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Re: st: Re: Calculate beta values for mim results


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: Calculate beta values for mim results
Date   Fri, 1 May 2009 16:04:18 +0000 (GMT)

This is one way of getting standardized coefficients after multiple imputation:

*------------------- begin example ----------------------------
sysuse auto, clear
ice rep78 price mpg, m(5) clear

foreach var of varlist rep78 price mpg {
	gen double z`var' = .
}

forvalues i = 1/5 {
	foreach var of varlist rep78 price mpg {
		sum `var' if _mj == `i'
		replace z`var' = (`var' - r(mean)) / r(sd) if _mj == `i'
	}
}

mim : reg zprice zrep78 zmpg
*--------------------- end example ---------------------------------

Hope this helps,
Maarten

-----------------------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


--- On Fri, 1/5/09, fjgallo@mac.com <fjgallo@mac.com> wrote:

> From: fjgallo@mac.com <fjgallo@mac.com>
> Subject: Re: st: Re: Calculate beta values for mim results
> To: statalist@hsphsun2.harvard.edu
> Date: Friday, 1 May, 2009, 4:16 PM
> Thank you. Your thoughts were helpful, and I also hope that
> an experienced person with the -mim- command might offer
> some insight.
> 
> Best,
> Frank
> 
> On May 1, 2009, at 11:01 AM, Martin Weiss wrote:
> 
> <>
> 
> You can find a general recipe for recovering the beta
> coefficients here:
> http://www.stata.com/statalist/archive/2009-03/msg00154.html
> 
> As I have never used -mim-,  I am highly reluctant to
> endorse any calculation in connection with it. AFAIK, P.
> Royston, its author, does not post to the list regularly, so
> he is unlikely to comment, either. But there are probably
> more experienced listers who can step in...
> 
> Note that my  -mata- code was way too complicated as you
> have now revealed that you are a beginner. Sorry about
> that...
> 
> HTH
> Martin
> _______________________
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