Poisson model Hessian matrix of the loglikelihood
params : array-like
The parameters of the model
hess : ndarray, (k_vars, k_vars)
The Hessian, second derivative of loglikelihood function, evaluated at params
Notes
where the loglinear model is assumed
statsmodels.discrete.discrete_model.Poisson.from_formula
statsmodels.discrete.discrete_model.Poisson.information
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