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Article

Coalescent theory of the ψ directionality index.

G3 (Bethesda, Md.) - 12 Nov 2025

Lappo Egor, Rosenberg Noah A

Abstract excerpt

The ψ directionality index was introduced by Peter and Slatkin (Evolution 67: 3274-3289, 2013) to infer the direction of range expansions from single-nucleotide polymorphism variation. Computed from the joint site frequency spectrum for two populations, ψ uses shared genetic variants to measure the difference in the amount of genetic drift experienced by the populations, associating excess drift with greater...

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PMID: 40919609
DOI: 10.1093/g3journal/jkaf202
PMCID: PMC12611255

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