# statsmodels.discrete.discrete_model.Probit.score_obs¶

Probit.score_obs(params)[source]

Probit model Jacobian for each observation

Parameters: params (array-like) – The parameters of the model jac – The derivative of the loglikelihood for each observation evaluated at params. array-like

Notes

$\frac{\partial\ln L_{i}}{\partial\beta}=\left[\frac{q_{i}\phi\left(q_{i}x_{i}^{\prime}\beta\right)}{\Phi\left(q_{i}x_{i}^{\prime}\beta\right)}\right]x_{i}$

for observations $$i=1,...,n$$

Where $$q=2y-1$$. This simplification comes from the fact that the normal distribution is symmetric.