statsmodels.miscmodels.count.PoissonGMLE.nloglikeobs

PoissonGMLE.nloglikeobs(params)

Loglikelihood of Poisson model

Parameters:

paramsarray_like

The parameters of the model.

Returns:

ndarray

The negative log likelihood of the model evaluated at params for each observation.

Notes

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