| 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(...)
... |
one or more factors. |
A factor whose levels index the symmetric interaction of all factors supplied as input.
Symm relies on the gtools package from CRAN
David Firth
if (require(gtools)) {
row <- gl(4, 4, 16)
col <- gl(4, 1, 16)
symm4by4 <- Symm(row, col)
matrix(symm4by4, 4, 4)
} else cat("Symm requires the gtools package to be installed\n")