I have done something similar, and it required quite a bit of work: The way I have done this is to:
1) create separate dataset for each survey,
2) run -ice- on each dataset,
3) append the resulting datasets into one new dataset,
4) use the appropriate formulas (http://www.stat.psu.edu/~jls/mifaq.html) to get parameter estimates and standard errors.
There are tools available to make step 4 easier (see: -findit mifit-) but in my case the dataset got too big too use them.
Hope this helps,
Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of Stijn Ruiter
Sent: dinsdag 23 januari 2007 11:41
To: [email protected]
Subject: st: ICE with if statement
Hi all,
I am trying to multiply impute data per survey using ICE. However, I do
not understand how the IF statement should be used to do this. When I
use the following command, test1.dta still contains all surveys:
ice x1 x2 x3 using "G:\test1.dta" if survey==1, m(5)
Subsequently, I run:
ice x1 x2 x3 using "G:\test2.dta" if survey==2, m(5)
which results in test2.dta containing all surveys too.
As I understand it, there is no BY statement as in SAS PROC MI.
Can anyone tell me how to run imputations per survey?
Thanks in advance,
Stijn
--
Stijn Ruiter
Department of Sociology / ICS
Radboud University Nijmegen
P.O. Box 9104
6500 HE Nijmegen
Netherlands
Phone: + 31 24 361 2272
Fax: + 31 24 361 2399
Visiting address:
Thomas van Aquinostraat 4.01.74
Nijmegen
website: http://oase.uci.ru.nl/~sruiter
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