Skip to main content

BETAINV

Definition

Returns the inverse of the cumulative beta probability density function for a specified beta distribution. That is, if probability = BETADIST(x,...), then BETAINV(probability,...) = x. The beta distribution can be used in project planning to model probable completion times given an expected completion time and variability.

Sample Usage

Syntax 

BETAINV(probability,alpha,beta,[A],[B]) 

The BETAINV function syntax has the following arguments:

  • Probability     Required. A probability associated with the beta distribution.

  • Alpha     Required. A parameter of the distribution.

  • Beta     Required. A parameter the distribution.

  • A     Optional. A lower bound to the interval of x.

  • B     Optional. An upper bound to the interval of x.

Remarks 

  • If any argument is nonnumeric, BETAINV returns the #VALUE! error value.

  • If alpha ≤ 0 or beta ≤ 0, BETAINV returns the #NUM! error value.

  • If probability ≤ 0 or probability > 1, BETAINV returns the #NUM! error value.

  • If you omit values for A and B, BETAINV uses the standard cumulative beta distribution, so that A = 0 and B = 1.

Given a value for probability, BETAINV seeks that value x such that BETADIST(x, alpha, beta, A, B) = probability. Thus, precision of BETAINV depends on precision of BETADIST.

In order to use the BETAINV formula, start with your edited Excellentable:

 

Then type in the BETAINV Formula in the area you would like to display the outcome:

 


By adding the values you would like to calculate the BETAINV formula for, Excellentable will generate the outcome:



A
B
1
Description
Data
2
Probability associated with the beta distribution
0.685470581
3
Parameter of the distribution
8
4
Parameter of the distribution
10
5
Lower bound
1
6
Upper bound
3
7
8
BETAINV
2.0


JavaScript errors detected

Please note, these errors can depend on your browser setup.

If this problem persists, please contact our support.