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

In doBy: Groupwise Statistics, LSmeans, Linear Estimates, Utilities

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

Description

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.

Usage

subset_by(data, formula, subset, select, drop = FALSE, join = TRUE, ...)

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

Arguments

data	A data frame.
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.
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.

Value

A data frame.

Author(s)

Søren Højsgaard, [e-mail]

See Also

splitBy, split_by

Examples

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

doBy documentation built on Oct. 8, 2024, 1:06 a.m.