[R] help with glmmPQL

From: Matthew A. Krutky <m-krutky_at_northwestern.edu>
Date: Tue 15 Aug 2006 - 01:19:14 EST

Hello Folks-  

Is there a way to create confidence bands with 'glmmPQL' ???  

I am trying to decide a way to best plot the model which we created with the glmmPQL function in R. I would like
to plot my actual averaged data points within 95 % confidence intervals from the model. Plotting
the model is easy, but determining confidence bands is not.  

Here is my model:  

ratiomodel<-glmmPQL(ratio~as.factor(joint)*time, random = ~ 1 | subject, family = Gamma(link =

If I use 'lm' and pass the command 'int = "c" ' 'to create this model I can easily find and plot this type of confidence band for 'ratio~time'. But I need to take into account 'as.factor(joint)', and in fact I can produce confidence bands with 'glm' by passing in 'se.fit = TRUE', but the problem is I need to
make subject a random variable, and take into account my ratio with the Gamma distribution.  

Is there a way to create confidence bands with 'glmmPQL' ??? ' as.factor(joint)' has 3 levels, so I
would like to produce this linear model with three levels and confidence bands for comparison of
the levels of 'joint'.  

Any Help at all with my problem would be greatly appreciated!!

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