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Bayes Theorem (Wiki)

Status: approved · Version: v1.2 · Last review: 2026-02-15

Definition

Bayes theorem updates probabilities after observing evidence: P(A|B)=P(B|A)P(A)/P(B).

Community notes

  • Added a base-rate fallacy example from medical screening.
  • Expanded notes on prior selection and interpretation.

Edit history

  • v1.2 (approved): Added clinical screening example.
  • v1.1 (approved): Clarified symbol definitions.
  • v1.0 (approved): Initial publication.