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Dispersion Parameter

Prometheus
in Applied Mathematics

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I have the understanding that the dispersion parameter, [latex] \phi[/latex], in generalised linear models needs to be known for deviance to meaningful or otherwise it can be estimated from the model, but no analysis of deviance can be carried out.

 

Why is it then that in binomial and poisson models in R/S+ it is always assumed [latex] \phi = 1[/latex]? If the assumption is not true then the analysis in meaningless, no?

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