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Re: st: Multinomial selection, but Selmlog/Svyselmlog not feasible


From   Guido Heineck <guido.heineck@gmx.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Multinomial selection, but Selmlog/Svyselmlog not feasible
Date   Tue, 22 May 2007 07:37:14 +0200

Anders,

thank you for your answer. Apologies for not providing references of the
mentioned papers. Here they are:

* Bourguignon, F., Fournier, M., and M. Gurgand, 2007, Selection bias
corrections based on the multinomial logit model: Monte Carlo
Comparisons, Journal of Economic Surveys, 21(1), 174-205.

* Lee, L.F., 1983, Generalized econometric models with selectivity.
Econometrica, 51, 507–512.

Also, thank you for pointing me towards ssm. I only had a quick look at it yet, but it apparently does not handle 'mlogit' for the selection equation. Since one of the authors, Sophia Rabe-Hesketh, is also one of the 'gllamm'-authors, I suppose multinomial selection cannot be estimated by gllamm or why should they otherwise not include this option in their 'ssm'-package?

Any further ideas?

Guido

...

> A possible alternative is the "gllamm wrapper" ssm. See -findit ssm-
> and the associated article in Stata Journal.

> Anders Alexandersson
> andersalex@gmail.com


> Guido Heineck <guido.heineck@gmx.net> wrote:
> I want to examine the relationship between alcohol and wages. Taking
> into account that smoking and drinking are related I estimate separate
> models for smokers and nonsmokers.
>
> My question: Assuming that selection into employment and smoking are
> not random, how can I correct for selection bias? I first thought of
> using selmlog/svyselmlog by generating a multinomial selection var
> (empl. smoker; empl. nonsmoker, not empl. smoker; not empl.
> nonsmoker), but these progs require observed values in y for only one > of these categories/choices.
>
> Given that I observe wages for employees irrespective of smoking
> behavior I cannot employ selmlog/svyselmlog. I'm thus somewhat stuck
> since the authors of selmlog (Bourguignon et al.) show in their recent
> J. of Economic Surveys article that the widely used procedure proposed
> by Lee may not be appropriate.
>
> Any insights or ideas for alternatives?

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