January 2020
Beginner to intermediate
728 pages
10h 26m
Japanese
Content preview from データサイエンス設計マニュアル
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98 4 章 スコアとランキング
ガルリ・カスパロフ
(
2851
)
スティーブン・スキーナ
(
1200
)
ユディット・ポルガー
(
2735
)
マグヌス・カールセン
(
2882
)
スティーブン・スキーナ
K=2771
S=1280
ユディット・ポルガー
P=2790
C=2827
ユディット・ポルガー
P=2790
S=1280
図 4 -6 架空のチェストーナメントの結果を反映したイロスコアの変化
彼女はポイントを獲得していない。イロレーティングは、ポイントが勝利だけでなく番狂わせにも対応でき
ているという点でとても優れている。
4.4.2 ランキングのマージ
身
長などの 1 つの特徴 f があれば、すべての A と B の組合せで f(A) > f (B) が正しいかどうかをテス
トすることにより、n 個の要素の間で
n
2
個の比較結果を得ることができる。これらの対をイロレーティン
グに送り込めばランキングが得られるが、これはものの考え方として間違っている。そのような分析の結果
は、単純に f のソート順を反映したものにしかならない。
しかし、複数の異なる特徴のランキングを 1 つにまとめようとすると、もっと面白い問題になる。ここ
で、i 番目の特徴を上位から並べたものを対象要素の順列 P
i
と定義する。そして、要素順列 P
1
, . . . , P
k
を
最もよく反映した総合順列 P を作ることを目指す。
総合順列を作るためには、2 つの順列の類似性を測定する距離関数を定義する必要がある。スピアマンの
順位相関係数（ ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.