psyteachr_fqa Ch. 14

count()

{dplyr}

count unique values of variables

group_by()

{dplyr}

group data by levels of column

mutate()

{dplyr}

create or modify data columns

mean()

{base}

calculate mean of elements of vector

sd()

{stats}

compute standard deviation

round()

{base}

round values to specified number of digits

The end!