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st: Streg (gamma): discontinuous region encountered


From   Jana von Stein <janavs@umich.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Streg (gamma): discontinuous region encountered
Date   Thu, 17 Nov 2011 16:51:19 -0500

Hi --

I am trying to fit a Gamma model to determine which distribution to use in streg. The following happens:

Fitting full model:

Iteration 0:   log pseudolikelihood = -139.27247
Iteration 1:   log pseudolikelihood = -133.40312  (not concave)
Iteration 2:   log pseudolikelihood = -130.07612  (not concave)
Iteration 3:   log pseudolikelihood = -129.51053  (not concave)
Iteration 4:   log pseudolikelihood = -129.43679  (not concave)
Iteration 5:   log pseudolikelihood = -129.37384
cannot compute an improvement -- discontinuous region encountered


Does anyone know what might be going on? Or if there is some other way to do this?

thanks,
Jana
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