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st: multiple imputation + transformation of parameters


From   Marcello Pagano <pagano@hsph.harvard.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: multiple imputation + transformation of parameters
Date   Thu, 13 May 2004 05:55:05 -0400

Michael is having problems posting this:

m.p.

-------- Original Message --------

Hi,
  I want to report confidence intervals for odds ratios.  It's clear
that -MIFIT- is working with the underlying betas even when one uses the
logistic command.  What STATA reports as the MI estimate for the odds
ratio is the exponentiated value of the betas averaged across the
imputations.

   It makes more sense to me to transform the betas before the
averaging.  My sense is that one should do all steps in the analyses
before implementing Rubin's rules.

   Does this sound right?  Can anyone make a counter-argument?

thanks
Michael

________________________________________________
E. Michael Foster
Professor of Health Policy and Administration and of Demography
(W) 814-865-1923
(Fax) 866-369-6737

Associate Editor, /Developmental Psychology



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