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RE: st: RE: Imputed Missing Values with Uvis


From   Richard Williams <Richard.A.Williams.5@nd.edu>
To   statalist@hsphsun2.harvard.edu
Subject   RE: st: RE: Imputed Missing Values with Uvis
Date   Thu, 24 Feb 2005 20:00:13 -0500

At 11:36 PM 2/24/2005 +0000, Nick Cox wrote:
No doubt this is what is often
wanted. But the help for -uvis-
is explicit:

Note that uvis will not impute observations for which
a value of a variable in xvarlist is
missing. Only complete cases within xvarlist are used.
I still find that unclear and not what I would expect! I agree that it cannot and should not impute observations when one or more x's have missing values. But, it should not be imputing in the first place if y is not missing, it should just plug in the observed value of y. As it stands, the program can actually create more missing data than was there in the first place. I suspect this is an unintended design flaw; at least I cannot think of any reason why you would want it to behave this way.


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Richard Williams, Notre Dame Dept of Sociology
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