[R] Log-likelihood calculation in lme

PIERRE-JOSEPH tessa tessap_j at yahoo.fr
Thu May 19 15:54:55 CEST 2005

On a real data set, running the lme function, I get
parameters estimation and a log-likelihood value.
Nevertheless, the variance-covariance matrix in this
case had a determinant close to zero. So, I could not
calculate the log-likelihood myself with the classical
What is the calculus made in lme?
Thanks for all suggestions.

Tessa P-J

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