RE: BOV
From: "Kowalski, Ken" Ken.Kowalski@pfizer.com
Subject: RE: [NMusers] BOV
Date: Tue, September 21, 2004 2:24 pm
Pravin,
If every occasion has a different BOV then you will have an
over-parameterized model because by definition you don't have replication of
the same occasion and hence cannot estimate a different BOV for each
occasion (you need replication in order to estimate a variance). It is
necessary to assume that the BOV is the same across occasions so that you
can pool across occasions to estimate the BOV (this is the reason for the
$OMEGA BLOCK SAME option for the occasion-specific ETAs).
Ken