Introductory Stata 17: Mean Comparison (ttest)

The mean of a variable is an important statistic. We often compare the variable means between different groups, such as whether the average wage of male workers is statistically different from that of female workers. In this video, we will explore how to do it in Stata.

*******************
*17. Mean Testing *
*******************
capture log close

describe
summarize

*Test whether the mean of wage is different from 7
summarize wage

ttest wage=7

*Test whether the mean of wage differs by marital status
tabulate married
tabulate married, nolabel

bysort married: summarize(wage)

ttest wage, by(married)

ttest wage, by(union)

*Graph wage means by categorical variables
grmeanby married union, summarize(wage)

log close

#ttest #grmeanby #Stata