Returns the gamma distribution. You can use this function to study variables that may have a skewed distribution. The gamma distribution is commonly used in queuing analysis.

Sample Usage

Syntax

GAMMADIST(x,alpha,beta,cumulative)

The GAMMADIST function syntax has the following arguments:

X Required. The value at which you want to evaluate the distribution.

Alpha Required. A parameter to the distribution.

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

Cumulative Required. A logical value that determines the form of the function. If cumulative is TRUE, GAMMADIST returns the cumulative distribution function; if FALSE, it returns the probability density function.

Remarks

If x, alpha, or beta is nonnumeric, GAMMADIST returns the #VALUE! error value.

If x < 0, GAMMADIST returns the #NUM! error value.

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

The equation for the gamma probability density function is:

The standard gamma probability density function is:

When alpha = 1, GAMMADIST returns the exponential distribution with:

For a positive integer n, when alpha = n/2, beta = 2, and cumulative = TRUE, GAMMADIST returns (1 - CHIDIST(x)) with n degrees of freedom.

When alpha is a positive integer, GAMMADIST is also known as the Erlang distribution.

In order to use the GAMMADIST formula, start with your edited Excellentable:

Then type in the GAMMADIST formula in the area you would like to display the outcome:

By adding the values you would like to calculate the GAMMADIST formula for, Excellentable will generate the outcome:

Error.

User does not have sufficient privileges to access this Content Learn More

JavaScript errors detected

Please note, these errors can depend on your browser setup.

If this problem persists, please contact our support.