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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク log5 ： ウィキペディア英語版 log5 Log 5 is a formula invented by Bill James to estimate the probability that team A will win a game, based on the true winning percentage of Team A and Team B. It is equivalent to the Bradley-Terry-Luce model used for paired comparisons, the Elo rating system used in chess and the Rasch model used in the analysis of categorical data. Let $p\_i$ be the fraction of games won by team $i$ and also let $q\_i\; =\; 1-p\_i$ be the fraction of games lost by team $i$. The Log5 estimate for the probability of A defeating B is $p\_\; =\; \backslash frac.$ A few notable properties *If $p\_A\; =\; 1$, Log5 will always give A a 100% chance of victory *If $p\_A\; =\; 0$, Log5 will always give A a 0% chance of victory *If $p\_A\; =\; p\_B$, Log5 will always return a 50% chance of victory for either side *If $p\_A\; =\; 1/2$, Log5 will give A a $1-p\_B$ probability of victory. It may also be conveniently rewritten using the odds ratio〔 as $\backslash frac\}\; =\; \backslash frac\backslash times\; \backslash frac.$ Here as before $q\_=1-p\_$. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「log5」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.