statsmodels.discrete.discrete_model.Poisson.loglike

Poisson.loglike(params)

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

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