psyteachr_fqa Ch. 06

inner_join()

{dplyr}

join two data sets keeping the observations that they have in common

drop_na()

{tidyr}

drop rows containing missing values

sum()

{base}

sum elements of vector

sd()

{stats}

compute standard deviation

filter()

{dplyr}

keep rows based on values of columns

group_by()

{dplyr}

group data by levels of column

c()

{base}

create vector of numbers, characters, etc.

pivot_longer()

{tidyr}

pivot data frame to be longer

mutate()

{dplyr}

create or modify data columns

mean()

{base}

calculate mean of elements of vector

select()

{dplyr}

keep specified columns

pivot_wider()

{tidyr}

pivot data frame to be wider

The end!