statsmodels.miscmodels.count.PoissonZiGMLE.nloglikeobs

PoissonZiGMLE.nloglikeobs(params)

Loglikelihood of Poisson model

Parameters

paramsarray_like

The parameters of the model.

Returns

The log likelihood of the model evaluated at params

Notes

$$\ln L=\sum_{i=1}^{n}\left[-\lambda_{i}+y_{i}x_{i}^{\prime}\beta-\ln y_{i}!\right]$$