TABLE 2.

Accuracy of parentage and sibship inference for the human CEPH data set

		Colony2		Pairwise methods
	No. loci	P(FS | FS)	P(PO | PO)	P(FS | FS)	P(PO | PO)
Sex and age known	2	0.9473	0.9364	0.8073	0.0078
	3	0.9818	0.9876	0.8734	0.2666
	4	1.0000	1.0000	0.8696	0.7860
	5	1.0000	1.0000	0.8936	0.8837
Sex and age unknown	2	0.5266	0.2538
	3	0.7164	0.3356
	4	0.8407	0.4519
	5	0.9228	0.8316
	10	1.0000	0.9746

P(FS | FS) and P(PO | PO) are frequencies that full-sib dyads and parent–offspring dyads are inferred as such. The probabilities that a random unrelated individual is excluded as a parent of an offspring are 0.971015, 0.994597, 0.998701, 0.999717, and 0.999999 when the numbers of loci are 2, 3, 4, 5 and 10, respectively.