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EXCEL GAMMAINV FUNCTION
Excel GAMMAINV Function Introduction
The inverse of the Gamma Cumulative Distribution is returned by the Excel Gammainv function.
Description of Excel GAMMAINV Function
Syntax :
=GAMMAINV( probability, alpha, beta )
Parameters :
The following parameters are :
- Probability– The probability value for which the inverse Gamma Cumulative Distribution Function should be evaluated (must be between 0 & 1).
- Alpha – A The distribution’s parameter.
- Beta – A The distribution’ parameter.
- (Note: If beta=0, the Standard Gamma Distribution is used.)
Step By Step Guide of GAMMAINV Function
Example
The graphs below depict the Gamma Cumulative Distribution and the Inverse Gamma Cumulative Distribution, with alpha set to 3 and beta set to 2. If you wish to determine the value of the Inverse Gamma Cumulative Distribution with the probability 0.5, use the Excel Gammainv function, as shown below:
= GAMMAINV ( 0.5, 3, 2 )
This yields the value 5.348120627.
Key Points
- #NUM! – Occurs if any of the following conditions are met: the supplied probability value is 0 or 1; the supplied alpha is 0 or the supplied beta is 0.
- #N/A – Occurs when Excel fails to find a solution after 100 iterations. The answer cannot be calculated using Excel.
- #VALUE! – This error occurs if any of the given parameters is not a number.
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