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Date:         Wed, 17 Sep 2003 10:33:04 +0100
Reply-To:     jmcconnell@sigdiff.com
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         John McConnell <jmcconnell@sigdiff.com>
Subject:      Re: SPSS chokes, SAS computes principal components
Comments: To: paulandpen@optusnet.com.au
In-Reply-To:  <200309170110.h8H1At504954@mail015.syd.optusnet.com.au>
Content-Type: text/plain; charset="us-ascii"

Hi Sally,

I think Paul is probably spot on w.r.t. missing values.

SPSS Answernet reiterates and adds further references...

http://support.spss.com/answernet/details.asp?ID=24433

John

Significant Difference Building 3 Chiswick Park 566 Chiswick High Road London, W4 5YA

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> -----Original Message----- > From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU] On Behalf Of > Paul Dickson > Sent: 17 September 2003 02:11 > To: SPSSX-L@LISTSERV.UGA.EDU > Subject: Re: SPSS chokes, SAS computes principal components > > Hi Sally, > > On further thought, it is possible that this is occurring purely because > you are > using pairwise deletion in SPSS. The matrices in this case are being > computed > from a different set of cases each time. Try listwise deletion to start > with, though I > would never use this in my analyses and see if that makes any difference. > > By trying a different method of handling missing data you should see > whether > your choice of treatment of missing data is the cause > > Cheers again Paul > > > > Sally Zitzer <sallyz@u.washington.edu> wrote: > > > > I have a client who is trying to run factor analysis (principal > > components) in SPSS using pairwise deletion but gets the message > > "nonpositive definite matrix". When the same data is run in SAS > > proc princomp SAS proceeds to do the analysis with no problem. > > I just wondered if anyone on the list knows why SPSS comes to a > > complete halt? (my client is unhappy because she has only SPSS > > and can't get SAS, she is in a university in Turkey). > > > > Thanks, > > > > Sally in Seattle > > > > Sally Zitzer, C&C, Senior Computing Specialist, Statistical Software > > sallyz@cac.washington.edu or sallyz@u.washington.edu (206)-543-8515


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