Tweedie.deviance()

statsmodels.genmod.families.family.Tweedie.deviance

Tweedie.deviance(endog, mu, freq_weights=1.0, scale=1.0) [source]

Returns the value of the deviance function.

Parameters:	endog : array-like Endogenous response variable mu : array-like Fitted mean response variable freq_weights : array-like 1d array of frequency weights. The default is 1. scale : float, optional An optional scale argument. The default is 1.
Returns:	deviance : float Deviance function as defined below

Notes

When ,

when and

otherwise.

When ,

For all other p,

Once is calculated, then calculate deviance as