N.Steggles
> Thanks for the suggestion, however, replacing the 4df quintiles
> version of the variable by a 1df linear version results in
> a different
> model. What I want to do is replace it by a set of polynomial
> orthogonal dummy variables totalling 4df as can be done in SPSS.
> Can you tell me how to do this in STATA?
That wasn't clear to me.
I think John Hendrickx's -desmat- may be what you need.
Nick
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