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Date:         Wed, 13 May 1998 13:01:37 -0400
Sender:       "SPSSX(r) Discussion" <SPSSX-L@UGA.CC.UGA.EDU>
From:         Stephen Baker <stephen.baker@UMMED.EDU>
Organization: Massachusetts Division of Medical Assistance
Subject:      Re: ROC curves for yes/no response
Comments: To: Jeff Mather <Jmather@HARTHOSP.ORG>
Content-Type: text/plain; charset=us-ascii

The ROC analysis is generally used to evaluate the inherent predictive value of an instrument for a dicotomous outcome. If the instrument is dichotomous the analysis becomes meaningless, the appropriate analysis is a sensitivity/specificity analysis, i.e # true positives/(true positives + false negatives) and # true negatives/(true negatives+false positives). Since your instrument I understand is this sort.

Jeff Mather wrote:

> This is a bit off the SPSS path, but can anyone tell me if there is any way > to use a nominal response to draw an ROC curve? I'd like to compare > ultra-brief (one question) instruments for a diagnosis of depression (yes > or no) with standard questionnaire that uses a cutoff on an interval scale. > > My assumption was that this could not be done with a y/n response; that > you need at least a three point ordinal scale (ie. always, sometimes, > never) to be able to draw the curve. > thanks

-- Stephen P. Baker, MScPH (617) 210-5695 Director, Research and Evaluation (617) 451-7105 fax Massachusetts Division of Medical Assistance 600 Washington Street Boston, Massachusetts 02111

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