print()
readline()
paste()
cat()
gl()
subset()
summary()
if
if...else
else if
ifelse()
read.table()
read.csv()
read.csv2()
read_excel()
Xapply()
apply()
lapply()
sapply()
tapply()
dplyr
select()
ggplot2
sample()
set.seed()
ecdf()
.Rmd