Chunk #135 — STAR★Methods — Quantification and Statistical Analysis — Trinarization
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B(z; a, b) is the regularized incomplete beta function, B(a,b) is the beta function, and Γ is the gamma function. The formula was derived by evaluating Probability[x > f, {x ∖[Distributed] BetaDistribution[a + k, b + n - k]}] in Mathematica (version 10, Wolfram Research Inc.).