SciencesPo (version 1.02.12)

keep: Subset data

Description

Subsets a data.frame based on variables or/and records. It is a version of subset.data.frame which is a standard R function.

Usage

keep(data, select, subset, drop = FALSE, refactor = c("subset.vars", "all",
  "none"), sample = NULL, ...)

Arguments

data

= .data

select

the columns to select from data.

subset

the elements or rows to keep from data (missing values are taken as false).

drop

passed on to [ indexing operator.

refactor

whether the levels of variable(s) with zero count should be removed after subsetting. The default is refactor="subset.vars", which means that the levels of the variables not being used will be recycled.

sample

an integer for the size of random sample to retain from the data.

...

typically unecessary parameters.

encoding

UTF-8

Examples

data(ssex)
info(ssex)
keep(ssex, select = c(Date, Oppose, Favor))

keep(ssex, subset=Oppose!="NA") # subset