setwd
{base}
Set Working Directory
ifelse
{base}
Return a or b depending on the value of test
attach
{base}
Attach Set of R Objects to Search Path
library
{base}
Load an R package
summary
{base}
Obtain summary statistics or detailed regression output
read_dta
{haven}
Read a .dta file (Stata data)
lm
{base}
Fit a linear model
The end!