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Re: st: micombine


From   Kristen Budd <buddkm@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: micombine
Date   Tue, 11 Jan 2011 11:36:52 -0500

Elisabetta,

If you are using ICE, the _mj represents your imputed data sets (ex.
logit var1 var2 if _mj==1, logit var1 var2 if _mj==2, etc.).  Is "_mj"
listed in
your variable list in STATA?  If not, you may need to reimpute your
original data.  In the cases I have encountered, ICE/micombine will
still work with "non" micombine commands -- in this case you would get
a warning message in red that your command is not valid to use with
micombine.  Even with this error, STATA "pushes" the analysis through
-- warning the results may not be valid.

Because you are getting an "_mj not found" error that leads me to
believe something is wrong with the imputed data set.  Possibly check
your code and re-run ICE.

If the _mj is there, I'm afraid that's where my advice stops and
someone else will need to step in with additional advice.

Best,

Kristen


On Tue, Jan 11, 2011 at 11:11 AM, Elisabetta Petracci
<elisabetta.petracci@gmail.com> wrote:
>
> 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
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/



--
Kristen M. Budd, MS
Doctoral Candidate

Department of Sociology
Purdue University
Stone Hall, Office 349A
700 W. State Street
West Lafayette, IN 47907
E-mail: kbudd@purdue.edu

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


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