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Date:         Tue, 12 Aug 1997 11:26:18 -0400
Reply-To:     Staffan Lindberg <slind@MHK.KS.SE>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@UGA.CC.UGA.EDU>
From:         Staffan Lindberg <slind@MHK.KS.SE>
Subject:      Re: Ex post facto comparisons between x-tab of nominal variables
Comments: To: David Nichols <nichols@SPSS.COM>
In-Reply-To:  <5saq33$l6h@netsrv2.spss.com>
Content-Type: text/plain; charset="us-ascii"

Thank you David and Rich for your elucidating answers. Do you have any opinions on the question of ex post facto collapsing adjacent categories in order to attain significant chi-squares ?

best regards

/Staffan

At 21.24 1997-08-06 GMT, David Nichols wrote: >In article <5rsum4$sal@usenet.srv.cis.pitt.edu>, >Richard F Ulrich <wpilib+@pitt.edu> wrote: >>Staffan Lindberg (slind@MHK.KS.SE) wrote: >>: Could anyone help me with suggestions of an analysis method for the >>: following problem: >> >>: I have 4 groups (1,2,3,4 in the variable GROUP). I want to crosstabulate >>: this with a lot of other nominal variables (with number of values between 2 >>: to 5). For the crosstabulations with significant Chi-squares I want to >>: pinpoint the groups that contribute the most towards the difference. >> >> << snip, rest >> >> >>It sounds to me like you want to see what contribution each cell >>gives to the total chisquared, when you look at the total as the >>sum of Expected-Observed, squared, divided by Expected. >> >>SPSS does not show that, but it does have REsiduals and Expected, >>so you might compute your own. Or it has Standardized residuals, >>and Adjusted standardized residuals - for which they cite >>Haberman, 1978, Analysis of qualitative data. One of those might >>be proportionate to the X2-contribution, but I do not recall. >> >> >>Rich Ulrich, wpilib+@pitt.edu > >The standardized residuals are the square roots of the contributions >to the Pearson chi^2. The adjusted standardized are approximately >distributed as standard normals under the null hypothesis that the >data fit the independence model. > >-- >----------------------------------------------------------------------------- >David Nichols Senior Support Statistician SPSS, Inc. >Phone: (312) 329-3684 Internet: nichols@spss.com Fax: (312) 329-3668 >----------------------------------------------------------------------------- > >

===================================================== Staffan Lindberg Karolinska Hospital Magnus Huss clinic S-171 76 Stockholm SWEDEN ===================================================== Ph. at work Int+46 8 51772936 Ph. at home Int+46 8 6470383 Mobile ph. Int+46 8 070-5436925 Fax Int+46 8 326369 e-mail slind@mhk.ks.se =====================================================


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