Hello,

I am trying to do some plotting to check random effect assumptions for a
model I fit using lme.

I want to use qqnorm and pairs (similarly to examples given in Pinheiro &
Bates p. 188), but it's not working.  Here's some relevant code and the
error message:

library(nlme)
data(Machines)
m1 <- lme(fixed=score~Machine,random=~1|Worker/Machine, data=Machines)
qqnorm(m1, ~ranef(.))

Error in rep(names(fData), rep(nr, nc)) : invalid 'times' argument
In addition: Warning message:
In data.frame(Worker = list("(Intercept)" = c(-7.51429457896346,  :
  row names were found from a short variable and have been discarded

I also tried changing the last line to qqnorm(m1, form=~ranef(.))

Any advice?

Thanks,
Pat Zimmerman

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