Gamma deviance function
Y : array-like
Endogenous response variable
mu : array-like
Fitted mean response variable
scale : float, optional
An optional scale argument
deviance : float
Deviance function as defined below
Notes
deviance = 2*sum((Y - mu)/mu - log(Y/mu))
sm.genmod.families.family.Gamma
sm.genmod.families.family.Gamma.fitted
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