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st: _rmdcoll with glamm

From   alec minnema <>
To   <>
Subject   st: _rmdcoll with glamm
Date   Thu, 9 Jun 2011 08:54:15 +0000

Dear Stata Users,

Due to the incorrect subject title, here I post my question again. I want to run a large number of random effects panel poisson regressions but because the robust option is not allowed in xtpoisson I use gllamm.
However, because gllamm is unable to handle collinear variables I first use _rmdcoll to select the variables that are not collinear. Unfortunately, for a large number of the regressions stata still gives the following error:

factor variables and time-series operators not allowed

Does someone know what is going on?
To illustrate here is a part of the code:
_rmdcoll v7 Rebate v28 v31 v32 v33 v63 v64 Promotion
gllamm `r(varlist)', i(v1) family(poisson) link(log) iterate(25) robust

Many thanks in advance,

Alec Minnema
University of Groningen

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