Effective Population Size - Variance Effective Size

Variance Effective Size

In the Wright-Fisher idealized population model, the conditional variance of the allele frequency, given the allele frequency in the previous generation, is

Let denote the same, typically larger, variance in the actual population under consideration. The variance effective population size is defined as the size of an idealized population with the same variance. This is found by equating with and solving for which gives

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