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Re: st: Re: SW logisitc


From   "Shi Huang" <shuangenshi@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: SW logisitc
Date   Tue, 12 Sep 2006 13:28:57 -0400

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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