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

 From fjgallo@mac.com To statalist@hsphsun2.harvard.edu Subject Re: st: Re: Calculate beta values for mim results Date Sat, 02 May 2009 10:04:59 -0400

```Hi Maarten,

```
I have concluded that it is my copying and pasting mechanism (paste and match style does not work) that I am having difficulties with when I try to reply. So I will need to retype what I did with your below response. First, I opened the data file in which I saved the stacked imputed data sets: m(5), each set n = 3,300. Next, I ran the below syntax (for my below example, I only included a few predictor variables and the criterion variable pforce). I obtained coefficients for the run. Did I do this correctly? Please remember that I am a Stata beginner. Thank you.
```
Best Frank

----------------------------------------------------------
mim, storebv: regress pforce assign time day

foreach var of varlist pforce assign time day {
gen double z`var' =.
}

forvalues i = 1/5 {
foreach var of varlist pforce assign time day {
sum `var' if _mj ==`i'
replace z `var' = (`var' - r(mean)) / r(sd) if _mj == `i'
}
}

mim: regress zpforce zassign ztime zday

-------------------------------------------------------------

On May 1, 2009, at 12:04 PM, Maarten buis wrote:

```
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
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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```
```

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```