Probit model Hessian matrix of the log-likelihood
Parameters : | params : array-like
|
---|---|
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