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Out-of-sample tests are subject to look-ahead bias when a forecaster constructs a model using an intuition derived from … quantitatively demonstrates the unintended look-ahead bias in out-of-sample tests …
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For two periods an expert E announces his forecast of the state to a decision-maker D who chooses action. They disagree about the precision of the probability assessments. At the end of period 1 the state is observed. In the last period E makes announcements more extreme than his forecasts....
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