WAM - Weighted Arithmetic Mean

1. 1. Validate weights satisfy Σw_j = 1 and w_j ≥ 0.

   $$\sum _{j=1}^n{w}_j=1,w_j\ge 0$$

2. 2. Weighted arithmetic mean WAM(x_1,…,x_n) = Σ w_j x_j.

   $$\text{WAM}(x_1,\dots ,x_n)=\sum _{j=1}^n{w}_j{x}_j$$

3. 3. Apply WAM per alternative; descending ranking.

   $$S_i=\sum _{j=1}^n{w}_j{x}_{ij},i=1,\dots ,m$$