Date:         Mon, 13 Jan 1997 18:09:55 GMT
Reply-To:     David Nichols <nichols@SPSS.COM>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@UGA.CC.UGA.EDU>
From:         David Nichols <nichols@SPSS.COM>
Organization: SPSS, Inc.
Subject:      Re: Correlations

In article <32DAD470.63C6@education.leeds.ac.uk>,
nick nelson <n.w.nelson@education.leeds.ac.uk> wrote:
>Nichols, David wrote:
>
>> 4) Tetrachoric correlations are special cases of polychoric
>> correlations. No
>> SPSS procedure directly calculates them, though PRELIS does (as a
>> special
>> case of polychoric correlations).
>
>I am also interested in computing tetrachoric correlations as a
>precursor
>to factor analysing the matrix to determine the dimensionality of test
>responses.
>
>Where can I find documentation for PRELIS? the help system will show
>me the syntax, but I feel I need more than that.
>
>Regards, Nick.
 
Check the SPSS LISREL 7 and PRELIS User's Guide and Reference.
 
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David Nichols             Senior Support Statistician              SPSS, Inc.
Phone: (312) 329-3684     Internet:  nichols@spss.com     Fax: (312) 329-3668
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