TABLE 4

Estimates of demographic parameters for humans and Drosophila

SpeciesPopulationData setN2/N1t/N2Log L
Homo sapiensAfricaPGAa2.7130
Europe0.671.446
AfricaEGPa2.1242
Europe0.891.20.8
D. melanogasterAfricaShapiro et al. (2007)202.416
Zimbabwe4.91.518
Non-Africa7.21.79.9
• Log L is the difference in log likelihood between the models that allow/do not allow a population size change. The initial population size, N1, was 20 for Drosophila and African humans; for European humans N1 was 100.

• a Likelihood increases toward a plateau as N2 increases for a given N1; the parameter values reported were for N2 = 1000.