On gradings for one — dimensional seismologic predictions |
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| Authors: | Weiping Qin |
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| Institution: | 1. Sichuan University, 610064, Chengdu, China
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| Abstract: | This paper gives a complete commentary on some popular gradings which based on the 2×2 contingency table, for one—dimensional seismologic prediction. It contains: - In view of the statistical correlation, the Wallen gradingV=√QS is the most equitable one amomg all gradings.
- Each one of the three gradings: Zhenchao Gu gradingS, Obuhov gradingQ and Shaoxie Xu gradingR, has its own inadequacy although they are so easy for use.
- A set of gradings can be derived fromV. The harmonic mean ofS andQ, H(S,Q) and the Hedike gradingS H are the members of this set. The order of some popular gradings are given in Theorem 5. 3.
- In view of the measure of the overlapping part a gradingW is introduced. Another set of gradings may be derived from it. The index of efficiencyh is the severest one among this set.
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