R: Subsetting Lexis (and stacked.Lexis) objects

subset.Lexis {Epi} | R Documentation

## 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

### See Also

`Lexis`, `merge.Lexis`, `bootLexis`

[Package Epi version 2.42 Index]