GAMMA.INV function

Returns the inverse of the gamma cumulative distribution. If p = GAMMA.DIST(x,...), then GAMMA.INV(p,...) = x.

You can use this function to study a variable whose distribution may be skewed.

Syntax

GAMMA.INV(probability,alpha,beta)

The GAMMA.INV function syntax has the following arguments:

  • Probability     Required. The probability associated with the gamma distribution.

  • Alpha     Required. A parameter to the distribution.

  • Beta     Required. A parameter to the distribution. If beta = 1, GAMMA.INV returns the standard gamma distribution.

Remarks

  • If any argument is text, GAMMA.INV returns the #VALUE! error value.

  • If probability < 0 or probability > 1, GAMMA.INV returns the #NUM! error value.

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

Given a value for probability, GAMMA.INV seeks that value x such that GAMMA.DIST(x, alpha, beta, TRUE) = probability. Thus, precision of GAMMA.INV depends on precision of GAMMA.DIST. GAMMA.INV uses an iterative search technique. If the search has not converged after 64 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 do I copy an example?

  1. Select the example in this article.

    Important   Do not select the row or column headers.

    selecting an example from help

    Selecting an example from Help

  2. Press CTRL+C.

  3. In Excel, create a blank workbook or worksheet.

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

    Important   For the example to work properly, you must paste it into cell A1 of the worksheet.

  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.

After you copy the example to a blank worksheet, you can adapt it to suit your needs.

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Data

Description

0.068094

Probability associated with the gamma distribution

9

Alpha parameter to the distribution

2

Beta parameter to the distribution

Formula

Description (Result)

=GAMMA.INV(A2,A3,A4)

Inverse of the gamma cumulative distribution for the above terms (10.00001131)

Applies To: Excel 2010, Excel Starter, Excel Online, SharePoint Online



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