a $                                                                                                Parameter, defined as$\beta =\sum _{i,k}\left(\left|\bar{B}\left(R_{i} \left(\pi _{S} \right),\sigma _{k} \right)\right|-\left|\bar{B}\left(R_{i} \left(\pi _{S} \right),\sigma _{k} \right)\right|^{0} \right) $