Poisson deviance residual
Y : array-like
Endogenous response variable
mu : array-like
Fitted mean response variable
scale : float, optional
An optional argument to divide the residuals by scale
resid_dev : array
Deviance residuals as defined below
Notes
resid_dev = sign(Y-mu)*sqrt(2*Y*log(Y/mu)-2*(Y-mu))
sm.genmod.families.family.Poisson.resid_anscombe
sm.genmod.families.family.Poisson.starting_mu
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