def resid_anscombe(self, endog, mu):
        r"""
        The Anscombe residuals for Gamma exponential family distribution

        Parameters
        ----------
        endog : array
            Endogenous response variable
        mu : array
            Fitted mean response variable

        Returns
        -------
        resid_anscombe : array
            The Anscombe residuals for the Gamma family defined below

        Notes
        -----
        .. math::

           resid\_anscombe_i = 3 * (Y_i^{1/3} - \mu_i^{1/3}) / \mu_i^{1/3}
        """
        return 3 * (endog**(1/3.) - mu**(3./1)) / mu**(1/3.)
dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/genmod/families/family.py/Gamma.resid_anscombe/swapped operands of `/`