Table 1.

Comparing the tripartite admixture model to individual two-way models in the southern Ryukyu Islands. The fitness of the tripartite structure for ‘Nagabaka_H’ is compared with every possible combination of two-way models of the three proposed ancestral sources (Jomon, Northeast Asian and East Asian ancestry). P-values lower than 0.05 show that the two-way model is significantly less likely to fit than the three-way model.

Left populations: Target: Nagabaka_H Sources:  • Jomon  • NEA (WLR_BA_o and HMMH_MN)  • EAS (Han)	Degrees of freedom	Tail probability	χ2	p-Value for the nested model (two-way vs. three-way model)
Models
Three-way (Jomon, NEA, and EAS)	5	5.91 × 10−1	3.718	—
Two-way (Jomon and NEA)	6	8.57 × 10−6	33.454	4.95 × 10−8
Two-way (Jomon and EAS)	6	6.09 × 10−2	12.047	3.90 × 10−3
Two-way (NEA and EAS)	6	2.73 × 10−5	30.831	1.92 × 10−7