Re: st: Multiple imputation showing missing values during imputation

["Michael I. Lichter" <mlichter@buffalo.edu>]

Nailing,

I suspect that you haven't gotten any responses because your question is 
(or appears to be) very specific to your data, but you don't say much 
about the specifics of your data. It might be helpful to describe the 
variables involved and the constraints you are putting on the imputed 
data using the -interval- option to -ice-.

Here's a stab in the dark, though. Is it possible that one or more of 
your interval variables are missing for two cases in which your variable 
redlun5 is missing as well? If not, can you at least identify the two 
cases for which -ice- is failing to make an imputation and see if there 
is anything unusual about those cases' values on the other variables in 
the imputation?

-ml

Nailing Xia wrote:
> Hi,
>
> I am using -ice- for multiple imputation, and during the imputation
> process, Stata shows that values for several imputed variables that
> should have been imputed in previous cycle are actually missing. The
> actual error message reads as: "I found that 2 missing value(s) of
> redlun5 that should have been
> imputed were missing at cycle 2. Replacing value(s) with mean, dumping
> current data to file _ice_dump.dta and continuing."
>
> Anyone knows what seems to cause this problem? By the way, this
> problem did not exist when I imputed without using the -interval-
> option. But I checked my code for -interval- option, and it seems
> fine.
>
> Many thanks!
> Nailing Xia
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--
Michael I. Lichter, Ph.D.
Research Assistant Professor & NRSA Fellow
UB Department of Family Medicine / Primary Care Research Institute
UB Clinical Center, 462 Grider Street, Buffalo, NY 14215
Office: CC 125 / Phone: 716-898-4751 / E-Mail: mlichter@buffalo.edu

*
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