# Bayes' theorem

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## Bayes' theorem

[bāz′]

Etymology: Thomas Bayes, British mathematician, 1702-1761

a mathematic statement of the relationships of test sensitivity, specificity, and the predictive value of a positive test result. The predictive value of the test is the number that is useful to the clinician. A positive result demonstrates the conditional probability of the presence of a disease.

## theorem

(the'o-rem) [Gr.**theorema**, principle arrived at by speculation]

A proposition that can be proved by use of logic, or by argument, from information previously accepted as being valid.

### Bayes' theorem

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