Compute the score function at params.
Parameters: | params : array_like
*args, **kwargs :
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Returns: | score : array
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Notes
This is a numerical approximation, calculated using first-order complex step differentiation on the loglike method.
Both *args and **kwargs are necessary because the optimizer from fit must call this function and only supports passing arguments via *args (for example scipy.optimize.fmin_l_bfgs).