Message-ID: <434E6A3D.1050101@mrc-bsu.cam.ac.uk>
Date: 2005-10-13T14:07:57Z
From: Richard Nixon
Subject: nlme gls() error
Hello
I'm fitting a gls model with a variance-covariance structure and an
getting an error message I don't understand
I'm using gls() from the nlme library with the structure defined by
correlation = corSymm(form = ~1|Subject), weights = varIdent(form=~1|strata)
I get the error
Error in recalc.corSymm(object[[i]], conLin) :
NA/NaN/Inf in foreign function call (arg 1)
My dependent variable is highly positively skewed and has with many zero
value.
Any ideas as to the cause of the error? Could I play around with any of
the glsControl values to help out?
Thanks
Richard
--
Dr. Richard Nixon, MRC Biostatistics Unit, Cambridge, UK
http://www.mrc-bsu.cam.ac.uk/personal/richard