statsmodels.discrete.count_model.ZeroInflatedPoisson.loglike¶

ZeroInflatedPoisson.loglike(params)¶

Loglikelihood of Generic Zero Inflated model.

Parameters:¶

paramsarray_like

The parameters of the model.

Returns:¶

loglikefloat

The log-likelihood function of the model evaluated at params. See notes.

Notes

\[\ln L=\sum_{y_{i}=0}\ln(w_{i}+(1-w_{i})*P_{main\_model})+ \sum_{y_{i}>0}(\ln(1-w_{i})+L_{main\_model}) where P - pdf of main model, L - loglike function of main model.\]