7.2.3.3.7.1. statsmodels.genmod.families.family.Poisson.deviance¶

Poisson.deviance(endog, mu, scale=1.0)[source]¶

Poisson deviance function

Parameters:	endog : array-like Endogenous response variable mu : array-like Fitted mean response variable scale : float, optional An optional scale argument
Returns:	deviance : float The deviance function at (endog,mu) as defined below.

Notes

If a constant term is included it is defined as

\(deviance = 2*\sum_{i}(Y*\log(Y/\mu))\)