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st: Replacing missing values


From   "joe J." <otharain@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Replacing missing values
Date   Thu, 22 Apr 2004 05:30:00 +0000

I have a panel (unbalanced) dataset of manufacturing plants for several years. Investment series is missing for a lot of plants. I tried the statacode -ipolate-, which uses linear interpolation and extrapolation procedures. But these have resulted in many negative values. Is there any way one could restrict -ipolate- from extrapolating negative values or are there superior methods to replace missing values?

Joe

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