statsmodels.discrete.discrete_model.Poisson.loglike¶
- Poisson.loglike(params)[source]¶
Loglikelihood of Poisson model
- Parameters:
- paramsarray_like
The parameters of the model.
- Returns:
- loglike
float The log-likelihood function of the model evaluated at params. See notes.
- loglike
Notes
\[\ln L=\sum_{i=1}^{n}\left[-\lambda_{i}+y_{i}x_{i}^{\prime}\beta-\ln y_{i}!\right]\]