R Markdown

This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see http://rmarkdown.rstudio.com.

When you click the Knit button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:

setwd("c:/AGZ1/GD_AGZ1117/AGZ_Home/workspace_R")
list.files()
##  [1] "-azhang1-2.Rhistory"                 
##  [2] "-azhang1.Rhistory"                   
##  [3] "-azhang3.Rhistory"                   
##  [4] "2015_03_19 DataKindHackson-azhang1.R"
##  [5] "2015_03_19 DataKindHackson.R"        
##  [6] "BeginningR.html"                     
##  [7] "BeginningR.Rmd"                      
##  [8] "Cell.Rmd"                            
##  [9] "Cell1.html"                          
## [10] "Cell1.Rmd"                           
## [11] "Class2Ex_GetStarted.knit.md"         
## [12] "Cousera_Duket.R"                     
## [13] "Cousera_JHU"                         
## [14] "data"                                
## [15] "data-wrangling-cheatsheet.pdf"       
## [16] "devtools-cheatsheet.pdf"             
## [17] "Ebola_Outbreak.csv"                  
## [18] "genia"                               
## [19] "git_bitbucket_tutorial"              
## [20] "h20.R"                               
## [21] "Hardy"                               
## [22] "Lecture2_GettingStartedWith.R"       
## [23] "Lecture5_Visualization.R"            
## [24] "ML_Homework1.Rmd"                    
## [25] "myfile"                              
## [26] "pres1.csv"                           
## [27] "projects"                            
## [28] "R in Action.R"                       
## [29] "README.md"                           
## [30] "RforRPC.Rmd"                         
## [31] "RforRPC_files"                       
## [32] "rmarkdown-cheatsheet.pdf"            
## [33] "rmarkdown-reference-guide (1).pdf"   
## [34] "Safari"                              
## [35] "Safari_Jared Lander.R"               
## [36] "Safari_Jared Lander.Rmd"             
## [37] "Shiny"                               
## [38] "shiny-cheatsheet.pdf"                
## [39] "test-azhang3.R"                      
## [40] "test.R"                              
## [41] "test.R.out"                          
## [42] "tutorial"                            
## [43] "UCSC"                                
## [44] "UCSC_Intro_DataAnalysis-azhang1.R"   
## [45] "USCounties_df_name.csv"              
## [46] "USCounties_df_new.csv"               
## [47] "USCounties_df_new.Rda"               
## [48] "USCounties_name.csv"                 
## [49] "USCounties_new.csv"                  
## [50] "USCounties_new.Rda"                  
## [51] "USP.Rdata"                           
## [52] "USPresidents.csv"                    
## [53] "x.Rda"                               
## [54] "x.Rds"
getwd()
## [1] "c:/AGZ1/GD_AGZ1117/AGZ_Home/workspace_R"
HW1_US_Counties <- read.csv("data/HW1_US_Counties.csv",  stringsAsFactors = FALSE)
#verify:
dim(HW1_US_Counties)
## [1] 3144   16
names(HW1_US_Counties)
##  [1] "STNAME"               "CTYNAME"              "SUMLEV"              
##  [4] "REGION"               "DIVISION"             "STATE"               
##  [7] "COUNTY"               "CENSUS2010POP"        "POPESTIMATE2013"     
## [10] "BIRTHS2013"           "DEATHS2013"           "NATURALINC2013"      
## [13] "INTERNATIONALMIG2013" "USPS"                 "ALAND_SQMI"          
## [16] "AWATER_SQMI"

Main Libraries

ggplot2

Statistics

Creating random numbers

summary(cars)
##      speed           dist       
##  Min.   : 4.0   Min.   :  2.00  
##  1st Qu.:12.0   1st Qu.: 26.00  
##  Median :15.0   Median : 36.00  
##  Mean   :15.4   Mean   : 42.98  
##  3rd Qu.:19.0   3rd Qu.: 56.00  
##  Max.   :25.0   Max.   :120.00

Including Plots

You can also embed plots, for example:

Note that the echo = FALSE parameter was added to the code chunk to prevent printing of the R code that generated the plot.