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st: varlist not allowed in xi3

From   Dan Waldo <>
Subject   st: varlist not allowed in xi3
Date   Fri, 24 Apr 2009 06:19:00 -0700 (PDT)

Dear list members,

I am trying to test the nested interactions of 4 variables (n, a, g, and s) on the depvar drg_wgt using xi3 and glm.

Stata tells me the following:

. xi3: glm drg_wgt i.n*i.a*i.g i.a*i.g*i.s [pweight=weight] , f(gamma)
i.n               _In_0-2             (naturally coded; _In_0 omitted)
i.a               _Ia_0-65            (naturally coded; _Ia_45 omitted)
i.g               _Ig_1-2             (naturally coded; _Ig_1 omitted)
i.s               _Is_1-7             (naturally coded; _Is_4 omitted)
varlist not allowed

The code works with a 3-way term and a 2-way term, but not with 2 3-way terms. Stata should be disregarding the duplicate 2-way interactions; all 4 explanatory variables are numeric (byte); and the drg_wgt is a floating-point number. What am I missing? (What worries me is that I thought this same code had run back in January, and this now casts doubt on my memory of other events in that month.)

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