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st: Multiple imputation: negative imputed values.
From
Khoi Dinh To <[email protected]>
To
[email protected]
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: [email protected]
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