Table 5 Linguistic conversion scale with corresponding PHFEs.

Very highest

{\(\langle 0.8, 0.3 \rangle\)} − {\(\langle 1.0, 0.7 \rangle\)}

Highest

{\(\langle 0.7, 0.5 \rangle\)} − {\(\langle 0.8, 0.5 \rangle\)}

Moderate

\(\{\langle 0.5, 0.6 \rangle\)} − {\(\langle 0.7, 0.4 \rangle\)}

Lowest

{\(\langle 0.3, 0.3 \rangle\)} − {\(\langle 0.5, 0.8 \rangle\)}

Very lowest

{\(\langle 0.1, 0.2 \rangle\)} − {\(\langle 0.3, 0.8 \rangle\)}