[R] glmmPQL

[Liliana Forzani]

when I tried the example in glmmPQL I got an error

library(nlme)
   summary(glmmPQL(y ~ trt + I(week > 2), random = ~ 1 | ID,
                      family = binomial, data = bacteria))

iteration 1
iteration 2
iteration 3
iteration 4
iteration 5
iteration 6
Error: No slot of name "reStruct" for this object of class "lme"
Error in logLik(object at reStruct) : Unable to find the argument "object" in
selecting a method for function "logLik"
>