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st: csipolate not csipolating


From   Michael Mulcahy <[email protected]>
To   "[email protected]" <[email protected]>
Subject   st: csipolate not csipolating
Date   Sun, 20 May 2012 06:30:27 -0700 (PDT)

Hi,
I'm trying to use csipolate to interpolate missing values for 1 year in a panel dataset of city-year observations. None of my cities have observations for 1997, they all have observations on the variable in question for 1992 thru 2002. I'm writing:

by id: csipolate dues year if year > 1991, gen(csipdues) 

The new variable, "ipdues", has missing values for 1997.

The cipolate command (with analogous syntax), on the other hand, works. I can just use the "cipdues", but I wanted to compare that to the csipolate result.


Am I not understanding some "no singleton values" issue here? 


Thanks for your consideration!
Mike


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