[R] GAM: Remedial measures

[Jean G. Orelien]

I fitted a GAM model with Poisson distribution to a data with about 200
observations.  I noticed that the plot of the residuals versus fitted values
show a trend.  Residuals tend to be lower for higher fitted values. Because,
I'm dealing with count data, I'm thinking that this might be due to
overdispersion.  Is there a way to account for overdispersion in any of the
packages MGCV or GAM?  

 

I welcome any suggestions that one may have on this topic.

 

Jean