R: Symmetric Interaction of Factors

Symm {gnm} | R Documentation

## Symmetric Interaction of Factors

### Description

`Symm` codes the symmetric interaction of factors having the same set of levels, for use in regression models of symmetry or quasi-symmetry.

### Usage

    Symm(...)

### Arguments

`...` | one or more factors.

### Value

A factor whose levels index the symmetric interaction of all factors supplied as input.

### Note

`Symm` relies on the gtools package from CRAN

### Author(s)

David Firth and Heather Turner

### See Also

`Diag`

### Examples

    row <- gl(4, 4, 16)
    col <- gl(4, 1, 16)
    symm4by4 <- Symm(row, col)
    matrix(symm4by4, 4, 4)

[Package gnm version 1.0-8 Index]