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st: micombine


From   Elisabetta Petracci <elisabetta.petracci@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: micombine
Date   Tue, 11 Jan 2011 11:11:39 -0500

Dear all,

*I am using Stata 11 and referring to the paper published on Stata
Journal "Multiple imputation of missing values" by Royston (2004).
*Following the logic of the reported example, I need to impute missing
values for dichothomous varaibles and then to run  a quantile
*regression on the complete datasets, considering m=5 copies of the
dataset.

*These are my 8 varaibles with missing values.

mvis cometivedi1_new cometivedi2_new cometivedi3_new cometivedi4_new
cometivedi5_new cometivedi6_new cometivedi7_new cometivedi8_new using
trial, m(5) genmiss(m_) seed(1981)

use trial,clear

micombine qreg quantobuonasalute cometivedi1_new, quantile(.5)

*"micombine" should work with command "qreg" but I get the following
error message: "imputation identifier _mj not found"

*Why does this happen? Any suggestion to impute missing values using a
Multiple Imputation technique able to run a quantile *regression
afterward?

Thank you very much,

Elisabetta
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