Date:         Mon, 21 Jan 2008 21:29:18 -0800
Reply-To:     John Amora <bayesian2001@yahoo.com>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         John Amora <bayesian2001@yahoo.com>
Subject:      Re: Excluded variables from regression
Comments: To: "James C. Whanger" <james.whanger@gmail.com>
In-Reply-To:  <6974301d0801211934kebdf138xbc097027db0fbb93@mail.gmail.com>
Content-Type: text/plain; charset=iso-8859-1

If ENTER method is used; that is, if all the
predictors variables (X's) are forced to ENTER in the
regression model, exclusion will possibly occur
especially if some of the X's are highly correlated
(multicollineary problem). Basically, if a set of
predictor variables are highly correlated only one is
included in the regression model and the rest are
excluded.  Why not use SEM, instead of regression?

Johnny


--- "James C. Whanger" <james.whanger@gmail.com>
wrote:

> Another possibility is that you have inadvertantly
> chosen the "stepwise"
> method of variable selection.
>
>
>
> On Jan 18, 2008 4:45 PM, Justin Meyer
> <justin.meyer@rowlandreading.org>
> wrote:
>
> > One reason SPSS will exclude variables from a
> regression is if they are
> > not numeric. For example, a gender variable that
> uses M and F to
> > represent male and female would have to be recoded
> as 0 and 1 to be used
> > in a regression.
> >
> > ____________________________________
> >
> > Justin Meyer
> >
> > Rowland Reading Foundation
> >
> > phone: 866-370-7323  fax: 608-204-3846
> >
> > ____________________________________
> >
> >
> > -----Original Message-----
> > From: SPSSX(r) Discussion
> [mailto:SPSSX-L@LISTSERV.UGA.EDU] On Behalf Of
> > mmarkus
> > Sent: Friday, January 18, 2008 2:40 PM
> > To: SPSSX-L@LISTSERV.UGA.EDU
> > Subject: Excluded variables from regression
> >
> > Does anyone know why SPSS excludes certain
> variables from a regression?
> > Also,
> > does anyone know how to prevent this from
> happening?
> >
> > Thanks,
> >
> > Miljan
> > --
> > View this message in context:
> >
>
http://www.nabble.com/Excluded-variables-from-regression-tp14957806p1495
> > 7806.html
> > Sent from the SPSSX Discussion mailing list
> archive at Nabble.com<http://nabble.com/>
> > .
> >
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