Andrew Beckerman wrote:
Hi all - (this is posted to r-help and R-SIG-MAC)

OSX 10.3.7, R 2.0.1, lme4/Matrix/latticeExtra latest, fresh install of R. MASS loaded (or not).

I am getting an error message for the print() and summary() commands with all lme models I try and run in lme4 (GLMM's work fine). Using the example from the lme help, summary and print produce the following errors, despite the model being fit, as indicated by VarCorr() and examination of str(fm). Any ideas?

(I can't reproduce this on a windows95 install of 2.0.1, so I am guessing it may be a mac thing at the moment? This happens with the binary or the source installation of lme4.)

Cheers
andrew

 > data(bdf)
 > fm <- lme(langPOST ~ IQ.ver.cen + avg.IQ.ver.cen, data = bdf,
+           random = ~ IQ.ver.cen | schoolNR)
 > summary(fm)
Error in verbose || attr(x, "verbose") : invalid `y' type in `x || y'
 > fm
Linear mixed-effects model fit by   Data: NULL
  Log-likelihood: NULL
  Fixed: list()
NULL

Length  Class   Mode
     0   NULL   NULL
Number of Observations:
Number of Groups: Error in 1:dd$Q : NA/NaN argument
 > VarCorr(fm)
 Groups   Name        Variance Std.Dev. Corr
 schoolNR (Intercept)  8.07702 2.84201
          IQ.ver.cen   0.20806 0.45614  -0.642
 Residual             41.34942 6.43035

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Check what packages you have loaded. It looks as if you have loaded lme4 and nlme at the same time and you their methods will conflict.


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