[R-sig-eco] GLM mixed model with quasibinomial family

Javier Martinez javi.martinez.lopez at gmail.com
Wed Jul 28 18:44:12 CEST 2010

Dear R-users,

I am using the 'lmer' function from package 'lme4', looking for a
regression model which takes into account the grouped nature of my
data. I am using frequencies as the dependent variable and percentages
as the independent one. After some reading I think I should use the
'quasibinomial' family because there is 'overdispersion' in my data
set (greater residual deviance than residual degrees of freedom). So,
I test this regression model but I do not get a significance p-value
for the regression! I have to test many different regressions with
different data, so how can I assess the significance of each of of

Thank you very much for your help!


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