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EXCEL GAMMADIST FUNCTION
Excel GAMMADIST Function Introduction
The Gammadist function in Excel returns the Gamma Distribution, which is commonly used to calculate probability for variables with a skewed distribution, such as queuing analysis. The user can choose whether to calculate the cumulative distribution or the probability density function.
Description of Excel GAMMADIST Function
Syntax :
=GAMMADIST( x, alpha, beta, cumulative )
Parameters :
The following parameters are :
- X – The value at which the function should be evaluated (must be 0).
- Alpha – A distribution parameter.
- Beta – is a distribution parameter.
- (Note that if beta=0, the Standard Gamma distribution is computed.)
- Cumulative – A logical argument indicating the kind of gamma distribution to be computed. This can be TRUE or FALSE, indicating:
- TRUE: Determine the cumulative distribution function;
- FALSE: Determine the probability density function.
Step By Step Guide of GAMMADIST Function
Example :
The probability density function for the gamma distribution with = 3 and = 2 is shown in the graphic on the right. If you wish to determine the value of this function at x = 6, use the Excel Gammadist function, as shown below:
=GAMMADIST ( 6, 3, 2, FALSE )
Key Points
- #NUM! – Occurs if any of the following conditions are met: the supplied value of x is 0; the supplied value of alpha is 0; or the supplied value of beta is 0.
- #VALUE! – This error occurs if any of the provided parameters, x, alpha, or beta, are non-numeric; if the supplied value of cumulative is not recognised as a logical or numeric value.
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