[R] gamm and binomial data

From: Piet Bell <pj.bell_at_yahoo.co.uk>
Date: Tue 04 Jul 2006 - 08:05:08 EST


  I have a response variable that is a time series of 0's and 1's. And a couple of continous explanatory variables.    

  I would like to fit a gamm with auto-correlation and binomial distribution using gamm in mgcv. Something simple like:    

  tmp<-gamm(y ~ s(x), correlation=corAR1(), binomial)    

  However, I read in various messages on this newsgroup that glmmPQL (used by gamm) is using an overdispersion parameter.    

  Does this make my approach invalid?    

  Thanks for any answer,
  Piet Bell                          

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