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st: Heckman model with gllamm and ordinal/multinomial response


From   "Silcocks, Paul" <Paul.Silcocks@liverpool.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: Heckman model with gllamm and ordinal/multinomial response
Date   Thu, 10 Nov 2011 12:53:56 +0000

Hi - I'm trying to run a Heckman selection type of model where the response variable may be ordinal (or even multinomial, though I've not got that far yet).  As a test data set I've used the data set womenwk as in the example given by Sophia Rabe-Hesketh "Multilevel selection models using gllamm"  Stata User Group Meeting, Maastricht, May 2002 - but converting wage into 4 ordered categories.

The problem is that the syntax for the linear predictor in the example specifies "no constant" (as I understand it, this is because the intercepts are already specified by the command eq load: i1 i2.  However the ordinal logit model for the response (and I assume the multinomial one too)  will not permit a "no constant" option.

Any thoughts on how to tweak the linear predictor?

Many thanks


Paul Silcocks BM BCh, MSc , FRCPath, FFPH, CStat
Senior statistician,
Cancer Research UK Liverpool Cancer Trials Unit 
University of Liverpool
Block C Waterhouse Building
1-3 Brownlow Street
L69 3GL 

email:  paul.silcocks@liverpool.ac.uk
tel: 0151 7948802
mob: 0794 983 2775


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