dplyr is a dataflow grammar created in 2012 by Hadley Wickham.
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git clone https://github.com/tidyverse/dplyr/dplyr is a grammar of data manipulation, providing a consistent set of verbs that help you solve the most common data manipulation challenges: mutate() adds new variables that are functions of existing variables. select() picks variables based on their names. filter() picks cases based on their values. summarise() reduces multiple values down to a single summary. arrange() changes the ordering of the rows.