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- W2950245794 abstract "The first terms of the Wright-Fisher (WF) site frequency spectrum that follow the coalescent approximation are determined precisely, with a view to understanding the accuracy of the coalescent approximation for large samples. The perturbing terms show that the probability of a single mutant in the sample (singleton probability) is elevated in WF but the rest of the frequency spectrum is lowered. A part of the perturbation can be attributed to a mismatch in rates of merger between WF and the coalescent. The rest of it can be attributed to the difference in the way WF and the coalescent partition children between parents. In particular, the number of children of a parent is approximately Poisson under WF and approximately geometric under the coalescent. Whereas the mismatch in rates raises the probability of singletons under WF, its offspring distribution being approximately Poisson lowers it. The two effects are of opposite sense everywhere except at the tail of the frequency spectrum. The WF frequency spectrum begins to depart from that of the coalescent only for sample sizes that are comparable to the population size. These conclusions are confirmed by a separate analysis that assumes the sample size n to be equal to the population size N. Partly thanks to the canceling effects, the total variation distance of WF minus coalescent is 0.12∕logN for a population sized sample with n=N, which is only 1% for N=2×104. The coalescent remains a good approximation for the site frequency spectrum of-large samples." @default.
- W2950245794 created "2019-06-27" @default.
- W2950245794 creator A5053679476 @default.
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- W2950245794 date "2018-12-01" @default.
- W2950245794 modified "2023-10-10" @default.
- W2950245794 title "The Wright–Fisher site frequency spectrum as a perturbation of the coalescent’s" @default.
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- W2950245794 doi "https://doi.org/10.1016/j.tpb.2018.09.005" @default.
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