Dear allstaters,
to fit a mixed model Y=Xb+Zu+e in SAS I use the proc mixed procedure. The
G-Matrix is the covariance of the random effects Cov(u) and R-Matrix of the
error term Cov(e).
With the parms statement I can specify values of the covariance parameters.
Does that mean the specification of R? (or specification of Cov(Y)=ZGZ'+R???)
Thx for help.
Steffen
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Dipl.-Math. Steffen Witte
Universitaet Heidelberg, Abteilung Medizinische Biometrie
Im Neuenheimer Feld 305, D-69120 Heidelberg
T: +49-(0)6221-56-4371, F: +49-(0)6221-56-4195
http://www.biometrie.uni-heidelberg.de
mailto:[log in to unmask]
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