# statsmodels.genmod.generalized_estimating_equations.NominalGEE.mean_deriv¶

NominalGEE.mean_deriv(exog, lin_pred)[source]

Derivative of the expected endog with respect to the parameters.

Parameters
exogarray_like

The exogeneous data at which the derivative is computed, number of rows must be a multiple of ncut.

lin_predarray_like

The values of the linear predictor, length must be multiple of ncut.

Returns
The derivative of the expected endog with respect to the
parameters.