statsmodels.miscmodels.count.PoissonZiGMLE.nloglikeobs¶

PoissonZiGMLE.nloglikeobs(params)[source]¶

Loglikelihood of Poisson model

Parameters:¶

params : array_like¶

The parameters of the model.

Return type:¶

The log likelihood of the model evaluated at params

Notes

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