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Re: st: Re: standardized coefficient in survey weighted regression using spost9


From   Steven Samuels <sjhsamuels@earthlink.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: standardized coefficient in survey weighted regression using spost9
Date   Sat, 22 Nov 2008 17:58:28 -0500

--


In Stata's survey programs, estimates of regression coefficients and of population SD's depend only on the survey weights, not on other aspects of the design. Therefore, contrary to Michael's point 2, Sandi can use -reg- with -pweights- and the -beta- option to get standardized betas for any complex survey.

-Steve


On Nov 20, 2008, at 6:57 PM, Michael I. Lichter wrote:

1. Sandi implied that she was using the survey commands (by mentioning svyset). They do not support the beta option.

2. However, if Sandi only has pweights and not a complex design (with clustering or stratification), she can use "regular" - regress- with a pweight and specify the beta option as Martin suggested.

3. I assume there is a reason having to do with the survey method of variance estimation that explains why the svy commands do not produce betas and why programs like listcoef and betacoef don't work with them, but I don't know what it is.

-ml

Martin Weiss wrote:
BTW, why not use the -beta- option to -regress- which does allow sampling weights?

*************
sysuse auto, clear
g r=5*runiform()
regress length price mpg rep78 [pweight = r], beta
*************

HTH
Martin
_______________________
----- Original Message ----- From: "Pruitt, Sandi" <SPRUITT@DOM.wustl.edu>
To: <statalist@hsphsun2.harvard.edu>
Sent: Friday, November 21, 2008 12:27 AM
Subject: st: standardized coefficient in survey weighted regression using spost9


I am running a weighted linear regression (using a sampling weight or "pweight") using svyset commands. Following a previous listserv discussion, I downloaded spost 9 and used the command listcoef so I could obtain standardized betas for this regression. (I have a reviewer specifically asking for this.) However while it works, I get the following warning:

"pweights not compatible with summarize; weights will be treated as aweights"

Can someone tell me how this might be affecting the standardized beta that I want to report?

Thanks.

________________________________________
Sandi L. Pruitt
Postdoctoral Research Associate
Washington University School of Medicine
Division of Health Behavior Research
Campus Box 8504
4444 Forest Park Avenue, Suite 6700
St. Louis, MO 63108
Phone: 314-286-1921
Fax: 314-286-1919
spruitt@dom.wustl.edu


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--
Michael I. Lichter, Ph.D.
Research Assistant Professor & NRSA Fellow
UB Department of Family Medicine / Primary Care Research Institute
UB Clinical Center, 462 Grider Street, Buffalo, NY 14215
Office: CC 125 / Phone: 716-898-4751 / E-Mail: mlichter@buffalo.edu

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