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st: MI questions


From   "Christopher Parker" <parker@berkeley.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: MI questions
Date   Tue, 13 Feb 2007 16:16:39 -0800 (PST)

Dear Group:

I need some advice. I'm attempting the following:

x1-x3 are not observed in dataset1, but I need them for theoretical
purposes. Therefore, I treat them as missing data in dataset1 and impute
them from dataset2 using demographic information common to both datasets.

My sequence of events is as follows:

1) append dataset1 to dataset2; in dataset2 I have demographics & x1-x3;
in dataset1 there's only demographics.

2) I then run Amelia II to fill in the missing values of dataset1 from
dataset2.

3) I then merge the imputed data with data in dataset1

Here's the problem: x1-x3, the imputed data, have negative values after
merging with dataset1. There shouldn't be negative values. These are
dichotomous 0-1 values when observed in dataset2. Needless to say, this
causes problems with estimation.

Can you please advise?
Thanks



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