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st: Difference in correlation coefficients

From   "Banya, Winston" <>
To   "''" <>
Subject   st: Difference in correlation coefficients
Date   Wed, 17 Jul 2002 09:03:20 +0100

Dear All,

I  have used the pwcorr command to get correlation coefficients and I am
interested in finding the difference in the coefficients and the
significance of the difference.

For example if I have 3 variables y1 y2 and x2 and then I do

pwcorr y1 x2 to get r1 and  pwcorr y1/y2 x2 to get r2. If there is an
improvement in r as a result of using y1/y2 then how to account for the
improvement together with its significance.  Is there anyway way I can do so
using STATA?

Many thanks

Winston Banya
Care of The Elderly Section
Imperial College School of Medicine
Hammersmith Campus
Du Cane Road
London W12 0NN

Tel:  +44 (0)20 8383 4284
Fax: +44 (0)20 8743 0798

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