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

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

        Returns
        -------
        resid_anscombe : array
            The Anscome residuals for the Poisson family defined below

        Notes
        -----
        .. math::

           resid\_anscombe_i = (3/2) * (Y_i^{2/3} - \mu_i^{2/3}) / \mu_i^{1/6}
        """
        return (2. / 3) * (endog**(2/3.) - mu**(2 / 3.)) / mu**(1 / 6.)
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