Hessian matrix of the likelihood function, evaluated at the given parameters
params : array_like
Array of parameters at which to evaluate the Hessian function.
transformed : boolean, optional
Whether or not params is already transformed. Default is True.
statsmodels.tsa.regime_switching.markov_regression.MarkovRegression.from_formula
statsmodels.tsa.regime_switching.markov_regression.MarkovRegression.information
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