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Post-test probability
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To understand conceptually how Bayes' theorem estimates the posttest probability of disease, it is useful to examine a nomogram version of Bayes' theorem (Fig. 3-2). In this nomogram, the accuracy of the diagnostic test in question is summarized by the likelihood ratio , which is defined as the ratio of the probability of a given test result (e.g., "positive" or "negative") in a patient with disease to the probability of that result in a patient without disease.
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