In response to Manuela De Allegri's post about testing for trend after
logistic regression, I mentioned -desmat- from John Hendrickx. Yesterday, I
chance re-encountered another user-written command for coding
contrasts: -xi3- from Michael Mitchell & Phil Ender. -xi3-'s help file
reminded me that it, too, can conveniently set up orthogonal-polynomial and
Helmert contrasts, among others--not only three-way interactions. Apologies
for the oversight in my original post.
Joseph Coveney
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