Fit method for likelihood based models
start_params : array-like, optional
An optional
method : str
Method can be ‘newton’, ‘bfgs’, ‘powell’, ‘cg’, or ‘ncg’. The default is newton. See scipy.optimze for more information.
scikits.statsmodels.model.LikelihoodModel
scikits.statsmodels.model.LikelihoodModel.hessian
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