Probit model Hessian matrix of the log-likelihood
Parameters: | params : array-like
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Returns: | The Hessian evaluated at `params` : |
Notes
where
.. math:: lambda_{i}=frac{q_{i}phileft(q_{i}x_{i}^{prime}betaright)}{Phileft(q_{i}x_{i}^{prime}betaright)}
and