statsmodels.discrete.discrete_model.Poisson.loglike

Poisson.loglike(params) [source]

Loglikelihood of Poisson model

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

Notes

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