''

def kappa_pairwise(self, cA, cB):

    Ae = self.Ae_kappa(cA, cB)
    ret = ((self.Ao(cA, cB) - Ae) / (1.0 - Ae))
    log.debug(u'Expected    agreement    between    %s    and    %s:    %f', cA, cB, Ae)
    return ret
