POL 304: Using Data to Understand Politics and Society

POL 304: Using Data to Understand Politics and Society
Lab 1: Intro to R
Olga Chyzh [www.olgachyzh.com]
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Always Start By...

Navigating to your working directory

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And ...

Setting your directory

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Open Data Files

To open .csv files, use read.csv

rosca<-read.csv('rosca.csv', header=TRUE)

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Access/Create a New Variable

rosca$bg_female
rosca$new_var<- NA

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Subset Rows by Value

Suppose you want to see the values of the fol2_amtinvest variable only for women.

rosca$fol2_amtinvest[rosca$bg_female==1]
##Or create a copy of the dataset that only includes women:
rosca1<- rosca$fol2_amtinvest[rosca$bg_female==1]

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Calculate the Mean

mean(rosca$fol2_amtinvest, na.rm=TRUE)
mean(rosca$fol2_amtinvest[rosca$bg_female==1], na.rm=TRUE)
tapply(rosca$fol2_amtinvest, rosca$bg_female,mean, na.rm=TRUE)

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Tabulate Observations by Category

table(rosca$bg_female)

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Your Turn

Create a single variable treatment that takes the value control for observations that received only encouragement, safebox if received a safe box, and lockbox if receiving a locked box. How many individuals are in the control group? How many individuals are in each of the treatment groups?

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Challenge YourselfComplete the practice problem set posted on the course website.
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