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The RI is obtained from Table 6, established by Oak Ridge National Laboratory, for a matrix with dimensions from 1 to 15 (Saaty 1980). If the CR is less than 0.1, inconsistency among DMs is at an acceptable level (Saaty 1980).

Table 6

Values of RI according to dimensions of the matrix (n)

n12345678915
RI 0.00 0.00 0.58 0.90 1.12 1.24 1.32 1.41 1.45 … 1.59
n12345678915
RI 0.00 0.00 0.58 0.90 1.12 1.24 1.32 1.41 1.45 … 1.59

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