Expected Gain - Kitairieki

Japanese: 期待利得 - きたいりえき
Expected Gain - Kitairieki

...Therefore, the payoffs in this case are as shown in the table. Criteria for selecting the optimal action include (1) a pessimistic criterion (maximin criterion) that compares the payoffs when the worst case scenario occurs when each action is taken and selects the action that maximizes it, (2) an optimistic criterion (maxmax criterion) that selects the action that maximizes the payoff when the best case scenario occurs, and (3) an intermediate criterion that selects the action with the largest expected payoff (average payoff). Each individual or company should decide which criterion to apply. ...

*Some of the terminology explanations that mention "expected gain" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…したがって,この場合の利得は表のようになる。最適な行動を選択するための基準としては,(1)各行動をとったときに最悪の状態が実現した場合の利得を比較して,それが最大になる行動を選ぶという悲観的な基準(マクシミン基準),(2)最良の状態が実現した場合の利得が最大になる行動を選ぶという楽観的な基準(マックスマックス基準),(3)期待利得(利得の平均値)が最大の行動を選ぶという中間的な基準,などがある。どの基準を適用するかは,各人あるいは各企業等が決めるべきことである。…

※「期待利得」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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