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Date:   Wed, 14 Apr 1999 12:06:11 -0400
Reply-To:   William Dudley <wdudley@SPH.EMORY.EDU>
Sender:   "SPSSX(r) Discussion" <SPSSX-L@UGA.CC.UGA.EDU>
From:   William Dudley <wdudley@SPH.EMORY.EDU>
Subject:   Re: Reliability analysis
Comments:   To: glaser@pacific-science.com
Content-Type:   text/plain; charset="us-ascii"

Thanks Dale,

I seem to remember some disucssion of this on the listserver as well. I cannot find high corrleations in the matrix (nothin above .6) however, I wonder if I use the variables as predictors of some Y and include colinearity analysis, the relationsip might show up.

Bill

At 08:48 AM 4/14/1999 -0700, Dale Glaser wrote: >Please someone correct me if mistaken, but if a determinant approaches zero >then matrix inversion becomes problematic; the classic example is the case >of singularity (variables that are virtual linear combinations of others); >however, I recall asking about this exact issue a couple of years ago, and >if memory serves me well Dave Nichols response was essentially "don't worry" >about this warning. However, you ask an interesting question: in the >context of factor analysis or other correlational methods, a determinant of >zero implies singularity, hence, variables approaching correlation of 0; is >this the same for reliability? Does a determinant approaching zero in >reliability analysis entail highly correlated variables? > >Thanks > >Dale Glaser, Ph.D. >Senior Scientist, Pacific Science & Engineering >San Diego, CA > >-----Original Message----- >From: SPSSX(r) Discussion [mailto:SPSSX-L@UGA.CC.UGA.EDU] On Behalf Of >William Dudley >Sent: Wednesday, April 14, 1999 6:22 AM >To: SPSSX-L@UGA.CC.UGA.EDU >Subject: Reliability analysis > >Whne running reliabilty analysis what does the warning * * * Determinant of >matrix is close to zero: >Indicate about the items making up a scale? > >Thanks >Bill > > >*************************************************** >* William N. Dudley, PhD * >* Behavioral Science and Health Education * >* Rollins School of Public Health * >* Emory University * >* Atlanta 30322 * >* Phone 404 727 2447 * >* FAX 404 727 1369 * >*************************************************** > > *************************************************** * William N. Dudley, PhD * * Behavioral Science and Health Education * * Rollins School of Public Health * * Emory University * * Atlanta 30322 * * Phone 404 727 2447 * * FAX 404 727 1369 * ***************************************************


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