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Table 2 Linguistic scales and the grey numbers used for the pairwise comparisons of grey AHP

From: An integrated grey AHP-MOORA model for ameliorating public transport service quality

Importance value Linguistic scales Grey number
1 Equally Important [1, 2]
3 Weakly Important [2, 4]
5 Important [4, 6]
7 Strongly Important [6, 8]
9 Absolutely Important [8, 9]