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...mm(), corAR1()). Is there a way to use them similarly as in lme ? Is it implemented ? If somebody knows, please let me know. Thank you very much in advance, Stephan ----------------------------- Dr. Stephan Moratti (PhD) Dept. of Psychology University of Konstanz P.O Box D25 Phone: +40 (0)7531 882385 Fax: +49 (0)7531 884601 D-78457 Konstanz, Germany e-mail: Stephan.Moratti at uni-konstanz.de http://www.clinical-psychology.uni-konstanz.de/

...plot all subjects on one page. Further, this error did not occur using older version of R (1.8 or 1.7). Did somebody encounter similar problems ? Stephan Moratti -- Dipl. Psych. Stephan Moratti Dept. of Psychology University of Konstanz P.O. Box D25 D-78457 Konstanz, Germany Tel.: +49 (0) 7531 882385

Dear all, I have a performance problem in terms of computing time. I estimate mixed models on a fairly large number of subgroups (10000) using lme(.) within the by(.) function and it takes hours to do the calculation on a fast notebook under Windows. I suspect by(.) to be a poor implementation for doing individual analysis on subgroups. Is there an alternative and more efficient way for doing

...imilar values ? Does it fail to estimate a general variance structure ? Is there a better way than skipping row 15 ? Thanks for some suggestions, Stephan Moratti ----------------------------- Dipl. Psych. Stephan Moratti Dept. of Psychology University of Konstanz P.O Box D25 Phone: +40 (0)7531 882385 Fax: +49 (0)7531 884601 D-78457 Konstanz, Germany e-mail: Stephan.Moratti at uni-konstanz.de http://www.clinical-psychology.uni-konstanz.de/

...;(`*tmp*`, value = c(62.3428455941166, 62.3428517930051 : Coefficient matrix not invertible Does somebody know why it doesn't work ? Stephan Moratti ----------------------------- Dipl. Psych. Stephan Moratti Dept. of Psychology University of Konstanz P.O Box D25 Phone: +40 (0)7531 882385 Fax: +49 (0)7531 884601 D-78457 Konstanz, Germany e-mail: Stephan.Moratti at uni-konstanz.de http://www.clinical-psychology.uni-konstanz.de/