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I’d seen my father. He was a poor man, and I watched him do astonishingthings. - Sidney Poitier

{poorman} is a grammar of data manipulation, providing dependency freeversions of{dplyr} verbs thathelp you solve the most common data manipulation challenges:

• select() picks variables based on their names.
• mutate() adds new variables that are functions of existingvariables.
• filter() picks cases based on their values.
• summarise() reduces multiple values down to a single summary.
• arrange() changes the ordering of the rows.

{poorman} attempts to replicate the {dplyr} API exactly such that your{dplyr} code will still run even if you use {poorman} in its place. Inaddition to replicating {dplyr} functionality, {poorman} implementsother functionality from the wider {tidyverse} such as select helpersand the pipe,%>%.

For more details on the functionality available within {poorman}, checkout the {poorman} series of blog postshere.

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You can install:

• the development version fromGitHub with

# install.packages("remotes")remotes::install_github("nathaneastwood/poorman")

• the latest release from CRAN with

install.packages("poorman")

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If you’d like to try out the latest version of the package on CRAN usingDocker, you can run the latest image with:

docker run --rm -it nathaneastwood/poorman

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library(poorman,warn.conflicts=FALSE)##   I'd seen my father. He was a poor man, and I watched him do astonishing things.#     - Sidney Poitiermtcars %>%  select(mpg,wt, starts_with("c")) %>%  mutate(kpl= (1.609*mpg)/3.785,wt_kg=wt*453.5924) %>%  filter(mpg>28)#                 mpg    wt cyl carb      kpl    wt_kg# Fiat 128       32.4 2.200   4    1 13.77321 997.9033# Honda Civic    30.4 1.615   4    2 12.92301 732.5517# Toyota Corolla 33.9 1.835   4    1 14.41086 832.3421# Lotus Europa   30.4 1.513   4    2 12.92301 686.2853mtcars %>%  group_by(am,cyl) %>%  summarise(mean_mpg= mean(mpg),sd_mpg= sd(mpg)) %>%  ungroup()#   am cyl mean_mpg    sd_mpg# 1  0   4 22.90000 1.4525839# 2  0   6 19.12500 1.6317169# 3  0   8 15.05000 2.7743959# 4  1   4 28.07500 4.4838599# 5  1   6 20.56667 0.7505553# 6  1   8 15.40000 0.5656854

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• {dplyr}
• {bplyr} - imports {magrittr} and{rlang}; it prepends functions withb_*(), e.g. b_select().
• {tbltools} - imports{magrittr} and appends*_data() to each of its functions,e.g. select_data().

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