Re: st: does -margins- work after -menbreg- or -mepoisson- in Stata 13?

["Ariel Linden, DrPH" <ariel.linden@gmail.com>]

This won't make you feel any better, but I receive the same error when using
-meglm-

webuse pig
meglm weight i.week || id:
margins

default prediction is a function of possibly stochastic quantities other
than e(b)
r(498);


I spent an entire day trying to track down the post-estimation commands for
margins after meglm, to no avail. 

Substituting -mixed- for -meglm- works fine

webuse pig
mixed weight i.week || id:
margins
 
Ariel 

Date: Sun, 11 Aug 2013 19:28:39 -0500
From: Steve <drlead@prodigy.net.mx>
Subject: st: does -margins- work after -menbreg- or -mepoisson- in Stata 13?

I'm trying to use -margins- after -menbreg-.

No matter how I set up the -margins- command, I receive the following 
error message:

default prediction is a function of possibly stochastic quantities other 
than
e(b)
r(498);

Here's just one example of the syntax I've used:
      margins x1, at(x2=(-1(.1)3))
where
     x1 = dichotomous variable
and
     x2 =  continuous variable

Both variables are in the -menbreg- model.

I have the same problem after mepoisson.

I know that -margins- works after -mixed- in Stata 12.

Am I neglecting something or will -margins- not work after -menbreg- and 
- -mepoisson- in Stata 13?  Are there other new mixed commands in Stata 13 
after which -margins- will not work?

Steve Rothenberg
Instituto Nacional de Salud Pública
Cuernavaca, Morelos, México



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