Step 4-2 (obtain the inner dependence matrix T’ ). When the total-influence matrix T is produced, in [16, 17], an inner dependence matrix T’ is acquired by normalizing the matrix T so that each column sum is equal to 1. But, in [18], the inner dependence matrix T’ is derived based on the threshold value θ and only the factors whose effects in the matrix T are larger than θ are shown in the matrix T’.