st: code for Heckman selection with panel data

[Lindy Helfman <ljolsson@u.washington.edu>]

Hello Statalisters,

I'm looking for code to estimate a Heckman selection model for panel 
data (and fixed effects) as in:

J.M. Wooldridge (1995), “Selection Corrections for Panel Data Models 
Under Conditional Mean Independence Assumptions,” Journal of 
Econometrics 68, 115-132.

I've seen previous postings to this list (a few years back) that others 
have asked this question and been referred to www.gllamm.org, but my 
impression is that this would not work for fixed effects models.

Any advice or suggestions in procuring this code would greatly appreciated.

Thanks,
Lindy
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