EXCEL GAMMA.INV FUNCTION

The inverse of the Gamma Cumulative Distribution is returned by the Excel Gamma.Inv function. Because the function is new in Excel 2010, it is not available in previous versions of Excel. The Gamma.Inv function, on the other hand, is merely a new version of the Gammainv function, which was accessible in prior versions of Excel.

Syntax :

=GAMMA.INV( probabilityalphabeta )

Parameters :

The following parameters are :

  • Probability – The probability value (between 0 and 1) for which the inverse of the Gamma Cumulative Distribution Function should be calculated.
  • Alpha – A distribution parameter.
  • Beta –  is a distribution parameter.
  • (It should be noted that if beta=0, this describes the inverse of the Standard Gamma Distribution.)

Step By Step Guide of GAMMA.INV Function

Example :

The graphs below depict the Gamma Cumulative Distribution and the Inverse Gamma Cumulative Distribution, with alpha = 3 and beta = 2. For a given probability, the Excel Gamma.Inv function may be used to determine the value of the Inverse Gamma Cumulative Distribution function. For example, for a probability of 0.5, the function is: =GAMMA.INV(0.5, 3, 2), yielding the value 5.348120627.

  • #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 64 iterations.
  • #VALUE!- This error occurs if any of the given parameters is not a number.

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