gammaincInv

gammaincInv(p, a): number

Defined in: special.js:166

Inverse of the regularized lower incomplete gamma: x with P(a, x) = p. Halley-refined Newton from the Wilson-Hilferty starting point (following the approach in Numerical Recipes §6.2.1, reimplemented).

Parameters

p

number

Probability in [0, 1]

a

number

Shape, a > 0

Returns

number

x >= 0