InverseBetaRegularized[s, a, b] gives the inverse of the regularized incomplete beta function.
Mathematical function (see Section A.3.10).
With the regularized incomplete beta function defined by , InverseBetaRegularized[s, a, b] is the solution for in .
InverseBetaRegularized[, s, a, b] gives the inverse of BetaRegularized[, z, a, b].
Note that the arguments of InverseBetaRegularized are arranged differently than in InverseGammaRegularized.
See The Mathematica Book: Section 3.2.10.
See also: InverseGammaRegularized, InverseErf.
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