R4DS Ch. 5

group_by()

{dplyr}

group data by levels of column

any_of()

{tidyselect}

check if any any elements are found in vector

filter()

{dplyr}

keep rows based on values of columns

arrange()

{dplyr}

change order of rows based on values of columns

count()

{dplyr}

count unique values of variables

ends_with()

{tidyselect}

match column names that end with string

rename()

{dplyr}

rename columns

desc()

{dplyr}

order in descending order

select()

{dplyr}

keep specified columns

ungroup()

{dplyr}

remove grouping

contains()

{tidyselect}

match column names that contain string

starts_with()

{tidyselect}

match column names that begin with string

summarize()

{dplyr}

summarize data usually by grouping variable

num_range()

{tidyselect}

match column names with number range

mutate()

{dplyr}

create or modify data columns

n()

{dplyr}

return current group size

The end!