[R] lme problem ?

[Troels Ring]

Dear friends. I tried the session below with 10 MB in both vsize and nsize but didn't get the
example work. Is this a problem in LME or in me or both or somewhere else or undefined ?

R : Copyright 1999, The R Development Core Team
Version 0.64.0 Patched (May 3, 1999)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type    "?license" or "?licence" for distribution details.

R is a collaborative project with many contributors.
Type    "?contributors" for a list.

Type    "demo()" for some demos, "help()" for on-line help, or
        "help.start()" for a HTML browser interface to help.
Type    "q()" to quit R.

> library(lme)
> data(Orthodont)
> fm1 <- lme(distance ~ age, data = Orthodont) # random is ~ age
Error: Singularity in backsolve at level 2, block 1> 
> fm2 <- lme(distance ~ age + Sex, data = Orthodont, random = ~ 1)
Error: singular matrix in chol
> 
Troels Ring, MD
Department of Nephrology
Aalborg Hospital
Aalborg Denmark


-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._