In a typical prediction problem a person who has made observationsx1,x2,...,xt at time t has to answerthe question “What is xt+1?”. The starting pointof the analysis here is to modify this problem by considering for everypossible x a person that asks “Is xt+1=x?”
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机译：在典型的预测问题中，观察者
x 1 ，x 2 ，...，x t 在时间t必须回答
问题“ x t + 1 是什么？”。起点
分析的目的是通过考虑每个因素来修改此问题
x可能会问“ x t + 1 = x？”的人
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