A relationship between the classical multiplicative pairwise comparisons that are based on aijaji = 1, the additive model based on bij+bji = 1, and qualitative pairwise comparisons that uses the relations ≈ (indifferent), ⊏ (slightly in favour of), ⊂ (in favour of), < ( strongly better) and ≺ (extremely better), is discussed in detail. A special attention is paid to the concept of consistency and weights calculations. An on-line tool is also discussed.
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