def _normal_reference(self):
        X = np.std(self.data, axis=0)
        return 1.06 * X * self.nobs ** (- 1. / (4 + self.data.shape[1]))
Returns Scott's normal reference rule of thumb bandwidth parameter.
dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/nonparametric/_kernel_base.py/GenericKDE._normal_reference