def hessian_factor(self, params, observed=True):
    'Derivatives of loglikelihood function w.r.t. linear predictors.\n        '
    (_, hf) = self.score_hessian_factor(params, return_hessian=True, observed=observed)
    return hf
Derivatives of loglikelihood function w.r.t. linear predictors.
def hessian_factor(self, params, observed=True):
    '\n        '
    (_, hf) = self.score_hessian_factor(params, return_hessian=True, observed=observed)
    return hf