On April 24, 2009 Dan Waldo wrote:
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.)
--------------------------
Dan-
I ran the following -glm- model with f, m, and s having two level and
p having 3 levels on a windows machine running Stata/SE 10.1.
. xi3: glm y i.f*i.m*i.s i.m*i.s*i.p [pw=w], f(gamma}
The model ran with no errors although with my data the results made no
sense. So, I'm not sure what's different about your
situation that is causing the problem.
--
Phil Ender
Statistical Consulting Group
UCLA Academic Technology Services
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