statsmodels.othermod.betareg.BetaModel.score_factor¶

BetaModel.score_factor(params, endog=None)[source]¶

Derivative of loglikelihood function w.r.t. linear predictors.

This needs to be multiplied with the exog to obtain the score_obs.

Parameters:¶

params : ndarray¶

Parameter at which score is evaluated.

Returns:¶

score_factor – A 2d weight vector used in the calculation of the score_obs.

Return type:¶

ndarray, 2-D

Notes

The score_obs can be obtained from score_factor sf using

• d1 = sf[:, :1] * exog

• d2 = sf[:, 1:2] * exog_precision