def cumulative_value(self, slip_moment, mmax, mag_value, bbar, dbar):
        '''
        Returns the rate of events with M > mag_value

        :param float slip_moment:
            Product of slip (cm/yr) * Area (cm ^ 2) * shear_modulus (dyne-cm)
        :param float mmax:
            Maximum magnitude
        :param float mag_value:
            Magnitude value
        :param float bbar:
            \bar{b} parameter (effectively = b * log(10.))
        :param float dbar:
            \bar{d} parameter
        '''
        delta_m = mmax - mag_value
        a_2 = self._get_a2(bbar, dbar, slip_moment, mmax)
        return a_2 * (np.exp(bbar * delta_m) - 1.) * (delta_m > 0.0)
Returns the rate of events with M > mag_value

        :param float slip_moment:
            Product of slip (cm/yr) * Area (cm ^ 2) * shear_modulus (dyne-cm)
        :param float mmax:
            Maximum magnitude
        :param float mag_value:
            Magnitude value
        :param float bbar:
            \bar{b} parameter (effectively = b * log(10.))
        :param float dbar:
            \bar{d} parameter