R: Finds subsets of a dataframe which is split by variables in a...

by-subset {doBy}

R Documentation

Finds subsets of a dataframe which is split by variables in a formula.

A data frame is split by a formula into groups. Then subsets are found within each group, and the result is collected into a data frame.

subsetBy(formula, subset, data = parent.frame(), select, drop = FALSE,
  join = TRUE, ...)

`formula`	A right hand sided formula or a character vector of variables to split by.
`subset`	logical expression indicating elements or rows to keep: missing values are taken as false.
`data`	A data frame.
`select`	expression, indicating columns to select from a data frame.
`drop`	passed on to `[` indexing operator.
`join`	If FALSE the result is a list of data frames (as defined by 'formula'); if TRUE one data frame is returned.
`...`	further arguments to be passed to or from other methods.

A data frame.

Søren Højsgaard, sorenh@math.aau.dk


data(dietox)
subsetBy(~Evit, Weight < mean(Weight), data=dietox)

[Package doBy version 4.6-2 Index]