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st: RE: correlation in multiple imputation dataset


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   stata list <statalist@hsphsun2.harvard.edu>
Subject   st: RE: correlation in multiple imputation dataset
Date   Sun, 13 Jul 2008 12:41:15 +0100 (BST)

-- Ed Al-Hussainy wrote to me privately
> I hope you can help me with a small problem. I have a dataset
> constructed by multiple imputation and I'm using the -mim- module in
> Stata to conduct my regression analysis. however, I can't seem to
> figure out how to calculate a simple correlation matrix for my
> variables using -mim-.
>
> Is there come way to use mim: pwcorr X1 X2..?

First of all, regarding private request for help see point 5 in the
Statalist FAQ http://www.stata.com/support/statalist/faq

One thing you can do is use the fact that the regression coefficient in
a bivariate regression is the correlation if you standardize both the
dependent and independent variable. In the example below I used Ben
Jann's -center- command for the standardization, which you can download
it by typing -ssc install center-.

*--------------- begin example -------------------------
sysuse nlsw88, clear
tempfile imp
gen black = race == 2
ice wage union hours tenure ttl_exp black married never_married, ///
saving(`imp') m(5)
use `imp', clear
bys _mj: center wage hours, prefix(z) standardize
mim : reg zwage zhours
*----------------- end example --------------------------
(For more on how to use examples I sent to the Statalist, see
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )

-- 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/
-----------------------------------------


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