) Dividing all the elements of the weighted sum matrix by
their respective priority vector element.
6) Compute the average of this value to obtain max .
7) Find the Consistency Index, CI, as follows:
1
max
n
n
CI
(1)
Where n is the matrix size.
8) Calculate the consistency ratio, CR, as follows:
9)
RI
CI CR
(2)
10) Judgment consistency can be checked by taking the
consistency ratio (CR) of CI with the appropriate value
in Table 2. The CR is acceptable, if it does not exceed
0.10. If it is more, the judgment matrix is inconsistent.
To obtain a consistent matrix, judgments should be
reviewed and improved.