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Artificial Intelligence  /  AI 0300  ·  Atom · ~20 seconds

Base-Rate Neglect

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Reading a flagged result from a 90-percent-accurate test as 90 percent certainty is base-rate neglect — accuracy answers a different question entirely.

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"How often does the test flag carriers?" is a share of the 40; "how often are the flagged carrying?" is a share of the 132.

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The questions face opposite directions; no manipulation of the first number alone answers the second.