I wrote:
Second is to use -xi3- or -desmat- to create effect-coding or deviation
indicator variables . . .
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I had intended to mention that both of these are user-written
ommands: -xi3- by Michael Mitchell and Phil Ender, and -desmat- by John
Hendrickx. I believe that both commands are available on SSC, but if not,
then use -findit- to locate where you can install them from.
Joseph Coveney
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