Dear all,
I am using the nlme package and trying to modelate the variance-
covariance matrix of random effects.
However, I do not understand why do I get this error message:
> M4CompSym <- update(M4,random=A~pdCompSymm(~CED))
Error in pdMatrix.pdCompSymm(x) :
Cannot extract the matrix from an uninitialized pdMat object
Can anyone please help me?
How do I update one Model using one of the pre-defined matrixes?
Regards,
Sara Mouro
Sara Maltez Mouro
Centro de Ecologia Funcional
Departamento de Botânica
Universidade de Coimbra
[EMAIL PROTECTED]
www.uc.pt/ecology/saramaltezmouro
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