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Date:         Wed, 28 Sep 2005 10:36:26 -0300
Reply-To:     Hector Maletta <hmaletta@fibertel.com.ar>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Hector Maletta <hmaletta@fibertel.com.ar>
Subject:      Re: Interpretation of logistic regression ' results
Comments: To: kende jan <kendejan@yahoo.fr>
In-Reply-To:  <20050928132523.62270.qmail@web25410.mail.ukl.yahoo.com>
Content-Type: text/plain; charset="iso-8859-1"

The coefficients of dummies measure the significance of the difference between one category and the reference category. In your case, the reference category seems to be "in the middle", since two of the other categories have a negative coefficient and one category (represented by the DIAG(3) dummy) has a positive coefficient. I suspect that if you use the category represented by DIAG(3) as your reference category, the other two shown in the table would show a more significant (i.e. lower) probability, because they have a larger difference with that category than they have with your current reference category. However, I think what is more important is the coefficients of the categories, and not so much the overall effect of the categorical variable as such. If DIAG alludes to diagnostic, I suppose it is more important what the diagnostic is (i.e. which category), than the fact that some diagnostic existed.

Hector

> -----Original Message----- > From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU] > On Behalf Of kende jan > Sent: Wednesday, September 28, 2005 10:25 AM > To: SPSSX-L@LISTSERV.UGA.EDU > Subject: Interpretation of logistic regression ' results > > Dear all, > > In the multiple logistic regression, I have a categorical > variable (DIAG) with 4 levels, the coefficient on DIAG > variable is significant but the coefficients of the 3 > indicator variables are not significant. > > What can I say about the effect of this variable? > I cannot make any comparison between levels of this variable. > > Thank you for your help > Jan > > > > Variable B S.E. Wald df Sig > > > > DIAG 9.8081 3 .0203 > > DIAG(1) -2.1623 1.4277 2.2939 1 .1299 > > DIAG(2) -1.6487 1.0733 2.3596 1 .1245 > > DIAG(3) 1.4109 .9693 2.1185 1 .1455 > > > > > > > --------------------------------- > Appel audio GRATUIT partout dans le monde avec le nouveau > Yahoo! Messenger Téléchargez le ici ! > > __________ Información de NOD32 1.1235 (20050928) __________ > > Este mensaje ha sido analizado con NOD32 Antivirus System > http://www.nod32.com > >


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