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Epi (version 2.56)

subset.Lexis: Subsetting Lexis (and stacked.Lexis) objects

Description

Return subsets of Lexis objects which meet conditions

Usage

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

Value

A Lexis object with selected rows and columns.

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.

Author

Martyn Plummer

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.

See Also

Lexis, merge.Lexis, bootLexis