Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: prediction of model using svy-commands


From   Rune Nielsen <nielsenrune@me.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: prediction of model using svy-commands
Date   Thu, 08 Oct 2009 09:54:34 +0200

Hi, 
I'm using stata 11.0 on a Mac with os 10.6. I'm using spost 9. After setting the survey parameters I try running this regression: 

svyset [pweight=vekt_alle], strata(kilde)
svy: regress log_kost i.GOLDogrestr i.kjonn_omv i.smoke_bin alder2006 i.utdannelse_omv if har364dg==1 & n474==100

when I try using prvalue:
prvalue, x(_IGOLDogres_2=0 _IGOLDogres_3=0 _IGOLDogres_4=0 _Ikjonn_omv_1=0.415 _Ismoke_bin_1=0.559 _Iutdannels_1=0.479 _Iutdannels_2=0.3047 alder2006=61.868) 

I get this error:

factor variables and time-series operators not allowed

However, if I try doing this without the svy-prefix, spost manages to predict nicely. I'm not that skilled, so perhaps there is some kind of obvious error in my commands?

Best wishes,

Rune 



 
Den 8. okt. 2009 kl. 09.42 skrev Michael I. Lichter:

What version of Stata are you using, what version of spost, what command line are you using, and what do you mean by "not possible"? In Stata 10.1, using spost9, I just ran -svy: reg depvar age gender- followed by -prvalue, x(age=50)- and got a sensible answer from -prvalue- (I did not, however, verify that the answer was correct).

Michael

Rune Nielsen wrote:
Dear statalist-members,
I'm running a model (multiple linear regression) using the /svy/-prefix to adjust for a stratified sample. The outcome is log-transformed due to large left-skewing.
I would like to do some predictions using prvalue from the spost-package. However, this is not possible when I've used the survey-version of/ regress/. Does anybody know a simple solution to this? I've already tried running the model without svy, but specifying pweight and vce(cluster clustervar), but then I don't get reliable confidence intervals.
Grateful for any answers (in simple language for a non-statician)

Best wishes,

Rune Nielsen

---
Rune Nielsen, MD, research fellow
Institute of Medicine, Bergen, Norway

--
Michael I. Lichter, Ph.D. <mlichter@buffalo.edu>
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 126 / Phone: 716-898-4751 / FAX: 716-898-3536

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/




© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index