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st: Heckman model with gllamm and ordinal/multinomial response
From
"Silcocks, Paul" <[email protected]>
To
"'[email protected]'" <[email protected]>
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: [email protected]
tel: 0151 7948802
mob: 0794 983 2775
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