gnm: Symm – R documentation

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Symm

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(..., separator = ":")

Arguments

`...`	one or more factors.
`separator`	a character string of length 1 or more, to be used in naming the levels of the resulting interaction factor.

Value

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

Author(s)

David Firth and Heather Turner

Examples

rowfac <- gl(4, 4, 16)
colfac <- gl(4, 1, 16)
symm4by4 <- Symm(rowfac, colfac)
matrix(symm4by4, 4, 4)

gnm

Generalized Nonlinear Models

v1.1-1

GPL-2 | GPL-3

Authors

Heather Turner [aut, cre] (<https://orcid.org/0000-0002-1256-3375>), David Firth [aut] (<https://orcid.org/0000-0003-0302-2312>), Brian Ripley [ctb], Bill Venables [ctb], Douglas M. Bates [ctb], Martin Maechler [ctb] (<https://orcid.org/0000-0002-8685-9910>)

Initial release