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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