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# CDF inv

Evaluates the inverse of the Beta CDF.
Contents

C++
Excel

## CDF Inv

 doubleCDF_inv( double y double a double b )[inline]
Computes the inverse CDF of the Beta distribution. This is identical to the inverse regularized beta function.

The typical shape of this function is:
There is an error with your graph parameters for CDF_inv with options y=0:1 a=3 b=1:5:5 .size=medium

Error Message:Function CDF_inv failed. Ensure that: Invalid C++

Given y, this function finds x such that
`Beta::CDF( x, a, b ) = y`

The routine performs interval halving or Newton iterations to find the root of $\inline&space;&space;betaCDF(x,a,b)&space;-&space;y&space;=&space;0$

## References:

Cephes Math Library Release 2.8: June, 2000

### Parameters

 y a percentile in the range 0<=x<=1 a first shape parameter, a>0 b second shape parameter, b>0

the quantile

### Authors

Lucian Bentea (August 2005)
##### Source Code

Source code is available when you buy a Commercial licence.

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