// Home / Documentation / Function Reference / NTGAMMADISTINV

Returns the inverse of the cumulative distribution function for a specified gamma distribution.

## Syntax

• prob,
• Alpha,
• Beta

)

#### Parameters

• prob is a probability corresponding to the normal distribution $(0
• Alpha is a parameter of the distribution [latex]\alpha\;(>0)$
• .
• Beta is a parameter of the distribution $\beta\;(>0)$.

## 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

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 Tools menu, point to Formula Auditing, and then click Formula Auditing Mode.

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A B
Data Description
0.5 Probability associated with the gamma distribution
4 Value of parameter Alpha
2.3 Value of parameter Beta
Formula Description (Result)
=NTGAMMADISTINV(A2,A3,A4) Inverse of the cumulative distribution function for the terms above