HW1
Principles of Data Visualization and Introduction to ggplot2
I have provided you with data about the 5,000 fastest growing companies in the US, as compiled by Inc. magazine. lets read this in:
And lets preview this data:
head(inc)## Rank Name Growth_Rate Revenue
## 1 1 Fuhu 421.48 1.179e+08
## 2 2 FederalConference.com 248.31 4.960e+07
## 3 3 The HCI Group 245.45 2.550e+07
## 4 4 Bridger 233.08 1.900e+09
## 5 5 DataXu 213.37 8.700e+07
## 6 6 MileStone Community Builders 179.38 4.570e+07
## Industry Employees City State
## 1 Consumer Products & Services 104 El Segundo CA
## 2 Government Services 51 Dumfries VA
## 3 Health 132 Jacksonville FL
## 4 Energy 50 Addison TX
## 5 Advertising & Marketing 220 Boston MA
## 6 Real Estate 63 Austin TXsummary(inc)## Rank Name Growth_Rate
## Min. : 1 (Add)ventures : 1 Min. : 0.340
## 1st Qu.:1252 @Properties : 1 1st Qu.: 0.770
## Median :2502 1-Stop Translation USA: 1 Median : 1.420
## Mean :2502 110 Consulting : 1 Mean : 4.612
## 3rd Qu.:3751 11thStreetCoffee.com : 1 3rd Qu.: 3.290
## Max. :5000 123 Exteriors : 1 Max. :421.480
## (Other) :4995
## Revenue Industry Employees
## Min. :2.000e+06 IT Services : 733 Min. : 1.0
## 1st Qu.:5.100e+06 Business Products & Services: 482 1st Qu.: 25.0
## Median :1.090e+07 Advertising & Marketing : 471 Median : 53.0
## Mean :4.822e+07 Health : 355 Mean : 232.7
## 3rd Qu.:2.860e+07 Software : 342 3rd Qu.: 132.0
## Max. :1.010e+10 Financial Services : 260 Max. :66803.0
## (Other) :2358 NA's :12
## City State
## New York : 160 CA : 701
## Chicago : 90 TX : 387
## Austin : 88 NY : 311
## Houston : 76 VA : 283
## San Francisco: 75 FL : 282
## Atlanta : 74 IL : 273
## (Other) :4438 (Other):2764Think a bit on what these summaries mean. Use the space below to add some more relevant non-visual exploratory information you think helps you understand this data:
#find number of observations and variables in the dataset
glimpse(inc)## Observations: 5,001
## Variables: 8
## $ Rank <int> 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 1…
## $ Name <fct> Fuhu, FederalConference.com, The HCI Group, Bridger,…
## $ Growth_Rate <dbl> 421.48, 248.31, 245.45, 233.08, 213.37, 179.38, 174.…
## $ Revenue <dbl> 1.179e+08, 4.960e+07, 2.550e+07, 1.900e+09, 8.700e+0…
## $ Industry <fct> Consumer Products & Services, Government Services, H…
## $ Employees <int> 104, 51, 132, 50, 220, 63, 27, 75, 97, 15, 149, 165,…
## $ City <fct> El Segundo, Dumfries, Jacksonville, Addison, Boston,…
## $ State <fct> CA, VA, FL, TX, MA, TX, TN, CA, UT, RI, VA, CA, FL, …#getting the metrics about data types, zeros, infinite numbers, and missing values
df_status(inc)## variable q_zeros p_zeros q_na p_na q_inf p_inf type unique
## 1 Rank 0 0 0 0.00 0 0 integer 4999
## 2 Name 0 0 0 0.00 0 0 factor 5001
## 3 Growth_Rate 0 0 0 0.00 0 0 numeric 1147
## 4 Revenue 0 0 0 0.00 0 0 numeric 1069
## 5 Industry 0 0 0 0.00 0 0 factor 25
## 6 Employees 0 0 12 0.24 0 0 integer 691
## 7 City 0 0 0 0.00 0 0 factor 1519
## 8 State 0 0 0 0.00 0 0 factor 52Question 1
Create a graph that shows the distribution of companies in the dataset by State (ie how many are in each state). There are a lot of States, so consider which axis you should use. This visualization is ultimately going to be consumed on a ‘portrait’ oriented screen (ie taller than wide), which should further guide your layout choices.
#count number of companies in each state
companies <- inc %>% select(c('State', 'Name')) %>% count(c('State'))
head(companies)## State freq
## 1 AK 2
## 2 AL 51
## 3 AR 9
## 4 AZ 100
## 5 CA 701
## 6 CO 134#order states by number of companies
companies$State <- factor(companies$State, levels = companies$State[order(companies$freq)])#create graph
ggplot(data=companies, aes(x=State,y=freq)) +
geom_bar(position="dodge",stat="identity") +
labs(x="State", y = "Number of Companies") +
coord_flip() +
ggtitle("Distribution of companies by State")
Quesiton 2
Lets dig in on the state with the 3rd most companies in the data set. Imagine you work for the state and are interested in how many people are employed by companies in different industries. Create a plot that shows the average and/or median employment by industry for companies in this state (only use cases with full data, use R’s complete.cases() function.) In addition to this, your graph should show how variable the ranges are, and you should deal with outliers.
#find state with the 3rd most companies
third_state <- companies[order(-companies$freq),]
print(third_state$State[3])## [1] NY
## 52 Levels: PR AK WV WY SD MT NM VT HI AR ND MS ME DE RI ID NH NV NE ... CA#select data of the state with the 3rd most companies
third_state_companies <- subset(inc, State = third_state)
#ignore cases with missing data
third_state_companies <- third_state_companies[complete.cases(third_state_companies),]#create box plots
ggplot(third_state_companies, mapping = aes(x = reorder(Industry, Employees, FUN = "median"), y = Employees)) +
geom_boxplot(outlier.shape = NA) +
labs(x="Industry", y = "Number of Employees") +
ggtitle("Employment distribution by industry for companies
in the state with the 3rd most companies") +
coord_flip(ylim = c(0, 750))
Question 3
Now imagine you work for an investor and want to see which industries generate the most revenue per employee. Create a chart that makes this information clear. Once again, the distribution per industry should be shown.
#create box plots
ggplot(third_state_companies, mapping = aes(x = reorder(Industry, Revenue/Employees, FUN = "median"), y = Revenue/Employees)) +
geom_boxplot(outlier.shape = NA) +
labs(x = "Industry", y = "Revenue per employee") +
ggtitle("Industries generate the most revenue per employee in
the state with the 3rd most companies") +
coord_flip(ylim = c(0, 2000000))