Appendix A: Ranking and Grading
Methodology
Rankings
Where ever possible, rankings are developed from quantitative data contained within the report. An initial ranking is made using the data range and an interval equal to the range divided by three.
Table A.1
| High | High − | Average+ | Average | Average− | Lowest+ | Lowest |
|---|---|---|---|---|---|---|
| Best | High minus 0.2 × Interval | Average plus 0.6 × Interval | (Best plus Worst)/2 | Average minus 0.2 × Interval | Lowest plus 0.6 × Interval | Worst |
The preceding is transposed into the following standardized scoring system.
Table A.2
The ranking system employs rather wide ranges aimed at recognizing the inherent uncertainties ...
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