相撲の八百長って国際的に有名

相撲の八百長って、国際的に有名なんだよね。「ヤバい経済学」に詳細な数理的な分析が出てるくらいで。今回の事件で、実証されてしまった訳だけど。
それにしても清瀬海、杜撰だねえ。学生相撲上がりのエリートってああなっちゃうのかなあ、輪島といい。輪島も日大相撲部出身だもんなあ。

In a sumo tournament, all wrestlers in the top division compete in 15 matches and face demotion if they do not win at least eight of them. The sumo community is very close-knit, and the wrestlers at the top levels tend to know each other well. The authors looked at the final match, and considered the case of a wrestler with seven wins, seven losses, and one fight to go, fighting against an 8-6 wrestler. Statistically, the 7-7 wrestler should have a slightly below even chance, since the 8-6 wrestler is slightly better. However, the 7-7 wrestler actually wins around 80% of the time. Levitt uses this statistic and other data gleaned from sumo wrestling matches, along with the effect that allegations of corruption have on match results, to conclude that those who already have 8 wins collude with those who are 7-7 and let them win, since they have already secured their position for the following tournament. Despite round condemnation of the claims by the Japan Sumo Association following the books publication in 2005, the 2011 Grand tournament in Tokyo was cancelled for the first time since 1946 because of allegations of match fixing.[4]

http://en.wikipedia.org/wiki/Freakonomics