Returns the inverse of the cumulative distribution 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.
Syntax
BETAINV(probability,alpha,beta,A,B)
Probability is a probability associated with the beta distribution.
Alpha is a parameter of the distribution.
Beta is a parameter 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
- 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. BETAINV uses an iterative search technique. If the search has not converged 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 worksheet.
How?- Create a blank workbook or worksheet.
- Select the example in the Help topic. Do not select the row or column headers.
Selecting an example from Help
- Press CTRL+C.
- In the worksheet, select cell A1, and press CTRL+V.
- To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Tools menu, point to Formula Auditing, and then click Formula Auditing Mode.
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