scikits.statsmodels.family.family.Poisson.deviance

Poisson.deviance(Y, mu)

Poisson deviance function

Parameters:

Y : array-like

Endogenous response variable

mu : array-like

Fitted mean response variable

Returns:

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))

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