BETADIST function

Returns the cumulative beta probability density function. The beta distribution is commonly used to study variation in the percentage of something across samples, such as the fraction of the day people spend watching television.

Syntax

BETADIST(x,alpha,beta,A,B)

X     is the value between A and B at which to evaluate the function.

Alpha     is a parameter of the distribution.

Beta     is a parameter of 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, BETADIST returns the #VALUE! error value.

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

  • If x < A, x > B, or A = B, BETADIST returns the #NUM! error value.

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

Example

The example may be easier to understand if you copy it to a blank worksheet.

How to copy an example

  1. Create a blank workbook or worksheet.

  2. Select the example in the Help topic.

    Note   Do not select the row or column headers.

    Selecting an example from Help

    Selecting an example from Help

  3. Press CTRL+C.

  4. In the worksheet, select cell A1, and press CTRL+V.

  5. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.

1

2

3

4

5

6

A

B

Data

Description

2

Value at which to evaluate the function

8

Parameter of the distribution

10

Parameter of the distribution

1

Lower bound

3

Upper bound

Formula

Description (Result)

=BETADIST(A2,A3,A4,A5,A6)

Cumulative beta probability density function, for the above parameters (0.685470581)

Applies To: Excel 2007



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