betaincinv - Beta inverse cumulative distribution function
Syntax
x = betaincinv(y,z,w)
x = betaincinv(y,a,tail)
Description
x = betaincinv(y,z,w) computes the inverse
incomplete beta function for corresponding elements of x, 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,a,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 from y from 1.
Definition
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.
See Also
betainc, beta, betaln
 | betainc | | betaln |  |
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