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From | Scott Merryman <scott.merryman@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: AW: changes in -xi: xtmixed- command from Stata 10 to 11 |
Date | Thu, 22 Apr 2010 08:03:35 -0500 |
On Thu, Apr 22, 2010 at 7:38 AM, Martin Weiss <martin.weiss1@gmx.de> wrote: > > <> > > A similar thing happens when I run this example in Stata 10.1 MP: > > > ************* > webuse melanoma, clear > gen uv2 = uv^2 > xtmepoisson deaths uv uv2, exposure(expected) || nation: || region: > ************* > > versus this in Stata 11 MP: > > ************* > webuse melanoma, clear > xtmepoisson deaths uv c.uv#c.uv, exposure(expected) || nation:|| region: > ************* > > The Stata 11 incarnation constantly reports "flat or discontinuous region > encountered", while the 10.1 version converges after a couple of steps: That's odd - I get convergence with Stata 11 MP. . webuse melanoma, clear (Skin cancer (melanoma) data) . xtmepoisson deaths uv c.uv#c.uv, exposure(expected) || nation:|| region: Refining starting values: Iteration 0: log likelihood = -1169.4088 (not concave) Iteration 1: log likelihood = -1156.8957 (not concave) Iteration 2: log likelihood = -1101.9749 Performing gradient-based optimization: Iteration 0: log likelihood = -1101.9749 Iteration 1: log likelihood = -1097.2043 Iteration 2: log likelihood = -1089.5644 Iteration 3: log likelihood = -1089.4115 Iteration 4: log likelihood = -1089.411 Iteration 5: log likelihood = -1089.411 Scott * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/