Re: st: prediction of model using svy-commands

[Rune Nielsen <nielsenrune@me.com>]

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
>
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