Table 1 Judgment matrix scaling and its interpretation.

9-level scale	Interpretation (comparing the importance of evaluation indicators with $\:r_{i}$vs. $\:{r}_{j}\:$)
1	Evaluation indicator $\:{r}_{i}$ is as important as$\:\:{r}_{j}$
3	Evaluation indicator $\:{r}_{i}$ is slightly more important than $\:{r}_{j}$
5	Evaluating Indicators $\:{r}_{i}$ and $\:{r}_{j}$ is significantly important
7	Evaluation metrics $\:{r}_{i}$ and$\:{r}_{j}$ are strongly important
9	Evaluation metrics $\:{r}_{i}$ and $\:{r}_{j}$ are extremely important
2,4,6,8	Median value of upper neighboring scales
reciprocal	When the evaluation indicator $\:{r}_{i}$ is compared with$\:{r}_{j}$, its judgment value is $\:{\:\:C}_{JI}=\raisebox{1ex}{$1$}\!\left/\:\!\raisebox{-1ex}{${\:\:C}_{IJ}$}\right.\:,{\:\:C}_{JI}=1$

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9-level scale	Interpretation (comparing the importance of evaluation indicators with \(\:r_{i}\)vs. \(\:{r}_{j}\:\))
1	Evaluation indicator \(\:{r}_{i}\) is as important as\(\:\:{r}_{j}\)
3	Evaluation indicator \(\:{r}_{i}\) is slightly more important than \(\:{r}_{j}\)
5	Evaluating Indicators \(\:{r}_{i}\) and \(\:{r}_{j}\) is significantly important
7	Evaluation metrics \(\:{r}_{i}\) and\(\:{r}_{j}\) are strongly important
9	Evaluation metrics \(\:{r}_{i}\) and \(\:{r}_{j}\) are extremely important
2,4,6,8	Median value of upper neighboring scales
reciprocal	When the evaluation indicator \(\:{r}_{i}\) is compared with\(\:{r}_{j}\), its judgment value is \(\:{\:\:C}_{JI}=\raisebox{1ex}{$1$}\!\left/\:\!\raisebox{-1ex}{${\:\:C}_{IJ}$}\right.\:,{\:\:C}_{JI}=1\)

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