Thank you all for the answers. I'll be careful with this kind of models
till I learn how they work...
By the way, I have realized that, comparing a Poisson model with a
quasi-Poisson model, the estimated SE of the coefficients in the
quasi-Poisson model are the SE of the Poisson model times the scale
parameter of the quasi-Poisson model. I guess that this is related with
Bolker's statement of dividing the LRT by the scale parameter to obtain
the quasi-likelihood.
Kind regards.
--
Albert Romero Puente
Departament de Biologia Vegetal-Botànica
Universitat de Barcelona
Facultat de Biologia
3a Planta
Av. Diagonal, 645. (08028) Barcelona
Tel. 0034 93 402 14 71
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