statsmodels.genmod.qif.QIF.objective

method

QIF.objective(params)[source]

Calculate the gradient of the QIF objective function.

Parameters:

params : array-like

The model parameters at which the gradient is evaluated.

Returns:

grad : array-like

The gradient vector of the QIF objective function.

gn_deriv : array-like

The gradients of each estimating equation with respect to the parameter.