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Re: st: _rmdcoll with glamm

From   Nick Cox <>
Subject   Re: st: _rmdcoll with glamm
Date   Thu, 9 Jun 2011 09:59:59 +0100

I don't think the code you show has anything to do with the error
message you got. So, I guess you are showing us the wrong part of the

-gllamm- as I understand it much pre-dates Stata 11 and does not
understand factor variables.


On Thu, Jun 9, 2011 at 9:54 AM, alec minnema <> wrote:
> 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
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