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st: Infinite iterations in shwinters

From   "Adam S. Hersh" <>
Subject   st: Infinite iterations in shwinters
Date   Thu, 05 Oct 2006 12:19:03 -0400

I am using "tssmooth shwinters" to forecast monthly payroll employment data.
When I specify the "additive" option, Stata cannot converge on optimal smoothing
parameters and simply iterates off to infinity. When this happens, the output
indicates "(backed up)" after each iteration.

Any ideas on what is happening?


Adam S. Hersh
Ph.D. Candidate, Department of Economics
and Research Asst, Political Economy Research Institute
University of Massachusetts, Amherst

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