Poisson deviance function
Y : array-like
Endogenous response variable
mu : array-like
Fitted mean response variable
scale : float, optional
An optional scale argument
deviance : float
The deviance function at (Y,mu) as defined below.
Notes
If a constant term is included it is defined as
deviance = 2*sum_i(Y*log(Y/mu))
scikits.statsmodels.family.family.Poisson.resid_dev
scikits.statsmodels.family.family.Poisson.loglike
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