Derivative of C-Log-Log transform link function

        Parameters
        ----------
        p : array-like
            Mean parameters

        Returns
        -------
        g'(p) : array
            The derivative of the CLogLog transform link function

        Notes
        -----
        g'(p) = - 1 / ((p-1)*log(1-p))

def deriv(self, p):
        """
        Derivative of C-Log-Log transform link function

        Parameters
        ----------
        p : array-like
            Mean parameters

        Returns
        -------
        g'(p) : array
            The derivative of the CLogLog transform link function

        Notes
        -----
        g'(p) = - 1 / ((p-1)*log(1-p))
        """
        p = self._clean(p)
        return 1. / ((p - 1) * (np.log(1 - p)))