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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/> > > . > > > > ===================== > > To manage your subscription to SPSSX-L, send a > message to > > LISTSERV@LISTSERV.UGA.EDU (not to SPSSX-L), with > no body text except the > > command. To leave the list, send the command > > SIGNOFF SPSSX-L > > For a list of commands to manage subscriptions, > send the command > > INFO REFCARD > > > > ===================== > > To manage your subscription to SPSSX-L, send a > message to > > LISTSERV@LISTSERV.UGA.EDU (not to SPSSX-L), with > no body text except the > > command. To leave the list, send the command > > SIGNOFF SPSSX-L > > For a list of commands to manage subscriptions, > send the command > > INFO REFCARD > > > > ===================== > To manage your subscription to SPSSX-L, send a > message to > LISTSERV@LISTSERV.UGA.EDU (not to SPSSX-L), with no > body text except the > command. To leave the list, send the command > SIGNOFF SPSSX-L > For a list of commands to manage subscriptions, send > the command > INFO REFCARD >

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