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st: Imputation with excess zeros [Was: Converting a continuous var into...]


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: Imputation with excess zeros [Was: Converting a continuous var into...]
Date   Tue, 7 Jul 2009 18:25:18 +0000 (GMT)

--- On Tue, 7/7/09, Lachenbruch, Peter wrote:
> I am particularly interested in this since I'm looking at
> some data for a multiple imputation in which we would
> like the continuous variables to be approximately normally
> distributed.  Many are not.  In looking for transformations
> to normality (boxcox), nothing seems to work.  So my
> solution has been to group them into 5 or 6 categories and
> use ologit for  imputation.  The problem has been a huge
> excess of zeros.
 
Are these excess zeros a characteristic of the original data 
or the result of the imputation?

-- Maarten

-----------------------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


      

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