Deviance function for either Bernoulli or Binomial data.
Y : array-like
Endogenous response variable (already transformed to a probability if appropriate).
mu : array
Fitted mean response variable
deviance : float
The deviance function as defined below
scikits.statsmodels.family.family.Binomial.devresid
scikits.statsmodels.family.family.Binomial.initialize
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