This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English version of the page.

Note: This page has been translated by MathWorks. Click here to see
To view all translated materials including this page, select Country from the country navigator on the bottom of this page.


Beta inverse cumulative distribution function


x = betaincinv(y,z,w)
x = betaincinv(y,z,w,tail)


x = betaincinv(y,z,w) computes the inverse incomplete beta function for corresponding elements of y, z, and w, such that y = betainc(x,z,w). The elements of y must be in the closed interval [0,1], and those of z and w must be nonnegative. y, z, and w must all be real and the same size (or any of them can be scalar).

x = betaincinv(y,z,w,tail) specifies the tail of the incomplete beta function. Choices are 'lower' (the default) to use the integral from 0 to x, or 'upper' to use the integral from x to 1. These two choices are related as follows: betaincinv(y,z,w,'upper') = betaincinv(1-y,z,w,'lower'). When y is close to 0, the 'upper' option provides a way to compute x more accurately than by subtracting y from 1.

More About

collapse all

Inverse Incomplete Beta Function

The incomplete beta function is defined as


betaincinv computes the inverse of the incomplete beta function with respect to the integration limit x using Newton's method.

Extended Capabilities

See Also

| |