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A contingency table from a hypothetical study. This table gives the number of patients who have disease, the number who do not, and how many of each of those tested positively. In many clinical studies only t and f are known.
| Diagnostic Test Positive |
Negative | Sum | ||
|---|---|---|---|---|
| Patient state | Diseased | t, true positives | u, false negatives | n |
| Not Diseased | f, false positives | υ, true negatives | m |
