Returns the inverse of the cumulative beta probability density function. That is, if probability = BETADIST(x,...), then BETAINV(probability,...) = x. The cumulative beta distribution can be used in project planning to model probable completion times given an expected completion time and variability.
Syntax
BETAINV(probability,alpha,beta,A,B)
Probability is a probability associated with the beta distribution.
Alpha is a parameter to the distribution.
Beta is a parameter to the distribution.
A is an optional lower bound to the interval of x.
B is an optional upper bound to the interval of x.
Remarks
BETAINV uses an iterative technique for calculating the function. Given a probability value, BETAINV iterates until the result is accurate to within ±3x10-7. If BETAINV does not converge after 100 iterations, the function returns the #N/A error value.
Example
The example may be easier to understand if you copy it to a blank spreadsheet.
Selecting an example from Help
Data | Description |
---|---|
0.685470581 | Probability associated with the beta distribution |
8 | Parameter to the distribution |
10 | Parameter to the distribution |
1 | Lower bound |
3 | Upper bound |
Formula | Description (Result) |
=BETAINV(A2,A3,A4,A5,A6) | Inverse of the cumulative beta probability density function for the parameters above (2) |