Re: st: Re: SW logisitc

["Shi Huang" <shuangenshi@gmail.com>]

Hi, Rodrigo,

Thank you so much for help. It works.

BTW, Do you know how to force some variables stay in the model when
running backward selection?

Thanks

On 9/12/06, Rodrigo A. Alfaro <ralfaro76@hotmail.com> wrote:
> Shi,
>
> It seems to me that you are using -svylogit-... right?? Check in the manual
> the formula related with the weight that you are using. I am guessing that
> the weights are independent of the number of variables. Therefore, you can
> run -sw logit- using weights. Example: (1) Suppose that you are
> using -svyset [pw=wt], then create a new variable that describe the weights
> (weight is a fair name), (2) Check that -svylogit y x1 x2- gives you the
> same as -logit y x1 x2 [pw=weight]-, (3) Run your model as -sw logit
> [pw=weight].
>
> I hope this helps
> Rodrigo.
>
>
>
>
>
>
> ----- Original Message -----
> From: "Shi Huang" <shuangenshi@gmail.com>
> To: <statalist@hsphsun2.harvard.edu>
> Sent: Tuesday, September 12, 2006 11:02 AM
> Subject: st: SW logisitc
>
>
> Hello,
>
> I am doing backward logistic regression with survey data.
> Unfortunately,  SW is not supported by svy. Which means I have to do
> this manually. According to
> http://www.stata.com/support/faqs/stat/lrtest.html, backward LR is not
> appropriate if I understand correctly.  So I have to use backward
> Wald. Anybody can help me how to get Wald test? Or any command to do
> this?
>
> Thanks so much,
>
> Shi
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