statsmodels.genmod.qif.QIF.objective¶
method
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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.