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inconsistencies
2011 Nov 18
0
NB and poisson glm models: three issues
Hi,
I fit both Poisson and NB (negative binomial) models to some empirical data.
Although models provide me with sensible parameters, in the case of the NB
models i get three inconsistencites:
- First, the total number of occurrences predicted by the model (i.e.
fitted(fit)) is much greater than those of the data. I realise that poisson
and NB models are different in the sense that expectations for the NB model
do not need to be equal (however the over-estimation of the NB model is to...