[R] negative value for AIC and BIC

Hi all, I obtained negative values for AIC and BIC criteria for a particular model that I have developped... I don't remember to have negative values for these crietria for others applications, so I am a little suprised... Could anyone tell me if something is wrong or his conclusion

[R] exemples, tutorial on lmer

Hi all, I have some difficulties to work with the function lmer from lme4 Does somebody have a tutorial or different examples to use this function? Thanks, Oliver. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help

[R] lmer and scale parameter in glmm model

Hi all, I try to fit a glmm model with binomial distribution and I would to verify that the scale parameter is close to 1... the lmer function gives the following result : Estimated scale (compare to 1 ) 0.766783 But I would like to know how this estimation (0.766783) is performed, and I

[R] estimation of dispersion parameter in GLM

Hi all, I have some difficulties to understand how the dispersion parameter is estimated in GLM models. Suppose I want to fit a quasibinomial model and mydata$W are the weigths for this model. I suppose that I have p parameters in model myModel and n observations. Model is estimated with :