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Reference.org
Decision rule
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<p> In <a href="/facts/Decision_theory/TbXcQX0v">decision theory</a>, a decision rule is a function which maps an observation to an appropriate action. Decision rules play an important role in the theory of <a href="/facts/Statistics/DNPsKGYU">statistics</a> and <a href="/facts/Economics/HYctA2Dn">economics</a>, and are closely related to the concept of a <a href="/facts/Strategy_(game_theory)/VEXD1jyj">strategy</a> in <a href="/facts/Game_theory/zkEIj1ya">game theory</a>. </p><p>In order to evaluate the usefulness of a decision rule, it is necessary to have a <a href="/facts/Loss_function/xv5ozuhl">loss function</a> detailing the outcome of each action under different states. </p>