An example of Richard answer (using version 8)
sysuse auto
sw logit foreign (price mpg) ( trunk weight length turn), pr(.2) lockterm1
sw logit foreign price mpg ( trunk weight length turn), pr(.2)
Rodrigo.
----- Original Message -----
From: "Richard Williams" <[email protected]>
To: <[email protected]>
Sent: Tuesday, September 12, 2006 2:46 PM
Subject: Re: st: Re: SW logisitc
At 12:28 PM 9/12/2006, Shi Huang wrote:
>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?
In Stata 9 with the sw prefix, the lockterm1 option specifies that
the first term be included in the model and not be subjected to the
selection criteria.
-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
FAX: (574)288-4373
HOME: (574)289-5227
EMAIL: [email protected]
WWW (personal): http://www.nd.edu/~rwilliam
WWW (department): http://www.nd.edu/~soc
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
