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statsmodels.miscmodels.count.PoissonZiGMLE.nloglikeobs

PoissonZiGMLE.nloglikeobs(params)[source]

Loglikelihood of Poisson model

Parameters:

params : array-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]

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