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st: sqreg and 2sls


From   "roy wada" <roywada@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: sqreg and 2sls
Date   Sun, 18 Mar 2007 19:13:01 -0700

Velma wants to know how to achieve convergence when using sqreg.

I am interested in performing sqreg on a huge data on house price transactions
and marketing duration. My problem is that the model does not seem to converge.
And I keep on getting the note "convergence not achieved" and then the results
are printed......Can someone please tell me how reliable are these results and what
can I do to overcome this problem.
-help qreg- says the option -wlsiter(#)- should improve convergence. [R] qreg should provide some backgroud on the logic behind combining quantile regression and 2sls.

A quick search of the archive shows that the convergence problem with sqreg has been previously reported without resolution. I would suggest Velma examine the iteration log (under the option -log-) before contacting the help desk at Stata Corp.

st: Quantile Regression Convergence not achieved
www.stata.com/statalist/archive/2005-09/msg00746.html

st: qreg: # of replications and covergence
www.stata.com/statalist/archive/2006-04/msg01081.html

Re: st: No convergance?
www.stata.com/statalist/archive/2005-12/msg00548.html

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