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st: Multiple imputation: negative imputed values.


From   Khoi Dinh To <todinhkhoi@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Multiple imputation: negative imputed values.
Date   Thu, 30 Dec 2010 07:29:03 -0800 (PST)

I was working on a data set with a lot of missing data.  I tried using multiple imputation and the results looked better.  However, I have 2 concerns as follows:

1. A few original variables do not have negative values (for example, faculty salaries, the number of bachelor's degrees produced...).  However, after I did 5 imputations (5 iterations), I found out that there were negative imputed values in those variables, too.  Are those negative values acceptable (because the original data went through 5 iterations)?  If they are not, then is there any measure to correct them?  I am asking these questions because I think I will have to present the descriptives of the imputed data, and I want to make sure the negative imputed values are acceptable to the public.

2. After the imputation, I ran the command sureg (seemingly unrelated regression).  However, Stata did not report the adjusted R-squared or RMSE.  Is there any way to get these statistics from the output?

Thank you very much.

----------------------------------
Khoi Dinh To
E-mail: todinhkhoi@yahoo.com


      
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