| Symm {gnm} | R Documentation |
Symm codes the symmetric interaction of factors having
the same set of levels, for use in regression models of symmetry or
quasi-symmetry.
Symm(..., separator = ":")
... |
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. |
A factor whose levels index the symmetric interaction of all factors supplied as input.
David Firth and Heather Turner
rowfac <- gl(4, 4, 16) colfac <- gl(4, 1, 16) symm4by4 <- Symm(rowfac, colfac) matrix(symm4by4, 4, 4)