Become insignificant after MI

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Posts: 26
Joined: Tue Aug 21, 2012 1:56 am

Become insignificant after MI

Post by hdilk0507 »

When I imputed missing values for an ordinal categorical variable (using REALCOM-impute) and then fitted the MOI to imputed data sets & combined results using Rubin's rule, all the categories (dummy variables) of that variable became insignificant. But in complete case analysis one category was significant. I need to know,

1. Does this indicate my imputations are wrong?
2. Should I fit another MOI that does not include that variable to my data set?
Harvey Goldstein
Posts: 49
Joined: Sun Sep 06, 2009 5:30 pm

Re: Become insignificant after MI

Post by Harvey Goldstein »

This is often what you might get when you do imputations - suggests that the complete cases analysis produced biased results.
Harvey Goldstein
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