statsmodels.miscmodels.count.PoissonZiGMLE.nloglikeobs¶

PoissonZiGMLE.nloglikeobs(params)[source]¶

Loglikelihood of Poisson model

Parameters:¶

paramsarray_like

The parameters of the model.

Returns:¶

The log likelihood of the model evaluated at params

Notes

$$\ln L=\sum _{i=1}^n[-{\lambda }_i+y_i{x}_i^{\prime }\beta -\ln y_i!]$$