statsmodels.genmod.qif.QIF.objective¶
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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.