Table 1 Summary statistics informative about AI examined in this study
StatisticDefinitionReference
pIAncestry in the recipient population introgressed from the donor population. This measurement is directly tracked in simulations using tree sequences.Kelleher et al. (2016), Kim et al. (2018)
RDAverage ratio of sequence divergence between an individual from the recipient and an individual from the donor population, and the divergence between an individual from the outgroup and an individual from the donor populationRacimo et al. (2017)
DPatterson’s D statistic, which measures the excess allele sharing between the recipient and donor population than between the recipient and an outgroup population that is unadmixed.Green et al. (2010)
fDA statistic that measures the excess allele sharing while controlling for local variation in ancestry in the recipient populationMartin et al. (2015)
U20/U50/U80Number of uniquely shared alleles between the recipient and donor population that are of frequency <1% in the outgroup, 100% in the donor, and more than 20/50/80% in the recipient populationRacimo et al. (2017)
Q90/Q9590/95% quantile of the distribution of derived allele frequencies in the recipient population, that are of frequency below 1% in the outgroup and 100% in the donor population.Racimo et al. (2017)
HeterozygosityExpected heterozygosity in the recipient population measured by the mean of 2*p*(1-p), with p being the frequency of any given allele in the recipient populationCrow et al. (1970)