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st: exponential smoothing


From   Schöler, Lisa <lschoeler@wiwi.uni-frankfurt.de>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: exponential smoothing
Date   Mon, 16 Aug 2010 14:00:55 +0000

Hi Statalist,

I want to do exponential smoothing for sales with Stata. I used the command

.tssmooth dexponential sales = ussalesdols000, forecast(1)

Sometimes I get negative out of sample forecasts which can't be true for sales. Is there a way to include a constraint so the out of sample forecasts will not get negative?

Best
Lisa

Lisa Schöler
Professur für BWL, insb. Electronic Commerce
Goethe-Universität Frankfurt
Grüneburgplatz 1 
60629 Frankfurt a.M.
 
Phone: ++49 69 798 34632
Fax:   ++49 69 798 35001
Email: lschoeler@wiwi.uni-frankfurt.de
URL:   www.ecommerce.wiwi.uni-frankfurt.de

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