The loglikelihood function for the negative binomial family.
Y : array-like
Endogenous response variable
fittedvalues : array-like
The linear fitted values of the model. This is dot(exog,params).
llf : float
The value of the loglikelihood function evaluated at (Y,mu,scale) as defined below.
scikits.statsmodels.family.family.NegativeBinomial.deviance
scikits.statsmodels.family.family.NegativeBinomial.resid_anscombe
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