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st: St: Chamberlain's PPA

From   <>
Subject   st: St: Chamberlain's PPA
Date   Thu, 06 Feb 2003 07:23:28 -0800


I have been asked to implement Chamberlain's Percent Positive Agreement (PPA) which is the number of occurrences for which both observors report a positive result out of the total number of observations for which at least one observor reports a positive result (see Szklo and Nieto 2000).
My questions to the list are:
1) Is there an existing Stata procedure to implement Chamberlain's PPA?

2) Do any list members have alternatives approaches to Chamberlain's PPA?
Thanks for you help.


Chris McIntyre, PhD
Center for Evidence Based Medicine
Department of Clinical Epidemiology and Biostatistics
McMaster University
Hamilton ON Canada
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