Table 1.

Linkage accuracy.

	True match status
	Match (pair from same individual)	Non-match (pair from different individuals)
Assigned link status
Link	True match a	False match b
Non-link	Missed match c	True non-match d

Sensitivity (or recall) = a/(a + c); specificity = d/(b + d); positive predictive value (or precision) = a/(a + b); negative predictive value = d/(c + d).