x, 2 ) ) ) ) #> # A tibble: 6 × 3 #> # Groups: g #> g x y #> #> 1 b x 0.57 y 0.71 #> 2 c x 0.89 y 0.31 #> 3 b x 0.97 y 0.1 #> 4 a x 0.32 y 0.89 #> 5 c x 0.57 y 0.91 #> 6 c x 0.66 y 0. library(MASS) Load MASS for the cabbages data set library(dplyr) ca <- cabbages > groupby(Cult, Date) > summarise( Weight mean(HeadWt). The package dplyr is a fairly new (2014) package that tries to provide easy tools for the most common data manipulation tasks. I am trying to use dplyr to groupby var2 (A, B, and C) then count, and summarize the var1 by mean and sd. count () lets you quickly count the unique values of one or more variables: df > count (a, b) is roughly equivalent to df > groupby (a, b) > summarise (n n ()).
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