL 
                                       0.000000000 
                      Killeen-Temple-Fort Hood, TX 
                                       0.000000000 
                          Kingsport-Bristol, TN-VA 
                                       0.000000000 
                                     Knoxville, TN 
                                       0.000000000 
                                     Lafayette, LA 
                                       0.000000000 
                          Lansing-East Lansing, MI 
                                       0.000000000 
                                        Laredo, TX 
                                       0.000000000 
                  Leominster-Fitchburg-Gardner, MA 
                                       0.000000000 
                                      Longview, TX 
                                       0.000000000 
                                       Lubbock, TX 
                                       0.000000000 
                                     Lynchburg, VA 
                                       0.000000000 
                                         Macon, GA 
                                       0.000000000 
                                        Madera, CA 
                                       0.000000000 
                        McAllen-Edinburg-Pharr, TX 
                                       0.000000000 
                        Michigan City-La Porte, IN 
                                       0.000000000 
                                       Midland, TX 
                                       0.000000000 
                                        Monroe, MI 
                                       0.000000000 
                        Muskegon-Norton Shores, MI 
                                       0.000000000 
        Myrtle Beach-Conway-North Myrtle Beach, SC 
                                       0.000000000 
                           Niles-Benton Harbor, MI 
                                       0.000000000 
                                    Ocean City, NJ 
                                       0.000000000 
                                Oshkosh-Neenah, WI 
                                       0.000000000 
                    Port St. Lucie-Fort Pierce, FL 
                                       0.000000000 
              Poughkeepsie-Newburgh-Middletown, NY 
                                       0.000000000 
                                        Pueblo, CO 
                                       0.000000000 
                                   Punta Gorda, FL 
                                       0.000000000 
                                        Racine, WI 
                                       0.000000000 
                                       Reading, PA 
                                       0.000000000 
                                       Roanoke, VA 
                                       0.000000000 
                                      Rockford, IL 
                                       0.000000000 
                Saginaw-Saginaw Township North, MI 
                                       0.000000000 
                                         Salem, OR 
                                       0.000000000 
                                     Salisbury, MD 
                                       0.000000000 
                                      Santa Fe, NM 
                                       0.000000000 
                        Santa-Cruz-Watsonville, CA 
                                       0.000000000 
                         Scranton-Wilkes Barre, PA 
                                       0.000000000 
                       Shreveport-Bossier City, LA 
                                       0.000000000 
                       South Bend-Mishawaka, IN-MI 
                                       0.000000000 
                                   Spartanburg, SC 
                                       0.000000000 
                                Springfield, MA-CT 
                                       0.000000000 
                                   Springfield, OH 
                                       0.000000000 
                                     St. Cloud, MN 
                                       0.000000000 
                                   Tallahassee, FL 
                                       0.000000000 
                                    Tuscaloosa, AL 
                                       0.000000000 
                                    Utica-Rome, NY 
                                       0.000000000 
                                      Valdosta, GA 
                                       0.000000000 
                                    Vero Beach, FL 
                                       0.000000000 
                                      Victoria, TX 
                                       0.000000000 
                  Vineland-Millville-Bridgeton, NJ 
                                       0.000000000 
                                          Waco, TX 
                                       0.000000000 
                                     Waterbury, CT 
                                       0.000000000 
                                        Wausau, WI 
                                       0.000000000 
                                  St. Louis, MO-IL 
                                       0.002092050 
                   New Orleans-Metairie-Kenner, LA 
                                       0.002724796 
                                   San Antonio, TX 
                                       0.003294893 
                   Charleston-North Charleston, SC 
                                       0.004310345 
                                        Monroe, LA 
                                       0.005586592 
                                Chattanooga, TN-GA 
                                       0.005988024 
                                       Modesto, CA 
                                       0.006329114 
                                          Bend, OR 
                                       0.007142857 
                                        Dayton, OH 
                                       0.007462687 
              Santa Barbara-Santa Maria-Goleta, CA 
                                       0.007575758 
                           Santa Rosa-Petaluma, CA 
                                       0.007751938 
                                        Toledo, OH 
                                       0.008510638 
                                 Coeur d'Alene, ID 
                                       0.008547009 
                                  York-Hanover, PA 
                                       0.008547009 
                                        Yakima, WA 
                                       0.008928571 
                          Grand Rapids-Wyoming, MI 
                                       0.009868421 
                                   Sioux Falls, SD 
                                       0.010084034 
                                 Evansville, IN-KY 
                                       0.010101010 
                                      Lawrence, KS 
                                       0.010204082 
                       Cleveland-Elyria-Mentor, OH 
                                       0.010279001 
                                        Lawton, OK 
                                       0.010309278 
                              Boise City-Nampa, ID 
                                       0.010869565 
                           Harrisburg-Carlisle, PA 
                                       0.011494253 
                                      Kingston, NY 
                                       0.011494253 
                                 Louisville, KY-IN 
                                       0.011560694 
                                       Medford, OR 
                                       0.012195122 
                                       Greeley, CO 
                                       0.012345679 
                                   Springfield, MO 
                                       0.012422360 
                             Birmingham-Hoover, AL 
                                       0.012755102 
                          Waterloo-Cedar Falls, IA 
                                       0.012820513 
                                    Provo-Orem, UT 
                                       0.012944984 
                    Youngstown-Warren-Boardman, OH 
                                       0.013071895 
                                         Ocala, FL 
                                       0.013157895 
                 Allentown-Bethlehem-Easton, PA-NJ 
                                       0.014970060 
                                Corpus Christi, TX 
                                       0.015151515 
                                         Dover, DE 
                                       0.015350877 
                 Charlotte-Gastonia-Concord, NC-SC 
                                       0.015473888 
                     Sarasota-Bradenton-Venice, FL 
                                       0.015625000 
                             Kalamazoo-Portage, MI 
                                       0.015748031 
                                 Winston-Salem, NC 
                                       0.015748031 
                                     Johnstown, PA 
                                       0.015873016 
                              Colorado Springs, CO 
                                       0.016129032 
                              Champaign-Urbana, IL 
                                       0.016393443 
                                          Napa, CA 
                                       0.016393443 
                        Panama City-Lynn Haven, FL 
                                       0.016949153 
                                 Memphis, TN-MS-AR 
                                       0.017241379 
                                      Columbus, OH 
                                       0.018148820 
                                      Prescott, AZ 
                                       0.018518519 
                                    Las Cruses, NM 
                                       0.018691589 
                    Pensacola-Ferry Pass-Brent, FL 
                                       0.018691589 
                                       Spokane, WA 
                                       0.019230769 
                         Fort Collins-Loveland, CO 
                                       0.019417476 
                                         Flint, MI 
                                       0.019607843 
                                      Savannah, GA 
                                       0.019801980 
                                        Tucson, AZ 
                                       0.019867550 
                                     El Centro, CA 
                                       0.020202020 
                            Eugene-Springfield, OR 
                                       0.020408163 
               Davenport-Moline-Rock Island, IA-IL 
                                       0.020833333 
            Deltona-Daytona Beach-Ormond Beach, FL 
                                       0.021428571 
                                        Topeka, KS 
                                       0.021978022 
                   Cincinnati-Middletown, OH-KY-IN 
                                       0.022253129 
                 Little Rock-North Little Rock, AR 
                                       0.022277228 
                       Albany-Schenectady-Troy, NY 
                                       0.022388060 
                                   Baton Rouge, LA 
                                       0.022900763 
                          Bremerton-Silverdale, WA 
                                       0.022988506 
                                        Bangor, ME 
                                       0.024038462 
                           Naples-Marco Island, FL 
                                       0.024390244 
                                  Indianapolis, IN 
                                       0.024561404 
                    Augusta-Richmond County, GA-SC 
                                       0.024844720 
                           Holland-Grand Haven, MI 
                                       0.025641026 
                                  Fayetteville, NC 
                                       0.025974026 
                              Ogden-Clearfield, UT 
                                       0.026004728 
                            Rochester-Dover, NH-ME 
                                       0.026717557 
        Virginia Beach-Norfolk-Newport News, VA-NC 
                                       0.026800670 
                         Lakeland-Winter Haven, FL 
                                       0.026845638 
                                      Columbia, SC 
                                       0.027491409 
                                      Fargo, ND-MN 
                                       0.027777778 
                                    Bellingham, WA 
                                       0.028571429 
                                    Montgomery, AL 
                                       0.029126214 
                       Omaha-Council Bluffs, NE-IA 
                                       0.029258098 
                                         Akron, OH 
                                       0.030303030 
                                       Wichita, KS 
                                       0.030444965 
                           Athens-Clark County, GA 
                                       0.030769231 
                               Gulfport-Biloxi, MS 
                                       0.030769231 
                                      Anderson, SC 
                                       0.031250000 
                                 Denver-Aurora, CO 
                                       0.031914894 
                                    Greenville, SC 
                                       0.032432432 
          Philadelphia-Camden-Wilmington, PA-NJ-DE 
                                       0.032924694 
                                  Harrisonburg, VA 
                                       0.033333333 
                         Cape Coral-Fort Myers, FL 
                                       0.034246575 
                                Kansas City, MO-KS 
                                       0.034303534 
                                  Worcester, MA-CT 
                                       0.034722222 
                                 Oklahoma City, OK 
                                       0.034768212 
                     Hickory-Morgantown-Lenoir, NC 
                                       0.035087719 
                             Lexington-Fayette, KY 
                                       0.035353535 
             Miami-Fort Lauderdale-Miami Beach, FL 
                                       0.035392535 
                 Palm Bay-Melbourne-Titusville, FL 
                                       0.035714286 
                                Salt Lake City, UT 
                                       0.035961272 
                                        Mobile, AL 
                                       0.036363636 
                      Huntington-Ashland, WV-KY-OH 
                                       0.036585366 
                                      Richmond, VA 
                                       0.036734694 
                                    Fort Wayne, IN 
                                       0.036764706 
            Fort Walton Beach-Crestview-Destin, FL 
                                       0.037500000 
                                    Des Moines, IA 
                                       0.037924152 
                       Phoenix-Mesa-Scottsdale, AZ 
                                       0.038105046 
                                    Pittsburgh, PA 
                                       0.038251366 
                   Bridgeport-Stamford-Norwalk, CT 
                                       0.038356164 
              Providence-Fall River-Warwick, MA-RI 
                                       0.038966725 
               Tampa-St. Petersburg-Clearwater, FL 
                                       0.039192399 
                                     Duluth, MN-WI 
                                       0.039682540 
                                      Syracuse, NY 
                                       0.040358744 
                                   Albuquerque, NM 
                                       0.041050903 
                                       Decatur, Al 
                                       0.041666667 
                       Portland-South Portland, ME 
                                       0.042796006 
                                   Gainesville, FL 
                                       0.042857143 
                        Detroit-Warren-Livonia, MI 
                                       0.043574594 
                                 Trenton-Ewing, NJ 
                                       0.043956044 
                                     New Haven, CT 
                                       0.047430830 
                                  Jacksonville, NC 
                                       0.047619048 
                 Milwaukee-Waukesha-West Allis, WI 
                                       0.047619048 
                                  Jacksonville, FL 
                                       0.048346056 
                   Burlington-South Burlington, VT 
                                       0.048706240 
                               Anniston-Oxford, AL 
                                       0.049180328 
                                         Tulsa, OK 
                                       0.049535604 
                                  Raleigh-Cary, NC 
                                       0.050595238 
                                       Orlando, FL 
                                       0.050819672 
             Fayetteville-Springdale-Rogers, AR-MO 
                                       0.051162791 
                   San Luis Obispo-Paso Robles, CA 
                                       0.051948052 
                    Boston-Cambridge-Quincy, MA-NH 
                                       0.052041274 
                             Austin-Round Rock, TX 
                                       0.052325581 
                         Buffalo-Niagara Falls, NY 
                                       0.052325581 
                                   Springfield, IL 
                                       0.052631579 
                                     Iowa City, IA 
                                       0.053435115 
                                        Peoria, IL 
                                       0.053571429 
                                       Madison, WI 
                                       0.056338028 
                                        Merced, CA 
                                       0.056603774 
                                 Fort Smith, AR-OK 
                                       0.057142857 
               Nashville-Davidson-Murfreesboro, TN 
                                       0.057425743 
                                     Lancaster, PA 
                                       0.057692308 
                              Baltimore-Towson, MD 
                                       0.057990560 
                                   Reno-Sparks, NV 
                                       0.058064516 
               Chicago-Naperville-Joliet, IN-IN-WI 
                                       0.058441558 
                                       Boulder, CO 
                                       0.058479532 
                    Houston-Baytown-Sugar Land, TX 
                                       0.061249242 
                      Riverside-San Bernardino, CA 
                                       0.062015504 
                                       Danbury, CT 
                                       0.062500000 
                   Dallas-Fort Worth-Arlington, TX 
                                       0.062801932 
                                      Columbia, MO 
                                       0.063829787 
                                     Rochester, NY 
                                       0.065146580 
                                  Cedar Rapids, IA 
                                       0.066326531 
          Hartford-West Hartford-East Hartford, CT 
                                       0.066666667 
               Portland-Vancouver-Beaverton, OR-WA 
                                       0.069788797 
      Washington-Arlington-Alexandria, DC-VA-MD-WV 
                                       0.070624850 
                Atlanta-Sandy Springs-Marietta, GA 
                                       0.072809278 
                         Norwich-New London, CT-RI 
                                       0.073891626 
                                  Lake Charles, LA 
                                       0.074074074 
                  Oxnard-Thousand Oaks-Ventura, CA 
                                       0.074906367 
                             Bloomington-Normal IL 
                                       0.075000000 
                         Brownsville-Harlingen, TX 
                                       0.075949367 
            Minneapolis-St Paul-Bloomington, MN-WI 
                                       0.076725026 
                            Las Vegas-Paradise, NV 
                                       0.078521940 
                         Greensboro-High Point, NC 
                                       0.079681275 
                                   Bakersfield, CA 
                                       0.081632653 
                                     Ann Arbor, MI 
                                       0.082352941 
                                     La Crosse, WI 
                                       0.087719298 
                                     Green Bay, WI 
                                       0.088235294 
                           Visalia-Porterville, CA 
                                       0.090909091 
                       Seattle-Tacoma-Bellevue, WA 
                                       0.099601594 
New York-Northern New Jersey-Long Island, NY-NJ-PA 
                                       0.104270660 
                                       Salinas, CA 
                                       0.125000000 
                                       Olympia, WA 
                                       0.131313131 
              Los Angeles-Long Beach-Santa Ana, CA 
                                       0.135056070 
                 San Diego-Carlsbad-San Marcos, CA 
                                       0.142227122 
             Sacramento-Arden-Arcade-Roseville, CA 
                                       0.142428786 
                                 Atlantic City, NJ 
                                       0.144144144 
                                      Stockton, CA 
                                       0.155440415 
                                 Warner Robins, GA 
                                       0.166666667 
                                        Fresno, CA 
                                       0.184818482 
                             Vallejo-Fairfield, CA 
                                       0.203007519 
                San Jose-Sunnyvale-Santa Clara, CA 
                                       0.241791045 
                 San Francisco-Oakland-Fremont, CA 
                                       0.246753247 
                                      Honolulu, HI 
                                       0.501903553 

3.6

Normally, we would look at the sorted proportion of interviewees from each metropolitan area who have not received a high school diploma with the command:

sort(tapply(CPS$Education == "No high school diploma", CPS$MetroArea, mean))

However, none of the interviewees aged 14 and younger have an education value reported, so the mean value is reported as NA for each metropolitan area. To get mean (and related functions, like sum) to ignore missing values, you can pass the parameter na.rm=TRUE. Passing na.rm=TRUE to the tapply function, determine which metropolitan area has the smallest proportion of interviewees who have received no high school diploma.

Section 4 - Integrating Country of Birth Data

Just as we did with the metropolitan area information, merge in the country of birth information from the CountryMap data frame, replacing the CPS data frame with the result. If you accidentally overwrite CPS with the wrong values, remember that you can restore it by re-loading the data frame from CPSData.csv and then merging in the metropolitan area information using the command provided in the previous subproblem.

4.1

What is the name of the variable added to the CPS data frame by this merge operation?

summary(CPS)
 CountryOfBirthCode MetroAreaCode   PeopleInHousehold
 Min.   : 57.00     Min.   :10420   Min.   : 1.000   
 1st Qu.: 57.00     1st Qu.:21780   1st Qu.: 2.000   
 Median : 57.00     Median :34740   Median : 3.000   
 Mean   : 82.68     Mean   :35075   Mean   : 3.284   
 3rd Qu.: 57.00     3rd Qu.:41860   3rd Qu.: 4.000   
 Max.   :555.00     Max.   :79600   Max.   :15.000   
                    NA's   :34238                    
       Region               State      
 Midwest  :30684   California  :11570  
 Northeast:25939   Texas       : 7077  
 South    :41502   New York    : 5595  
 West     :33177   Florida     : 5149  
                   Pennsylvania: 3930  
                   Illinois    : 3912  
                   (Other)     :94069  
      Age                 Married          Sex       
 Min.   : 0.00   Divorced     :11151   Female:67481  
 1st Qu.:19.00   Married      :55509   Male  :63821  
 Median :39.00   Never Married:30772                 
 Mean   :38.83   Separated    : 2027                 
 3rd Qu.:57.00   Widowed      : 6505                 
 Max.   :85.00   NA's         :25338                 
                                                     
                   Education    
 High school            :30906  
 Bachelor's degree      :19443  
 Some college, no degree:18863  
 No high school diploma :16095  
 Associate degree       : 9913  
 (Other)                :10744  
 NA's                   :25338  
               Race           Hispanic     
 American Indian :  1433   Min.   :0.0000  
 Asian           :  6520   1st Qu.:0.0000  
 Black           : 13913   Median :0.0000  
 Multiracial     :  2897   Mean   :0.1393  
 Pacific Islander:   618   3rd Qu.:0.0000  
 White           :105921   Max.   :1.0000  
                                           
               Citizenship    
 Citizen, Native     :116639  
 Citizen, Naturalized:  7073  
 Non-Citizen         :  7590  
                              
                              
                              
                              
           EmploymentStatus
 Disabled          : 5712  
 Employed          :61733  
 Not in Labor Force:15246  
 Retired           :18619  
 Unemployed        : 4203  
 NA's              :25789  
                           
                               Industry    
 Educational and health services   :15017  
 Trade                             : 8933  
 Professional and business services: 7519  
 Manufacturing                     : 6791  
 Leisure and hospitality           : 6364  
 (Other)                           :21618  
 NA's                              :65060  
                                              MetroArea    
 New York-Northern New Jersey-Long Island, NY-NJ-PA: 5409  
 Washington-Arlington-Alexandria, DC-VA-MD-WV      : 4177  
 Los Angeles-Long Beach-Santa Ana, CA              : 4102  
 Philadelphia-Camden-Wilmington, PA-NJ-DE          : 2855  
 Chicago-Naperville-Joliet, IN-IN-WI               : 2772  
 (Other)                                           :77749  
 NA's                                              :34238  
          Country      
 United States:115063  
 Mexico       :  3921  
 Philippines  :   839  
 India        :   770  
 China        :   581  
 (Other)      :  9952  
 NA's         :   176  

How many interviewees have a missing value for the new country of birth variable?

summary(CPS)
 CountryOfBirthCode MetroAreaCode   PeopleInHousehold
 Min.   : 57.00     Min.   :10420   Min.   : 1.000   
 1st Qu.: 57.00     1st Qu.:21780   1st Qu.: 2.000   
 Median : 57.00     Median :34740   Median : 3.000   
 Mean   : 82.68     Mean   :35075   Mean   : 3.284   
 3rd Qu.: 57.00     3rd Qu.:41860   3rd Qu.: 4.000   
 Max.   :555.00     Max.   :79600   Max.   :15.000   
                    NA's   :34238                    
       Region               State      
 Midwest  :30684   California  :11570  
 Northeast:25939   Texas       : 7077  
 South    :41502   New York    : 5595  
 West     :33177   Florida     : 5149  
                   Pennsylvania: 3930  
                   Illinois    : 3912  
                   (Other)     :94069  
      Age                 Married          Sex       
 Min.   : 0.00   Divorced     :11151   Female:67481  
 1st Qu.:19.00   Married      :55509   Male  :63821  
 Median :39.00   Never Married:30772                 
 Mean   :38.83   Separated    : 2027                 
 3rd Qu.:57.00   Widowed      : 6505                 
 Max.   :85.00   NA's         :25338                 
                                                     
                   Education    
 High school            :30906  
 Bachelor's degree      :19443  
 Some college, no degree:18863  
 No high school diploma :16095  
 Associate degree       : 9913  
 (Other)                :10744  
 NA's                   :25338  
               Race           Hispanic     
 American Indian :  1433   Min.   :0.0000  
 Asian           :  6520   1st Qu.:0.0000  
 Black           : 13913   Median :0.0000  
 Multiracial     :  2897   Mean   :0.1393  
 Pacific Islander:   618   3rd Qu.:0.0000  
 White           :105921   Max.   :1.0000  
                                           
               Citizenship    
 Citizen, Native     :116639  
 Citizen, Naturalized:  7073  
 Non-Citizen         :  7590  
                              
                              
                              
                              
           EmploymentStatus
 Disabled          : 5712  
 Employed          :61733  
 Not in Labor Force:15246  
 Retired           :18619  
 Unemployed        : 4203  
 NA's              :25789  
                           
                               Industry    
 Educational and health services   :15017  
 Trade                             : 8933  
 Professional and business services: 7519  
 Manufacturing                     : 6791  
 Leisure and hospitality           : 6364  
 (Other)                           :21618  
 NA's                              :65060  
                                              MetroArea    
 New York-Northern New Jersey-Long Island, NY-NJ-PA: 5409  
 Washington-Arlington-Alexandria, DC-VA-MD-WV      : 4177  
 Los Angeles-Long Beach-Santa Ana, CA              : 4102  
 Philadelphia-Camden-Wilmington, PA-NJ-DE          : 2855  
 Chicago-Naperville-Joliet, IN-IN-WI               : 2772  
 (Other)                                           :77749  
 NA's                                              :34238  
          Country      
 United States:115063  
 Mexico       :  3921  
 Philippines  :   839  
 India        :   770  
 China        :   581  
 (Other)      :  9952  
 NA's         :   176  

4.2

Among all interviewees born outside of North America, which country was the most common place of birth?

sort(summary(CPS$Country))
                   Austria                    Albania 
                        17                         18 
                    Norway      Europe, not specified 
                        18                         19 
                Uzbekistan West Indies, not specified 
                        19                         19 
                  Malaysia                     Serbia 
                        20                         20 
                    Azores                       USSR 
                        22                         22 
               New Zealand                Switzerland 
                        23                         23 
                     Yemen                    Belarus 
                        23                         24 
                  Scotland                 Yugoslavia 
                        24                         24 
                   Hungary                Afghanistan 
                        25                         26 
                 Indonesia                Netherlands 
                        26                         28 
                    Sweden                   Bulgaria 
                        28                         29 
                Costa Rica               Saudi Arabia 
                        29                         29 
                      Guam                   Cameroon 
                        31                         32 
                     Syria                    Armenia 
                        32                         35 
                    Jordan                      Chile 
                        36                         37 
       Asia, not specified                    Ireland 
                        39                         39 
                     Spain                 Bangladesh 
                        41                         42 
                 Australia                      Nepal 
                        43                         44 
                    Panama                    Lebanon 
                        44                         45 
           Myanmar (Burma)               South Africa 
                        45                         48 
                    Turkey                   Cambodia 
                        48                         49 
                   Liberia                      Kenya 
                        52                         55 
                   Romania                     Greece 
                        55                         56 
                    Israel        Trinidad and Tobago 
                        57                         60 
      Bosnia & Herzegovina                  Venezuela 
                        61                         61 
                 Argentina                  Hong Kong 
                        64                         64 
                  Portugal                      Egypt 
                        64                         65 
                   Somalia                     France 
                        72                         73 
               South Korea                      Ghana 
                        73                         76 
                 Nicaragua                   Ethiopia 
                        76                         80 
                 Elsewhere                    Nigeria 
                        81                         85 
                      Iraq                       Laos 
                        97                         98 
                    Taiwan                    Ukraine 
                       102                        104 
                    Guyana                   Pakistan 
                       109                        109 
            United Kingdom                   Thailand 
                       111                        128 
     Africa, not specified                    Ecuador 
                       129                        136 
                      Peru                       Iran 
                       136                        144 
                     Italy                     Brazil 
                       149                        159 
                    Poland                      Haiti 
                       162                        167 
                    Russia                       NA's 
                       173                        176 
                   England                      Japan 
                       179                        187 
                  Honduras                   Columbia 
                       189                        206 
                   Jamaica                  Guatemala 
                       217                        309 
        Dominican Republic                      Korea 
                       330                        334 
                    Canada                       Cuba 
                       410                        426 
                   Germany                    (Other) 
                       438                        446 
                   Vietnam                El Salvador 
                       458                        477 
               Puerto Rico                      China 
                       518                        581 
                     India                Philippines 
                       770                        839 
                    Mexico              United States 
                      3921                     115063 

4.3

What proportion of the interviewees from the “New York-Northern New Jersey-Long Island, NY-NJ-PA” metropolitan area have a country of birth that is not the United States? For this computation, don’t include people from this metropolitan area who have a missing country of birth.

1668/(1668+3736)
[1] 0.3086603

4.4

Which metropolitan area has the largest number (note – not proportion) of interviewees with a country of birth in India? Hint – remember to include na.rm=TRUE if you are using tapply() to answer this question.

  • Boston-Cambridge-Quincy, MA-NH
  • Minneapolis-St Paul-Bloomington, MN-WI
  • New York-Northern New Jersey-Long Island, NY-NJ-PA
  • Washington-Arlington-Alexandria, DC-VA-MD-WV
sort(tapply(CPS$Country == "India", CPS$MetroArea, sum, na.rm=TRUE))
                                         Akron, OH 
                                                 0 
                       Albany-Schenectady-Troy, NY 
                                                 0 
                                        Albany, GA 
                                                 0 
                 Allentown-Bethlehem-Easton, PA-NJ 
                                                 0 
                                       Altoona, PA 
                                                 0 
                                      Amarillo, TX 
                                                 0 
                                      Anderson, IN 
                                                 0 
                                     Ann Arbor, MI 
                                                 0 
                               Anniston-Oxford, AL 
                                                 0 
                                       Appleton,WI 
                                                 0 
                                     Asheville, NC 
                                                 0 
                           Athens-Clark County, GA 
                                                 0 
                    Augusta-Richmond County, GA-SC 
                                                 0 
                                        Bangor, ME 
                                                 0 
                               Barnstable Town, MA 
                                                 0 
                                   Baton Rouge, LA 
                                                 0 
                          Beaumont-Port Author, TX 
                                                 0 
                                    Bellingham, WA 
                                                 0 
                                          Bend, OR 
                                                 0 
                                      Billings, MT 
                                                 0 
                                    Binghamton, NY 
                                                 0 
                                   Bloomington, IN 
                                                 0 
                                       Boulder, CO 
                                                 0 
                                 Bowling Green, KY 
                                                 0 
                          Bremerton-Silverdale, WA 
                                                 0 
                         Buffalo-Niagara Falls, NY 
                                                 0 
                              Canton-Massillon, OH 
                                                 0 
                         Cape Coral-Fort Myers, FL 
                                                 0 
                                  Cedar Rapids, IA 
                                                 0 
                              Champaign-Urbana, IL 
                                                 0 
                                    Charleston, WV 
                                                 0 
                                Chattanooga, TN-GA 
                                                 0 
                                         Chico, CA 
                                                 0 
                                 Coeur d'Alene, ID 
                                                 0 
                              Colorado Springs, CO 
                                                 0 
                                      Columbia, MO 
                                                 0 
                                   Columbus, GA-AL 
                                                 0 
                                      Columbus, OH 
                                                 0 
                                Corpus Christi, TX 
                                                 0 
                                       Danbury, CT 
                                                 0 
               Davenport-Moline-Rock Island, IA-IL 
                                                 0 
                                        Dayton, OH 
                                                 0 
                                       Decatur, Al 
                                                 0 
                                       Decatur, IL 
                                                 0 
                                 Denver-Aurora, CO 
                                                 0 
                                         Dover, DE 
                                                 0 
                                     Duluth, MN-WI 
                                                 0 
                                        Durham, NC 
                                                 0 
                                    Eau Claire, WI 
                                                 0 
                                     El Centro, CA 
                                                 0 
                                       El Paso, TX 
                                                 0 
                                          Erie, PA 
                                                 0 
                            Eugene-Springfield, OR 
                                                 0 
                                 Evansville, IN-KY 
                                                 0 
                                      Fargo, ND-MN 
                                                 0 
                                    Farmington, NM 
                                                 0 
                                  Fayetteville, NC 
                                                 0 
                                         Flint, MI 
                                                 0 
                                      Florence, AL 
                                                 0 
                         Fort Collins-Loveland, CO 
                                                 0 
                                 Fort Smith, AR-OK 
                                                 0 
            Fort Walton Beach-Crestview-Destin, FL 
                                                 0 
                                   Gainesville, FL 
                                                 0 
                          Grand Rapids-Wyoming, MI 
                                                 0 
                                       Greeley, CO 
                                                 0 
                                     Green Bay, WI 
                                                 0 
                         Greensboro-High Point, NC 
                                                 0 
                               Gulfport-Biloxi, MS 
                                                 0 
                     Hagerstown-Martinsburg, MD-WV 
                                                 0 
                                  Harrisonburg, VA 
                                                 0 
                     Hickory-Morgantown-Lenoir, NC 
                                                 0 
                           Holland-Grand Haven, MI 
                                                 0 
                      Huntington-Ashland, WV-KY-OH 
                                                 0 
                                    Huntsville, AL 
                                                 0 
                                       Jackson, MI 
                                                 0 
                                       Jackson, MS 
                                                 0 
                                  Jacksonville, NC 
                                                 0 
                                    Janesville, WI 
                                                 0 
                                  Johnson City, TN 
                                                 0 
                                     Johnstown, PA 
                                                 0 
                                        Joplin, MO 
                                                 0 
                             Kalamazoo-Portage, MI 
                                                 0 
                              Kankakee-Bradley, IL 
                                                 0 
                      Killeen-Temple-Fort Hood, TX 
                                                 0 
                          Kingsport-Bristol, TN-VA 
                                                 0 
                                      Kingston, NY 
                                                 0 
                                     Knoxville, TN 
                                                 0 
                                     La Crosse, WI 
                                                 0 
                                     Lafayette, LA 
                                                 0 
                                  Lake Charles, LA 
                                                 0 
                         Lakeland-Winter Haven, FL 
                                                 0 
                                     Lancaster, PA 
                                                 0 
                          Lansing-East Lansing, MI 
                                                 0 
                                        Laredo, TX 
                                                 0 
                                    Las Cruses, NM 
                                                 0 
                                        Lawton, OK 
                                                 0 
                  Leominster-Fitchburg-Gardner, MA 
                                                 0 
                             Lexington-Fayette, KY 
                                                 0 
                                      Longview, TX 
                                                 0 
                                 Louisville, KY-IN 
                                                 0 
                                       Lubbock, TX 
                                                 0 
                                     Lynchburg, VA 
                                                 0 
                                         Macon, GA 
                                                 0 
                                        Madera, CA 
                                                 0 
                        McAllen-Edinburg-Pharr, TX 
                                                 0 
                                       Medford, OR 
                                                 0 
                                        Merced, CA 
                                                 0 
                        Michigan City-La Porte, IN 
                                                 0 
                                       Midland, TX 
                                                 0 
                                        Mobile, AL 
                                                 0 
                                       Modesto, CA 
                                                 0 
                                        Monroe, LA 
                                                 0 
                                        Monroe, MI 
                                                 0 
                                    Montgomery, AL 
                                                 0 
                        Muskegon-Norton Shores, MI 
                                                 0 
        Myrtle Beach-Conway-North Myrtle Beach, SC 
                                                 0 
                                          Napa, CA 
                                                 0 
                           Niles-Benton Harbor, MI 
                                                 0 
                                         Ocala, FL 
                                                 0 
                                    Ocean City, NJ 
                                                 0 
                                Oshkosh-Neenah, WI 
                                                 0 
                 Palm Bay-Melbourne-Titusville, FL 
                                                 0 
                        Panama City-Lynn Haven, FL 
                                                 0 
                    Pensacola-Ferry Pass-Brent, FL 
                                                 0 
                    Port St. Lucie-Fort Pierce, FL 
                                                 0 
                       Portland-South Portland, ME 
                                                 0 
              Poughkeepsie-Newburgh-Middletown, NY 
                                                 0 
                                      Prescott, AZ 
                                                 0 
                                        Pueblo, CO 
                                                 0 
                                   Punta Gorda, FL 
                                                 0 
                                        Racine, WI 
                                                 0 
                                  Raleigh-Cary, NC 
                                                 0 
                                       Reading, PA 
                                                 0 
                                      Richmond, VA 
                                                 0 
                      Riverside-San Bernardino, CA 
                                                 0 
                                       Roanoke, VA 
                                                 0 
                                      Rockford, IL 
                                                 0 
                Saginaw-Saginaw Township North, MI 
                                                 0 
                                         Salem, OR 
                                                 0 
                                       Salinas, CA 
                                                 0 
                                     Salisbury, MD 
                                                 0 
                                   San Antonio, TX 
                                                 0 
                   San Luis Obispo-Paso Robles, CA 
                                                 0 
              Santa Barbara-Santa Maria-Goleta, CA 
                                                 0 
                                      Santa Fe, NM 
                                                 0 
                           Santa Rosa-Petaluma, CA 
                                                 0 
                        Santa-Cruz-Watsonville, CA 
                                                 0 
                     Sarasota-Bradenton-Venice, FL 
                                                 0 
                                      Savannah, GA 
                                                 0 
                         Scranton-Wilkes Barre, PA 
                                                 0 
                       Shreveport-Bossier City, LA 
                                                 0 
                                   Sioux Falls, SD 
                                                 0 
                       South Bend-Mishawaka, IN-MI 
                                                 0 
                                   Spartanburg, SC 
                                                 0 
                                       Spokane, WA 
                                                 0 
                                Springfield, MA-CT 
                                                 0 
                                   Springfield, MO 
                                                 0 
                                   Springfield, OH 
                                                 0 
                                     St. Cloud, MN 
                                                 0 
                                  St. Louis, MO-IL 
                                                 0 
                                      Stockton, CA 
                                                 0 
                                   Tallahassee, FL 
                                                 0 
                                        Toledo, OH 
                                                 0 
                                        Topeka, KS 
                                                 0 
                                    Tuscaloosa, AL 
                                                 0 
                                    Utica-Rome, NY 
                                                 0 
                                      Valdosta, GA 
                                                 0 
                             Vallejo-Fairfield, CA 
                                                 0 
                                    Vero Beach, FL 
                                                 0 
                                      Victoria, TX 
                                                 0 
                  Vineland-Millville-Bridgeton, NJ 
                                                 0 
        Virginia Beach-Norfolk-Newport News, VA-NC 
                                                 0 
                                          Waco, TX 
                                                 0 
                                     Waterbury, CT 
                                                 0 
                          Waterloo-Cedar Falls, IA 
                                                 0 
                                        Wausau, WI 
                                                 0 
                                       Wichita, KS 
                                                 0 
                                  Worcester, MA-CT 
                                                 0 
                                        Yakima, WA 
                                                 0 
                                  York-Hanover, PA 
                                                 0 
                    Youngstown-Warren-Boardman, OH 
                                                 0 
                                      Anderson, SC 
                                                 1 
                             Bloomington-Normal IL 
                                                 1 
                              Boise City-Nampa, ID 
                                                 1 
                   Cincinnati-Middletown, OH-KY-IN 
                                                 1 
                                      Columbia, SC 
                                                 1 
                                    Greenville, SC 
                                                 1 
                           Harrisburg-Carlisle, PA 
                                                 1 
                                  Jacksonville, FL 
                                                 1 
                                      Lawrence, KS 
                                                 1 
                           Naples-Marco Island, FL 
                                                 1 
                   New Orleans-Metairie-Kenner, LA 
                                                 1 
                                       Olympia, WA 
                                                 1 
                                    Provo-Orem, UT 
                                                 1 
                                      Syracuse, NY 
                                                 1 
                                        Tucson, AZ 
                                                 1 
                                 Atlantic City, NJ 
                                                 2 
                                   Bakersfield, CA 
                                                 2 
                             Birmingham-Hoover, AL 
                                                 2 
                   Burlington-South Burlington, VT 
                                                 2 
                   Charleston-North Charleston, SC 
                                                 2 
                       Cleveland-Elyria-Mentor, OH 
                                                 2 
            Deltona-Daytona Beach-Ormond Beach, FL 
                                                 2 
                                    Fort Wayne, IN 
                                                 2 
                            Las Vegas-Paradise, NV 
                                                 2 
                                 Memphis, TN-MS-AR 
                                                 2 
             Miami-Fort Lauderdale-Miami Beach, FL 
                                                 2 
               Nashville-Davidson-Murfreesboro, TN 
                                                 2 
                              Ogden-Clearfield, UT 
                                                 2 
                                 Oklahoma City, OK 
                                                 2 
                  Oxnard-Thousand Oaks-Ventura, CA 
                                                 2 
                       Phoenix-Mesa-Scottsdale, AZ 
                                                 2 
                                     Rochester, NY 
                                                 2 
                                Salt Lake City, UT 
                                                 2 
                                   Springfield, IL 
                                                 2 
                                 Winston-Salem, NC 
                                                 2 
                                   Albuquerque, NM 
                                                 3 
                                     Iowa City, IA 
                                                 3 
                                       Madison, WI 
                                                 3 
                         Norwich-New London, CT-RI 
                                                 3 
                                   Reno-Sparks, NV 
                                                 3 
                           Visalia-Porterville, CA 
                                                 3 
                 Charlotte-Gastonia-Concord, NC-SC 
                                                 4 
                                  Indianapolis, IN 
                                                 4 
                       Omaha-Council Bluffs, NE-IA 
                                                 4 
                                        Peoria, IL 
                                                 4 
                            Rochester-Dover, NH-ME 
                                                 4 
                 San Diego-Carlsbad-San Marcos, CA 
                                                 4 
                                 Trenton-Ewing, NJ 
                                                 4 
                                         Tulsa, OK 
                                                 4 
                                       Orlando, FL 
                                                 5 
                       Seattle-Tacoma-Bellevue, WA 
                                                 5 
                             Austin-Round Rock, TX 
                                                 6 
                         Brownsville-Harlingen, TX 
                                                 6 
                                    Des Moines, IA 
                                                 6 
                 Little Rock-North Little Rock, AR 
                                                 6 
                                     New Haven, CT 
                                                 6 
               Portland-Vancouver-Beaverton, OR-WA 
                                                 6 
                                 Warner Robins, GA 
                                                 6 
               Tampa-St. Petersburg-Clearwater, FL 
                                                 7 
             Fayetteville-Springdale-Rogers, AR-MO 
                                                 8 
             Sacramento-Arden-Arcade-Roseville, CA 
                                                 8 
                                      Honolulu, HI 
                                                 9 
                    Boston-Cambridge-Quincy, MA-NH 
                                                11 
                                Kansas City, MO-KS 
                                                11 
                   Bridgeport-Stamford-Norwalk, CT 
                                                12 
                 Milwaukee-Waukesha-West Allis, WI 
                                                12 
              Providence-Fall River-Warwick, MA-RI 
                                                14 
                    Houston-Baytown-Sugar Land, TX 
                                                15 
                              Baltimore-Towson, MD 
                                                16 
                                        Fresno, CA 
                                                16 
                                    Pittsburgh, PA 
                                                16 
                   Dallas-Fort Worth-Arlington, TX 
                                                18 
              Los Angeles-Long Beach-Santa Ana, CA 
                                                19 
                San Jose-Sunnyvale-Santa Clara, CA 
                                                19 
            Minneapolis-St Paul-Bloomington, MN-WI 
                                                23 
          Hartford-West Hartford-East Hartford, CT 
                                                26 
                Atlanta-Sandy Springs-Marietta, GA 
                                                27 
                 San Francisco-Oakland-Fremont, CA 
                                                27 
                        Detroit-Warren-Livonia, MI 
                                                30 
               Chicago-Naperville-Joliet, IN-IN-WI 
                                                31 
          Philadelphia-Camden-Wilmington, PA-NJ-DE 
                                                32 
      Washington-Arlington-Alexandria, DC-VA-MD-WV 
                                                50 
New York-Northern New Jersey-Long Island, NY-NJ-PA 
                                                96 

In Brazil?

  • Boston-Cambridge-Quincy, MA-NH
  • Minneapolis-St Paul-Bloomington, MN-WI
  • New York-Northern New Jersey-Long Island, NY-NJ-PA
  • Washington-Arlington-Alexandria, DC-VA-MD-WV
sort(tapply(CPS$Country == "Brazil", CPS$MetroArea, sum, na.rm=TRUE))
                       Albany-Schenectady-Troy, NY 
                                                 0 
                                        Albany, GA 
                                                 0 
                 Allentown-Bethlehem-Easton, PA-NJ 
                                                 0 
                                       Altoona, PA 
                                                 0 
                                      Amarillo, TX 
                                                 0 
                                      Anderson, IN 
                                                 0 
                                      Anderson, SC 
                                                 0 
                                     Ann Arbor, MI 
                                                 0 
                               Anniston-Oxford, AL 
                                                 0 
                                       Appleton,WI 
                                                 0 
                                     Asheville, NC 
                                                 0 
                           Athens-Clark County, GA 
                                                 0 
                                 Atlantic City, NJ 
                                                 0 
                    Augusta-Richmond County, GA-SC 
                                                 0 
                             Austin-Round Rock, TX 
                                                 0 
                                   Bakersfield, CA 
                                                 0 
                              Baltimore-Towson, MD 
                                                 0 
                                        Bangor, ME 
                                                 0 
                                   Baton Rouge, LA 
                                                 0 
                          Beaumont-Port Author, TX 
                                                 0 
                                    Bellingham, WA 
                                                 0 
                                          Bend, OR 
                                                 0 
                                      Billings, MT 
                                                 0 
                                    Binghamton, NY 
                                                 0 
                             Birmingham-Hoover, AL 
                                                 0 
                             Bloomington-Normal IL 
                                                 0 
                                   Bloomington, IN 
                                                 0 
                              Boise City-Nampa, ID 
                                                 0 
                                       Boulder, CO 
                                                 0 
                                 Bowling Green, KY 
                                                 0 
                         Brownsville-Harlingen, TX 
                                                 0 
                         Buffalo-Niagara Falls, NY 
                                                 0 
                   Burlington-South Burlington, VT 
                                                 0 
                                  Cedar Rapids, IA 
                                                 0 
                              Champaign-Urbana, IL 
                                                 0 
                   Charleston-North Charleston, SC 
                                                 0 
                                    Charleston, WV 
                                                 0 
                                Chattanooga, TN-GA 
                                                 0 
                       Cleveland-Elyria-Mentor, OH 
                                                 0 
                                 Coeur d'Alene, ID 
                                                 0 
                              Colorado Springs, CO 
                                                 0 
                                      Columbia, MO 
                                                 0 
                                   Columbus, GA-AL 
                                                 0 
                                      Columbus, OH 
                                                 0 
                                Corpus Christi, TX 
                                                 0 
                                        Dayton, OH 
                                                 0 
                                       Decatur, Al 
                                                 0 
                                       Decatur, IL 
                                                 0 
            Deltona-Daytona Beach-Ormond Beach, FL 
                                                 0 
                                    Des Moines, IA 
                                                 0 
                        Detroit-Warren-Livonia, MI 
                                                 0 
                                         Dover, DE 
                                                 0 
                                     Duluth, MN-WI 
                                                 0 
                                        Durham, NC 
                                                 0 
                                    Eau Claire, WI 
                                                 0 
                                     El Centro, CA 
                                                 0 
                                       El Paso, TX 
                                                 0 
                                          Erie, PA 
                                                 0 
                            Eugene-Springfield, OR 
                                                 0 
                                 Evansville, IN-KY 
                                                 0 
                                      Fargo, ND-MN 
                                                 0 
                                    Farmington, NM 
                                                 0 
             Fayetteville-Springdale-Rogers, AR-MO 
                                                 0 
                                  Fayetteville, NC 
                                                 0 
                                         Flint, MI 
                                                 0 
                                      Florence, AL 
                                                 0 
                         Fort Collins-Loveland, CO 
                                                 0 
                                 Fort Smith, AR-OK 
                                                 0 
            Fort Walton Beach-Crestview-Destin, FL 
                                                 0 
                                    Fort Wayne, IN 
                                                 0 
                                        Fresno, CA 
                                                 0 
                                   Gainesville, FL 
                                                 0 
                          Grand Rapids-Wyoming, MI 
                                                 0 
                                       Greeley, CO 
                                                 0 
                                     Green Bay, WI 
                                                 0 
                         Greensboro-High Point, NC 
                                                 0 
                                    Greenville, SC 
                                                 0 
                               Gulfport-Biloxi, MS 
                                                 0 
                     Hagerstown-Martinsburg, MD-WV 
                                                 0 
                           Harrisburg-Carlisle, PA 
                                                 0 
                                  Harrisonburg, VA 
                                                 0 
                     Hickory-Morgantown-Lenoir, NC 
                                                 0 
                           Holland-Grand Haven, MI 
                                                 0 
                                      Honolulu, HI 
                                                 0 
                    Houston-Baytown-Sugar Land, TX 
                                                 0 
                      Huntington-Ashland, WV-KY-OH 
                                                 0 
                                    Huntsville, AL 
                                                 0 
                                  Indianapolis, IN 
                                                 0 
                                     Iowa City, IA 
                                                 0 
                                       Jackson, MI 
                                                 0 
                                       Jackson, MS 
                                                 0 
                                  Jacksonville, NC 
                                                 0 
                                    Janesville, WI 
                                                 0 
                                  Johnson City, TN 
                                                 0 
                                     Johnstown, PA 
                                                 0 
                                        Joplin, MO 
                                                 0 
                             Kalamazoo-Portage, MI 
                                                 0 
                              Kankakee-Bradley, IL 
                                                 0 
                      Killeen-Temple-Fort Hood, TX 
                                                 0 
                          Kingsport-Bristol, TN-VA 
                                                 0 
                                      Kingston, NY 
                                                 0 
                                     Knoxville, TN 
                                                 0 
                                     La Crosse, WI 
                                                 0 
                                     Lafayette, LA 
                                                 0 
                                  Lake Charles, LA 
                                                 0 
                         Lakeland-Winter Haven, FL 
                                                 0 
                                     Lancaster, PA 
                                                 0 
                          Lansing-East Lansing, MI 
                                                 0 
                                        Laredo, TX 
                                                 0 
                                    Las Cruses, NM 
                                                 0 
                            Las Vegas-Paradise, NV 
                                                 0 
                                      Lawrence, KS 
                                                 0 
                                        Lawton, OK 
                                                 0 
                             Lexington-Fayette, KY 
                                                 0 
                 Little Rock-North Little Rock, AR 
                                                 0 
                                      Longview, TX 
                                                 0 
                                       Lubbock, TX 
                                                 0 
                                     Lynchburg, VA 
                                                 0 
                                         Macon, GA 
                                                 0 
                                        Madera, CA 
                                                 0 
                                       Madison, WI 
                                                 0 
                        McAllen-Edinburg-Pharr, TX 
                                                 0 
                                       Medford, OR 
                                                 0 
                                 Memphis, TN-MS-AR 
                                                 0 
                                        Merced, CA 
                                                 0 
                        Michigan City-La Porte, IN 
                                                 0 
                                       Midland, TX 
                                                 0 
                 Milwaukee-Waukesha-West Allis, WI 
                                                 0 
                                        Mobile, AL 
                                                 0 
                                       Modesto, CA 
                                                 0 
                                        Monroe, MI 
                                                 0 
                        Muskegon-Norton Shores, MI 
                                                 0 
        Myrtle Beach-Conway-North Myrtle Beach, SC 
                                                 0 
                                          Napa, CA 
                                                 0 
                           Naples-Marco Island, FL 
                                                 0 
               Nashville-Davidson-Murfreesboro, TN 
                                                 0 
                                     New Haven, CT 
                                                 0 
                   New Orleans-Metairie-Kenner, LA 
                                                 0 
                           Niles-Benton Harbor, MI 
                                                 0 
                         Norwich-New London, CT-RI 
                                                 0 
                                         Ocala, FL 
                                                 0 
                                    Ocean City, NJ 
                                                 0 
                              Ogden-Clearfield, UT 
                                                 0 
                                 Oklahoma City, OK 
                                                 0 
                                       Olympia, WA 
                                                 0 
                       Omaha-Council Bluffs, NE-IA 
                                                 0 
                                Oshkosh-Neenah, WI 
                                                 0 
                 Palm Bay-Melbourne-Titusville, FL 
                                                 0 
                        Panama City-Lynn Haven, FL 
                                                 0 
                                        Peoria, IL 
                                                 0 
                                    Pittsburgh, PA 
                                                 0 
                    Port St. Lucie-Fort Pierce, FL 
                                                 0 
                       Portland-South Portland, ME 
                                                 0 
               Portland-Vancouver-Beaverton, OR-WA 
                                                 0 
              Poughkeepsie-Newburgh-Middletown, NY 
                                                 0 
                                      Prescott, AZ 
                                                 0 
                                    Provo-Orem, UT 
                                                 0 
                                        Pueblo, CO 
                                                 0 
                                   Punta Gorda, FL 
                                                 0 
                                  Raleigh-Cary, NC 
                                                 0 
                                       Reading, PA 
                                                 0 
                                   Reno-Sparks, NV 
                                                 0 
                                      Richmond, VA 
                                                 0 
                      Riverside-San Bernardino, CA 
                                                 0 
                                       Roanoke, VA 
                                                 0 
                            Rochester-Dover, NH-ME 
                                                 0 
                                      Rockford, IL 
                                                 0 
                Saginaw-Saginaw Township North, MI 
                                                 0 
                                       Salinas, CA 
                                                 0 
                                     Salisbury, MD 
                                                 0 
                                   San Antonio, TX 
                                                 0 
                 San Diego-Carlsbad-San Marcos, CA 
                                                 0 
                   San Luis Obispo-Paso Robles, CA 
                                                 0 
              Santa Barbara-Santa Maria-Goleta, CA 
                                                 0 
                                      Santa Fe, NM 
                                                 0 
                           Santa Rosa-Petaluma, CA 
                                                 0 
                        Santa-Cruz-Watsonville, CA 
                                                 0 
                     Sarasota-Bradenton-Venice, FL 
                                                 0 
                                      Savannah, GA 
                                                 0 
                         Scranton-Wilkes Barre, PA 
                                                 0 
                       Shreveport-Bossier City, LA 
                                                 0 
                                   Sioux Falls, SD 
                                                 0 
                       South Bend-Mishawaka, IN-MI 
                                                 0 
                                   Spartanburg, SC 
                                                 0 
                                       Spokane, WA 
                                                 0 
                                   Springfield, IL 
                                                 0 
                                Springfield, MA-CT 
                                                 0 
                                   Springfield, MO 
                                                 0 
                                   Springfield, OH 
                                                 0 
                                     St. Cloud, MN 
                                                 0 
                                  St. Louis, MO-IL 
                                                 0 
                                      Stockton, CA 
                                                 0 
                                      Syracuse, NY 
                                                 0 
                                   Tallahassee, FL 
                                                 0 
                                        Toledo, OH 
                                                 0 
                                        Topeka, KS 
                                                 0 
                                        Tucson, AZ 
                                                 0 
                                         Tulsa, OK 
                                                 0 
                                    Tuscaloosa, AL 
                                                 0 
                                    Utica-Rome, NY 
                                                 0 
                                      Valdosta, GA 
                                                 0 
                             Vallejo-Fairfield, CA 
                                                 0 
                                    Vero Beach, FL 
                                                 0 
                                      Victoria, TX 
                                                 0 
                  Vineland-Millville-Bridgeton, NJ 
                                                 0 
                           Visalia-Porterville, CA 
                                                 0 
                                          Waco, TX 
                                                 0 
                                 Warner Robins, GA 
                                                 0 
                          Waterloo-Cedar Falls, IA 
                                                 0 
                                        Wausau, WI 
                                                 0 
                                 Winston-Salem, NC 
                                                 0 
                                  Worcester, MA-CT 
                                                 0 
                                        Yakima, WA 
                                                 0 
                                  York-Hanover, PA 
                                                 0 
                    Youngstown-Warren-Boardman, OH 
                                                 0 
                                         Akron, OH 
                                                 1 
                                   Albuquerque, NM 
                                                 1 
                Atlanta-Sandy Springs-Marietta, GA 
                                                 1 
                          Bremerton-Silverdale, WA 
                                                 1 
                         Cape Coral-Fort Myers, FL 
                                                 1 
                                         Chico, CA 
                                                 1 
                   Cincinnati-Middletown, OH-KY-IN 
                                                 1 
                                 Denver-Aurora, CO 
                                                 1 
          Hartford-West Hartford-East Hartford, CT 
                                                 1 
                                Kansas City, MO-KS 
                                                 1 
                  Leominster-Fitchburg-Gardner, MA 
                                                 1 
                                 Louisville, KY-IN 
                                                 1 
            Minneapolis-St Paul-Bloomington, MN-WI 
                                                 1 
                                        Monroe, LA 
                                                 1 
                                    Montgomery, AL 
                                                 1 
                  Oxnard-Thousand Oaks-Ventura, CA 
                                                 1 
                    Pensacola-Ferry Pass-Brent, FL 
                                                 1 
                                        Racine, WI 
                                                 1 
                                     Rochester, NY 
                                                 1 
                                         Salem, OR 
                                                 1 
                San Jose-Sunnyvale-Santa Clara, CA 
                                                 1 
                       Seattle-Tacoma-Bellevue, WA 
                                                 1 
               Tampa-St. Petersburg-Clearwater, FL 
                                                 1 
                                 Trenton-Ewing, NJ 
                                                 1 
        Virginia Beach-Norfolk-Newport News, VA-NC 
                                                 1 
                                     Waterbury, CT 
                                                 1 
                                       Wichita, KS 
                                                 1 
                               Barnstable Town, MA 
                                                 2 
                 Charlotte-Gastonia-Concord, NC-SC 
                                                 2 
               Chicago-Naperville-Joliet, IN-IN-WI 
                                                 2 
                                      Columbia, SC 
                                                 2 
                   Dallas-Fort Worth-Arlington, TX 
                                                 2 
                                  Jacksonville, FL 
                                                 2 
                                       Orlando, FL 
                                                 2 
             Sacramento-Arden-Arcade-Roseville, CA 
                                                 2 
                              Canton-Massillon, OH 
                                                 3 
                       Phoenix-Mesa-Scottsdale, AZ 
                                                 3 
              Providence-Fall River-Warwick, MA-RI 
                                                 3 
                                Salt Lake City, UT 
                                                 3 
               Davenport-Moline-Rock Island, IA-IL 
                                                 4 
          Philadelphia-Camden-Wilmington, PA-NJ-DE 
                                                 4 
                                       Danbury, CT 
                                                 5 
                 San Francisco-Oakland-Fremont, CA 
                                                 6 
                   Bridgeport-Stamford-Norwalk, CT 
                                                 7 
New York-Northern New Jersey-Long Island, NY-NJ-PA 
                                                 7 
      Washington-Arlington-Alexandria, DC-VA-MD-WV 
                                                 8 
              Los Angeles-Long Beach-Santa Ana, CA 
                                                 9 
             Miami-Fort Lauderdale-Miami Beach, FL 
                                                16 
                    Boston-Cambridge-Quincy, MA-NH 
                                                18 

In Somalia?

  • Boston-Cambridge-Quincy, MA-NH
  • Minneapolis-St Paul-Bloomington, MN-WI
  • New York-Northern New Jersey-Long Island, NY-NJ-PA
  • Washington-Arlington-Alexandria, DC-VA-MD-WV
sort(tapply(CPS$Country == "Somalia", CPS$MetroArea, sum, na.rm=TRUE))
                                         Akron, OH 
                                                 0 
                       Albany-Schenectady-Troy, NY 
                                                 0 
                                        Albany, GA 
                                                 0 
                                   Albuquerque, NM 
                                                 0 
                 Allentown-Bethlehem-Easton, PA-NJ 
                                                 0 
                                       Altoona, PA 
                                                 0 
                                      Amarillo, TX 
                                                 0 
                                      Anderson, IN 
                                                 0 
                                      Anderson, SC 
                                                 0 
                                     Ann Arbor, MI 
                                                 0 
                               Anniston-Oxford, AL 
                                                 0 
                                       Appleton,WI 
                                                 0 
                                     Asheville, NC 
                                                 0 
                           Athens-Clark County, GA 
                                                 0 
                Atlanta-Sandy Springs-Marietta, GA 
                                                 0 
                                 Atlantic City, NJ 
                                                 0 
                    Augusta-Richmond County, GA-SC 
                                                 0 
                             Austin-Round Rock, TX 
                                                 0 
                                   Bakersfield, CA 
                                                 0 
                              Baltimore-Towson, MD 
                                                 0 
                                        Bangor, ME 
                                                 0 
                               Barnstable Town, MA 
                                                 0 
                                   Baton Rouge, LA 
                                                 0 
                          Beaumont-Port Author, TX 
                                                 0 
                                    Bellingham, WA 
                                                 0 
                                          Bend, OR 
                                                 0 
                                      Billings, MT 
                                                 0 
                                    Binghamton, NY 
                                                 0 
                             Birmingham-Hoover, AL 
                                                 0 
                             Bloomington-Normal IL 
                                                 0 
                                   Bloomington, IN 
                                                 0 
                              Boise City-Nampa, ID 
                                                 0 
                    Boston-Cambridge-Quincy, MA-NH 
                                                 0 
                                       Boulder, CO 
                                                 0 
                                 Bowling Green, KY 
                                                 0 
                          Bremerton-Silverdale, WA 
                                                 0 
                   Bridgeport-Stamford-Norwalk, CT 
                                                 0 
                         Brownsville-Harlingen, TX 
                                                 0 
                         Buffalo-Niagara Falls, NY 
                                                 0 
                              Canton-Massillon, OH 
                                                 0 
                         Cape Coral-Fort Myers, FL 
                                                 0 
                                  Cedar Rapids, IA 
                                                 0 
                              Champaign-Urbana, IL 
                                                 0 
                   Charleston-North Charleston, SC 
                                                 0 
                                    Charleston, WV 
                                                 0 
                 Charlotte-Gastonia-Concord, NC-SC 
                                                 0 
                                Chattanooga, TN-GA 
                                                 0 
               Chicago-Naperville-Joliet, IN-IN-WI 
                                                 0 
                                         Chico, CA 
                                                 0 
                   Cincinnati-Middletown, OH-KY-IN 
                                                 0 
                       Cleveland-Elyria-Mentor, OH 
                                                 0 
                                 Coeur d'Alene, ID 
                                                 0 
                              Colorado Springs, CO 
                                                 0 
                                      Columbia, MO 
                                                 0 
                                      Columbia, SC 
                                                 0 
                                   Columbus, GA-AL 
                                                 0 
                                Corpus Christi, TX 
                                                 0 
                   Dallas-Fort Worth-Arlington, TX 
                                                 0 
                                       Danbury, CT 
                                                 0 
               Davenport-Moline-Rock Island, IA-IL 
                                                 0 
                                       Decatur, Al 
                                                 0 
                                       Decatur, IL 
                                                 0 
            Deltona-Daytona Beach-Ormond Beach, FL 
                                                 0 
                                 Denver-Aurora, CO 
                                                 0 
                                    Des Moines, IA 
                                                 0 
                        Detroit-Warren-Livonia, MI 
                                                 0 
                                         Dover, DE 
                                                 0 
                                     Duluth, MN-WI 
                                                 0 
                                        Durham, NC 
                                                 0 
                                    Eau Claire, WI 
                                                 0 
                                     El Centro, CA 
                                                 0 
                                       El Paso, TX 
                                                 0 
                                          Erie, PA 
                                                 0 
                            Eugene-Springfield, OR 
                                                 0 
                                 Evansville, IN-KY 
                                                 0 
                                    Farmington, NM 
                                                 0 
             Fayetteville-Springdale-Rogers, AR-MO 
                                                 0 
                                  Fayetteville, NC 
                                                 0 
                                         Flint, MI 
                                                 0 
                                      Florence, AL 
                                                 0 
                         Fort Collins-Loveland, CO 
                                                 0 
                                 Fort Smith, AR-OK 
                                                 0 
            Fort Walton Beach-Crestview-Destin, FL 
                                                 0 
                                    Fort Wayne, IN 
                                                 0 
                                        Fresno, CA 
                                                 0 
                                   Gainesville, FL 
                                                 0 
                          Grand Rapids-Wyoming, MI 
                                                 0 
                                       Greeley, CO 
                                                 0 
                                     Green Bay, WI 
                                                 0 
                         Greensboro-High Point, NC 
                                                 0 
                                    Greenville, SC 
                                                 0 
                               Gulfport-Biloxi, MS 
                                                 0 
                     Hagerstown-Martinsburg, MD-WV 
                                                 0 
                           Harrisburg-Carlisle, PA 
                                                 0 
                                  Harrisonburg, VA 
                                                 0 
          Hartford-West Hartford-East Hartford, CT 
                                                 0 
                     Hickory-Morgantown-Lenoir, NC 
                                                 0 
                           Holland-Grand Haven, MI 
                                                 0 
                                      Honolulu, HI 
                                                 0 
                      Huntington-Ashland, WV-KY-OH 
                                                 0 
                                    Huntsville, AL 
                                                 0 
                                  Indianapolis, IN 
                                                 0 
                                     Iowa City, IA 
                                                 0 
                                       Jackson, MI 
                                                 0 
                                       Jackson, MS 
                                                 0 
                                  Jacksonville, FL 
                                                 0 
                                  Jacksonville, NC 
                                                 0 
                                    Janesville, WI 
                                                 0 
                                  Johnson City, TN 
                                                 0 
                                     Johnstown, PA 
                                                 0 
                                        Joplin, MO 
                                                 0 
                             Kalamazoo-Portage, MI 
                                                 0 
                              Kankakee-Bradley, IL 
                                                 0 
                                Kansas City, MO-KS 
                                                 0 
                      Killeen-Temple-Fort Hood, TX 
                                                 0 
                          Kingsport-Bristol, TN-VA 
                                                 0 
                                      Kingston, NY 
                                                 0 
                                     Knoxville, TN 
                                                 0 
                                     La Crosse, WI 
                                                 0 
                                     Lafayette, LA 
                                                 0 
                                  Lake Charles, LA 
                                                 0 
                         Lakeland-Winter Haven, FL 
                                                 0 
                                     Lancaster, PA 
                                                 0 
                          Lansing-East Lansing, MI 
                                                 0 
                                        Laredo, TX 
                                                 0 
                                    Las Cruses, NM 
                                                 0 
                            Las Vegas-Paradise, NV 
                                                 0 
                                      Lawrence, KS 
                                                 0 
                                        Lawton, OK 
                                                 0 
                  Leominster-Fitchburg-Gardner, MA 
                                                 0 
                             Lexington-Fayette, KY 
                                                 0 
                 Little Rock-North Little Rock, AR 
                                                 0 
                                      Longview, TX 
                                                 0 
              Los Angeles-Long Beach-Santa Ana, CA 
                                                 0 
                                 Louisville, KY-IN 
                                                 0 
                                       Lubbock, TX 
                                                 0 
                                     Lynchburg, VA 
                                                 0 
                                         Macon, GA 
                                                 0 
                                        Madera, CA 
                                                 0 
                                       Madison, WI 
                                                 0 
                        McAllen-Edinburg-Pharr, TX 
                                                 0 
                                       Medford, OR 
                                                 0 
                                 Memphis, TN-MS-AR 
                                                 0 
                                        Merced, CA 
                                                 0 
             Miami-Fort Lauderdale-Miami Beach, FL 
                                                 0 
                        Michigan City-La Porte, IN 
                                                 0 
                                       Midland, TX 
                                                 0 
                 Milwaukee-Waukesha-West Allis, WI 
                                                 0 
                                        Mobile, AL 
                                                 0 
                                       Modesto, CA 
                                                 0 
                                        Monroe, LA 
                                                 0 
                                        Monroe, MI 
                                                 0 
                                    Montgomery, AL 
                                                 0 
                        Muskegon-Norton Shores, MI 
                                                 0 
        Myrtle Beach-Conway-North Myrtle Beach, SC 
                                                 0 
                                          Napa, CA 
                                                 0 
                           Naples-Marco Island, FL 
                                                 0 
               Nashville-Davidson-Murfreesboro, TN 
                                                 0 
                                     New Haven, CT 
                                                 0 
                   New Orleans-Metairie-Kenner, LA 
                                                 0 
New York-Northern New Jersey-Long Island, NY-NJ-PA 
                                                 0 
                           Niles-Benton Harbor, MI 
                                                 0 
                         Norwich-New London, CT-RI 
                                                 0 
                                         Ocala, FL 
                                                 0 
                                    Ocean City, NJ 
                                                 0 
                              Ogden-Clearfield, UT 
                                                 0 
                                 Oklahoma City, OK 
                                                 0 
                                       Olympia, WA 
                                                 0 
                       Omaha-Council Bluffs, NE-IA 
                                                 0 
                                       Orlando, FL 
                                                 0 
                                Oshkosh-Neenah, WI 
                                                 0 
                  Oxnard-Thousand Oaks-Ventura, CA 
                                                 0 
                 Palm Bay-Melbourne-Titusville, FL 
                                                 0 
                        Panama City-Lynn Haven, FL 
                                                 0 
                    Pensacola-Ferry Pass-Brent, FL 
                                                 0 
                                        Peoria, IL 
                                                 0 
          Philadelphia-Camden-Wilmington, PA-NJ-DE 
                                                 0 
                                    Pittsburgh, PA 
                                                 0 
                    Port St. Lucie-Fort Pierce, FL 
                                                 0 
              Poughkeepsie-Newburgh-Middletown, NY 
                                                 0 
                                      Prescott, AZ 
                                                 0 
              Providence-Fall River-Warwick, MA-RI 
                                                 0 
                                    Provo-Orem, UT 
                                                 0 
                                        Pueblo, CO 
                                                 0 
                                   Punta Gorda, FL 
                                                 0 
                                        Racine, WI 
                                                 0 
                                  Raleigh-Cary, NC 
                                                 0 
                                       Reading, PA 
                                                 0 
                                   Reno-Sparks, NV 
                                                 0 
                      Riverside-San Bernardino, CA 
                                                 0 
                                       Roanoke, VA 
                                                 0 
                            Rochester-Dover, NH-ME 
                                                 0 
                                     Rochester, NY 
                                                 0 
                                      Rockford, IL 
                                                 0 
             Sacramento-Arden-Arcade-Roseville, CA 
                                                 0 
                Saginaw-Saginaw Township North, MI 
                                                 0 
                                         Salem, OR 
                                                 0 
                                       Salinas, CA 
                                                 0 
                                     Salisbury, MD 
                                                 0 
                                Salt Lake City, UT 
                                                 0 
                                   San Antonio, TX 
                                                 0 
                 San Diego-Carlsbad-San Marcos, CA 
                                                 0 
                 San Francisco-Oakland-Fremont, CA 
                                                 0 
                San Jose-Sunnyvale-Santa Clara, CA 
                                                 0 
                   San Luis Obispo-Paso Robles, CA 
                                                 0 
              Santa Barbara-Santa Maria-Goleta, CA 
                                                 0 
                                      Santa Fe, NM 
                                                 0 
                           Santa Rosa-Petaluma, CA 
                                                 0 
                        Santa-Cruz-Watsonville, CA 
                                                 0 
                     Sarasota-Bradenton-Venice, FL 
                                                 0 
                                      Savannah, GA 
                                                 0 
                         Scranton-Wilkes Barre, PA 
                                                 0 
                       Shreveport-Bossier City, LA 
                                                 0 
                       South Bend-Mishawaka, IN-MI 
                                                 0 
                                   Spartanburg, SC 
                                                 0 
                                       Spokane, WA 
                                                 0 
                                   Springfield, IL 
                                                 0 
                                Springfield, MA-CT 
                                                 0 
                                   Springfield, MO 
                                                 0 
                                   Springfield, OH 
                                                 0 
                                  St. Louis, MO-IL 
                                                 0 
                                      Stockton, CA 
                                                 0 
                                      Syracuse, NY 
                                                 0 
                                   Tallahassee, FL 
                                                 0 
               Tampa-St. Petersburg-Clearwater, FL 
                                                 0 
                                        Toledo, OH 
                                                 0 
                                        Topeka, KS 
                                                 0 
                                 Trenton-Ewing, NJ 
                                                 0 
                                        Tucson, AZ 
                                                 0 
                                         Tulsa, OK 
                                                 0 
                                    Tuscaloosa, AL 
                                                 0 
                                    Utica-Rome, NY 
                                                 0 
                                      Valdosta, GA 
                                                 0 
                             Vallejo-Fairfield, CA 
                                                 0 
                                    Vero Beach, FL 
                                                 0 
                                      Victoria, TX 
                                                 0 
                  Vineland-Millville-Bridgeton, NJ 
                                                 0 
        Virginia Beach-Norfolk-Newport News, VA-NC 
                                                 0 
                           Visalia-Porterville, CA 
                                                 0 
                                          Waco, TX 
                                                 0 
                                 Warner Robins, GA 
                                                 0 
      Washington-Arlington-Alexandria, DC-VA-MD-WV 
                                                 0 
                                     Waterbury, CT 
                                                 0 
                          Waterloo-Cedar Falls, IA 
                                                 0 
                                        Wausau, WI 
                                                 0 
                                       Wichita, KS 
                                                 0 
                                 Winston-Salem, NC 
                                                 0 
                                  Worcester, MA-CT 
                                                 0 
                                        Yakima, WA 
                                                 0 
                                  York-Hanover, PA 
                                                 0 
                    Youngstown-Warren-Boardman, OH 
                                                 0 
                                        Dayton, OH 
                                                 1 
                                      Richmond, VA 
                                                 1 
                    Houston-Baytown-Sugar Land, TX 
                                                 2 
                                   Sioux Falls, SD 
                                                 2 
                   Burlington-South Burlington, VT 
                                                 3 
                       Portland-South Portland, ME 
                                                 3 
               Portland-Vancouver-Beaverton, OR-WA 
                                                 3 
                                      Columbus, OH 
                                                 5 
                                      Fargo, ND-MN 
                                                 5 
                       Phoenix-Mesa-Scottsdale, AZ 
                                                 7 
                       Seattle-Tacoma-Bellevue, WA 
                                                 7 
                                     St. Cloud, MN 
                                                 7 
            Minneapolis-St Paul-Bloomington, MN-WI 
                                                17 
---
title: "AS1-3 Demographics and Employment in the United States"
author: "<name> <student ID>"
output: html_notebook
---

- - -
In the wake of the Great Recession of 2009, there has been a good deal of focus on employment statistics, one of the most important metrics policymakers use to gauge the overall strength of the economy. In the United States, the government measures unemployment using the Current Population Survey (CPS), which collects demographic and employment information from a wide range of Americans each month. In this exercise, we will employ the topics reviewed in the lectures as well as a few new techniques using the September 2013 version of this rich, nationally representative dataset (available online).

The observations in the dataset represent people surveyed in the September 2013 CPS who actually completed a survey. While the full dataset has 385 variables, in this exercise we will use a more compact version of the dataset, CPSData.csv, which has the following variables:

PeopleInHousehold: The number of people in the interviewee's household.

Region: The census region where the interviewee lives.

State: The state where the interviewee lives.

MetroAreaCode: A code that identifies the metropolitan area in which the interviewee lives (missing if the interviewee does not live in a metropolitan area). The mapping from codes to names of metropolitan areas is provided in the file MetroAreaCodes.csv.

Age: The age, in years, of the interviewee. 80 represents people aged 80-84, and 85 represents people aged 85 and higher.

Married: The marriage status of the interviewee.

Sex: The sex of the interviewee.

Education: The maximum level of education obtained by the interviewee.

Race: The race of the interviewee.

Hispanic: Whether the interviewee is of Hispanic ethnicity.

CountryOfBirthCode: A code identifying the country of birth of the interviewee. The mapping from codes to names of countries is provided in the file CountryCodes.csv.

Citizenship: The United States citizenship status of the interviewee.

EmploymentStatus: The status of employment of the interviewee.

Industry: The industry of employment of the interviewee (only available if they are employed).


### Section 1 - Loading and Summarizing the Dataset

#### 1.1 
Load the dataset from CPSData.csv into a data frame called CPS, and view the dataset with the summary() and str() commands.

```{r}
CPS = read.csv("Unit1/CPSData.csv")
summary(CPS)
str(CPS)
```


#### 1.2 
Among the interviewees with a value reported for the Industry variable, what is the most common industry of employment? Please enter the name exactly how you see it.
```{r}
ANSWER: Educational and health services 
```


#### 1.3 
Recall from the homework assignment "The Analytical Detective" that you can call the sort() function on the output of the table() function to obtain a sorted breakdown of a variable. For instance, sort(table(CPS$Region)) sorts the regions by the number of interviewees from that region.

Which state has the fewest interviewees?

```{r}
sort(table(CPS$Region))

ANSWER: Northeast
```

Which state has the largest number of interviewees?

```{r}
ANSWER: South
```


#### 1.4 
What proportion of interviewees are citizens of the United States?
```{r}
table(CPS$Citizenship)
7590/(116639+7073)

ANSWER:0.06135217
```

#### 1.5 
The CPS differentiates between race (with possible values American Indian, Asian, Black, Pacific Islander, White, or Multiracial) and ethnicity. A number of interviewees are of Hispanic ethnicity, as captured by the Hispanic variable. For which races are there at least 250 interviewees in the CPS dataset of Hispanic ethnicity? (Select all that apply.)

+ American Indian
+ Asian
+ Black
+ Multiracial
+ Pacific Islander
+ White

```{r}
table(CPS$Race,CPS$Hispanic)

ANSWER:American Indian,Black,Multiracial,White
```


### Section 2 - Evaluating Missing Values

#### 2.1

Which variables have at least one interviewee with a missing (NA) value? (Select all that apply.)

+ PeopleInHousehold
+ Region
+ State
+ MetroAreaCode
+ Age
+ Married
+ Sex
+ Education
+ Race
+ Hispanic
+ CountryOfBirthCode
+ Citizenship
+ EmploymentStatus
+ Industry

```{r}
summary(CPS)

ANSWER:MetroAreaCode,Married,Education,EmploymentStatus,Industry
```


#### 2.2 

Often when evaluating a new dataset, we try to identify if there is a pattern in the missing values in the dataset. We will try to determine if there is a pattern in the missing values of the Married variable. The function   

    is.na(CPS$Married) 

returns a vector of TRUE/FALSE values for whether the Married variable is missing. We can see the breakdown of whether Married is missing based on the reported value of the Region variable with the function 

    table(CPS$Region, is.na(CPS$Married))

Which is the most accurate:

+ The Married variable being missing is related to the Region value for the interviewee.
+ The Married variable being missing is related to the Sex value for the interviewee.
+ The Married variable being missing is related to the Age value for the interviewee.
+ The Married variable being missing is related to the Citizenship value for the interviewee.
+ The Married variable being missing is not related to the Region, Sex, Age, or Citizenship value for the interviewee.

```{r}
ANSWER:
The Married variable being missing is related to the Age value for the interviewee.
```


#### 2.3
As mentioned in the variable descriptions, MetroAreaCode is missing if an interviewee does not live in a metropolitan area. Using the same technique as in the previous question, answer the following questions about people who live in non-metropolitan areas.

How many states had all interviewees living in a non-metropolitan area (aka they have a missing MetroAreaCode value)? For this question, treat the District of Columbia as a state (even though it is not technically a state).


```{r}
is.na(CPS$MetroAreaCode)
table(CPS$State, is.na(CPS$MetroAreaCode))

ANSWER: 
Two states had all interviewees living in a non-metropolitan area.
```


How many states had all interviewees living in a metropolitan area? Again, treat the District of Columbia as a state.

```{r}
ANSWER: Three states had all interviewees living in a metropolitan area.
```

#### 2.4 
Which region of the United States has the largest proportion of interviewees living in a non-metropolitan area?

+ Midwest
+ Northeast
+ South
+ West

```{r}
is.na(CPS$MetroAreaCode)
table(CPS$Region, is.na(CPS$MetroAreaCode))

10674/(10674+20010)
5609/(5609+20330)
9871/(9871+31631)
8084/(8084+25093)
ANSWER:Midwest
```

#### 2.5 
While we were able to use the table() command to compute the proportion of interviewees from each region not living in a metropolitan area, it was somewhat tedious (it involved manually computing the proportion for each region) and isn't something you would want to do if there were a larger number of options. It turns out there is a less tedious way to compute the proportion of values that are TRUE. The mean() function, which takes the average of the values passed to it, will treat TRUE as 1 and FALSE as 0, meaning it returns the proportion of values that are true. For instance, mean(c(TRUE, FALSE, TRUE, TRUE)) returns 0.75. Knowing this, use tapply() with the mean function to answer the following questions:

Which state has a proportion of interviewees living in a non-metropolitan area closest to 30%?

```{r}
tapply(is.na(CPS$MetroAreaCode), CPS$State, mean)
sort(tapply(is.na(CPS$MetroAreaCode), CPS$State, mean))

ANSWER:Wisconsin

```


Which state has the largest proportion of non-metropolitan interviewees, ignoring states where all interviewees were non-metropolitan?


```{r}
Montana
```

### Section 3 - Integrating Metropolitan Area Data

Codes like MetroAreaCode and CountryOfBirthCode are a compact way to encode factor variables with text as their possible values, and they are therefore quite common in survey datasets. In fact, all but one of the variables in this dataset were actually stored by a numeric code in the original CPS datafile.

When analyzing a variable stored by a numeric code, we will often want to convert it into the values the codes represent. To do this, we will use a dictionary, which maps the the code to the actual value of the variable. We have provided dictionaries MetroAreaCodes.csv and CountryCodes.csv, which respectively map MetroAreaCode and CountryOfBirthCode into their true values. Read these two dictionaries into data frames MetroAreaMap and CountryMap.

#### 3.1

How many observations (codes for metropolitan areas) are there in MetroAreaMap?

```{r}
MetroAreaMap = read.csv("Unit1/MetroAreaCodes.csv")
CountryMap = read.csv("Unit1/CountryCodes.csv")
str(MetroAreaMap)

ANSWER:271
```

How many observations (codes for countries) are there in CountryMap?

```{r}
str(CountryMap)
ANSWER:149
```


#### 3.2
To merge in the metropolitan areas, we want to connect the field MetroAreaCode from the CPS data frame with the field Code in MetroAreaMap. The following command merges the two data frames on these columns, overwriting the CPS data frame with the result:

    CPS = merge(CPS, MetroAreaMap, by.x="MetroAreaCode", by.y="Code", all.x=TRUE)

The first two arguments determine the data frames to be merged (they are called "x" and "y", respectively, in the subsequent parameters to the merge function). by.x="MetroAreaCode" means we're matching on the MetroAreaCode variable from the "x" data frame (CPS), while by.y="Code" means we're matching on the Code variable from the "y" data frame (MetroAreaMap). Finally, all.x=TRUE means we want to keep all rows from the "x" data frame (CPS), even if some of the rows' MetroAreaCode doesn't match any codes in MetroAreaMap (for those familiar with database terminology, this parameter makes the operation a left outer join instead of an inner join).

Review the new version of the CPS data frame with the summary() and str() functions. What is the name of the variable that was added to the data frame by the merge() operation?


```{r}
   CPS = merge(CPS, MetroAreaMap, by.x="MetroAreaCode", by.y="Code", all.x=TRUE)
summary(CPS)
str(CPS)

ANSWER:MetroArea
```

How many interviewees have a missing value for the new metropolitan area variable? Note that all of these interviewees would have been removed from the merged data frame if we did not include the all.x=TRUE parameter.

```{r}
summary(CPS)
ANSWER:34238
```


#### 3.3
Which of the following metropolitan areas has the largest number of interviewees?

+ Atlanta-Sandy Springs-Marietta, GA
+ Baltimore-Towson, MD
+ Boston-Cambridge-Quincy, MA-NH
+ San Francisco-Oakland-Fremont, CA

```{r}
table(CPS$MetroArea)
sort(table(CPS$MetroArea))

ANSWER:Boston-Cambridge-Quincy, MA-NH

```

#### 3.4
Which metropolitan area has the highest proportion of interviewees of Hispanic ethnicity? Hint: Use tapply() with mean, as in the previous subproblem. Calling sort() on the output of tapply() could also be helpful here.


```{r}
sort(tapply(CPS$Hispanic,CPS$MetroArea,mean))
ANSWER:Laredo, TX (0.966292135)
```


#### 3.5
Remembering that CPS$Race == "Asian" returns a TRUE/FALSE vector of whether an interviewee is Asian, determine the number of metropolitan areas in the United States from which at least 20% of interviewees are Asian.

```{r}
sort(tapply(CPS$Race == "Asian",CPS$MetroArea,mean))

ANSWER:
Vallejo-Fairfield,
San Jose-Sunnyvale-Santa Clara, CA
San Francisco-Oakland-Fremont, CA
Honolulu, HI
```


#### 3.6
Normally, we would look at the sorted proportion of interviewees from each metropolitan area who have not received a high school diploma with the command:

    sort(tapply(CPS$Education == "No high school diploma", CPS$MetroArea, mean))

However, none of the interviewees aged 14 and younger have an education value reported, so the mean value is reported as NA for each metropolitan area. To get mean (and related functions, like sum) to ignore missing values, you can pass the parameter na.rm=TRUE. Passing na.rm=TRUE to the tapply function, determine which metropolitan area has the smallest proportion of interviewees who have received no high school diploma.

### Section 4 - Integrating Country of Birth Data

Just as we did with the metropolitan area information, merge in the country of birth information from the CountryMap data frame, replacing the CPS data frame with the result. If you accidentally overwrite CPS with the wrong values, remember that you can restore it by re-loading the data frame from CPSData.csv and then merging in the metropolitan area information using the command provided in the previous subproblem.

#### 4.1
What is the name of the variable added to the CPS data frame by this merge operation?

```{r}
CPS = merge(CPS, CountryMap, by.x="CountryOfBirthCode", by.y="Code", all.x=TRUE)
summary(CPS)
ANSWER:Country
```

How many interviewees have a missing value for the new country of birth variable?

```{r}
summary(CPS)
ANSWER:176
```

#### 4.2 
Among all interviewees born outside of North America, which country was the most common place of birth?

```{r}
sort(summary(CPS$Country))
ANSWER:Philippines
```

#### 4.3
What proportion of the interviewees from the "New York-Northern New Jersey-Long Island, NY-NJ-PA" metropolitan area have a country of birth that is not the United States? For this computation, don't include people from this metropolitan area who have a missing country of birth.


```{r}
table(CPS$MetroArea == "New York-Northern New Jersey-Long Island, NY-NJ-PA", CPS$Country != "United States")
1668/(1668+3736)
```


#### 4.4
Which metropolitan area has the largest number (note -- not proportion) of interviewees with a country of birth in India? Hint -- remember to include na.rm=TRUE if you are using tapply() to answer this question.

+ Boston-Cambridge-Quincy, MA-NH
+ Minneapolis-St Paul-Bloomington, MN-WI
+ New York-Northern New Jersey-Long Island, NY-NJ-PA
+ Washington-Arlington-Alexandria, DC-VA-MD-WV

```{r}
sort(tapply(CPS$Country == "India", CPS$MetroArea, sum, na.rm=TRUE))

ANSWER:New York-Northern New Jersey-Long Island, NY-NJ-PA 

```

In Brazil?

+ Boston-Cambridge-Quincy, MA-NH
+ Minneapolis-St Paul-Bloomington, MN-WI
+ New York-Northern New Jersey-Long Island, NY-NJ-PA
+ Washington-Arlington-Alexandria, DC-VA-MD-WV

```{r}
sort(tapply(CPS$Country == "Brazil", CPS$MetroArea, sum, na.rm=TRUE))

ANSWER:Boston-Cambridge-Quincy, MA-NH 

```

In Somalia?

+ Boston-Cambridge-Quincy, MA-NH
+ Minneapolis-St Paul-Bloomington, MN-WI
+ New York-Northern New Jersey-Long Island, NY-NJ-PA
+ Washington-Arlington-Alexandria, DC-VA-MD-WV

```{r}
sort(tapply(CPS$Country == "Somalia", CPS$MetroArea, sum, na.rm=TRUE))

ANSWER:Minneapolis-St Paul-Bloomington, MN-WI 

```






