statsmodels.miscmodels.count.PoissonZiGMLE.nloglikeobs¶

PoissonZiGMLE.nloglikeobs(params)[source]¶

Loglikelihood of Poisson model

Parameters:	params (array-like) – The parameters of the model.
Returns:
Return type:	The log likelihood of the model evaluated at params

Notes

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