Epi: subset.Lexis – R documentation

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Epi

subset.Lexis

Subsetting Lexis (and stacked.Lexis) objects

Description

Return subsets of Lexis objects which meet conditions

Usage

## S3 method for class 'Lexis'
subset(x, ...)
## S3 method for class 'Lexis'
x[...]
## S3 method for class 'stacked.Lexis'
subset(x, ...)

Arguments

`x`	an object of class `Lexis`
`...`	additional arguments to be passed to `subset.data.frame`. This will normally be some logical expression selecting a subset of the rows. For details see `subset.data.frame`.

Details

The subset method for Lexis objects works exactly as the method for data frames. So does the "[" method. The special methods are needed in order to propagate the Lexis-specific attributes.

The method for stacked.Lexis objects also shrinks the set of levels for lex.Cst and lex.Xst to those actually occurring in the resulting data frame.

Value

A Lexis object with selected rows and columns.

Author(s)

Martyn Plummer