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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 : float

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

Notes

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

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