Date:         Mon, 10 May 2004 19:48:44 -0400
Reply-To:     manon girard <mansof@VIDEOTRON.CA>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         manon girard <mansof@VIDEOTRON.CA>
Subject:      Comparing intraclass correlations
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Hi,

I want to compare intraclass correlations for a twin study. My measure is
the children's weight (in kg) for monozygotic twins (MZ) and for dyzygotic
twins (DZ). I want to test the difference between the 2 intraclass
correlations:

H0 :  ICC (MZ) = ICC (DZ)
HA:  not equal

Weights are measured independantly for twin no 1 and for twin no 2, among
the MZ and the DZ.

I did not find any formula to do it and no SAS program to do it. How can I
program this into SAS ?

Thanks.
Manon Girard