Possible outcomes for two records from different files
| Records truly are from the same person | Records truly are not from the same person | |
|---|---|---|
| At least theoretically, these lead to the concepts of sensitivity = TM/(TM+FU), specificity = TU/(TU+FM), PPV = TM/(TM+FM), NPV = TU/(TU+FU). | ||
| Records matched | Truly matched (TM) | Falsely matched (FM) |
| Records not matched | Falsely unmatched (FU) | Truly unmatched (TU) |