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From | Jen Zhen <jenzhen99@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | st: qreg does not converge |
Date | Tue, 16 Mar 2010 15:09:42 -0400 |
To add one thing to my previous question: We also have the problem that the estimates do not converge and we get no estimate at all, unless we cut the number of observations by 50%, which is a shame because it costs us statistical significance. Is there maybe something we can do to still have it converge even on the larger sample? Thanks, J On Tue, Mar 16, 2010 at 2:17 PM, Jen Zhen <jenzhen99@gmail.com> wrote: > Dear members of the Statalist, > > when running > - qreg finw ry5-ry13 d1995-d2003 d2005-d2007 , wlsiter(50) - > we get the note that "alternate solutions exist" in between iterations. > > In an earlier list post > (http://www.stata.com/statalist/archive/2008-10/msg00519.html), it was > suggested to check whether the different alternate solutions differ > significantly, but Stata by default seems to give us only one. Do you > know a way to view the others, or other approaches to tackle this > issue? > Another suggestion made in that thread was to perturb the data and see > which of the answers remains, but we're not sure how to exactly > implement this perturbation. Should we just take all variables > currently used in the regression, add to them some small random error, > and then rerun the regression with those new variables? How large or > small should the error sensibly be? > > Thanks, > J > * > * 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/ > * * 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/