st: Re: subject-specific imputation with ICE

["Sarah A. Mustillo" <smustillo@psych.duhs.duke.edu>]

Hi - I was waiting for someone else to reply, but haven't seen any cross 
the list.  When I use ICE, I impute within each subject.  I have no 
citations on this or anything to support that approach, it just 
intuitively seemed to me that it could be problematic to impute across 
the entire dataset when the obs are correlated.  So, I reshape the data 
to wide and impute as one observation per person.  Whether this actually 
makes a difference is probably questionable.  At some point I'll try it 
both ways and compare...

Good luck!

Sarah

Dan MacNulty wrote:

> I have two questions with respect to imputation and the program ICE. In 
> situations where data are subject-specific, e.g. clustered within 
> patient_ID, is it recommended that one impute within each subject or is 
> it sufficient to impute across the entire dataset? If the former, can 
> ICE be implemented to impute missing values within each subject, and if 
> so, how?
>
> thanks,
> Dan MacNulty
> University of Minnesota
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Sarah A. Mustillo, Ph.D
Department of Psychiatry and Behavioral Sciences
Duke University School of Medicine
Box 3454
Durham NC 27710

919 687-4686 x231
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