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Re: st: mi impute: ologit, mlogit, logit in one equation?
From
daniel klein <[email protected]>
To
[email protected]
Subject
Re: st: mi impute: ologit, mlogit, logit in one equation?
Date
Tue, 17 May 2011 17:34:58 +0200
Hi Maria,
as the -mi impute- help file suggests, the only way to impute multiple
variables, if the pattern is not monotone, is to use multivariate
normal regression (or joint modeling). It is therefore not possible to
specify different models for different variables with -mi impute-.
That is because unklike -ice-, -mi impute- does not use chained
equations (or fully conditional specification).
As far as I know, fully conditional specification (FCS) performs well
in simulation studies, yet "[t]here appears to be [...] no really
satisfactory theory" (van Buuren et. al 2006) behind it, which migth
be the reason it is not implemented in offical Stata.
On the other hand -ice- works pretty well and may easily be combined
with offical -mi- (e.g. -mi ice-, -mi import-) so there may be little
need to impement an offical Stata command.
Would be nice to read some more sophisticated answers/explanations form others.
Best
Daniel
Van Buuren, S., Brand, J.P.L., Groothuis-Oudshoorn, C.G.M., Rubin, D.
B. 2006. Fully Conditional Specification in Multivariate Imputation.
Journal of Statistical Computation and Simulation, 76(12): 1049–1064
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