For the ABS rule we have basically to make a summation of the absolute values, so the formula is simply:

Rtot = Σ|Ri|

When considering it together with the RM superposition method, to get corresponding values, we also have to check the sign of the leading value and decide, whether the Eigenvector shall be directly superimposed or with a reversed sign. in order to maximize or minimize the leading value. So, when denoting Rl,i as the result value of the leading component, and Rk,i as the result values of the concomitant components. we get for the total response Rtot:

Rtot,max = Σ (Rl,i*sgn(Rl,i)) Rtot,min = - Σ (Rl,i*sgn(Rl,i))

Rtot,con = Σ (Rk,j*sgn(Rl,i)) Rtot,con = - Σ (Rk,j*sgn(Rl,i))