Date: Wed, 10 Nov 2010 12:25:15 -0500
Reply-To: Regina Rendas-Baum <rrbaum@QUALITYMETRIC.COM>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: Regina Rendas-Baum <rrbaum@QUALITYMETRIC.COM>
Subject: confidence intervals for V matrix in SAS proc mixed
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I would like to calculate the confidence intervals for the correlations in the V=ZGZ' + R matrix in proc mixed.
It seems SAS does not provide the elements of V, although I think this would be something that users would often want. I believe one way to achieve this would be to retrieve the elements of RCORR, GCORR and ASYCORR and apply the Delta Method or use bootstrapping.
I would be extremely appreciative if somebody could provide any information/guidance on this process or whether there are other ways of obtaining these confidence intervals that I may not be aware of.
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