statsmodels.genmod.qif.QIF.objective¶

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.