Gamma Distribution

Transform > Probability Distributions > Gamma


Calculates the probability densities, cumulative probabilities, and inverse cumulative probabilities for a gamma distribution.

The gamma distribution is often used to model positively skewed data. Use when random variables are greater than 0.



Dialog box items

Source Column:
Enter the column you want to evaluate.

Target Column:
Enter a storage column for the generated values. Leave blank to have VisualStat automatically name the target column.

Choose from the following options:

oProbability density: Choose to calculate the probability densities.

oCumulative probability: Choose to compute the cumulative probabilities.

oInverse cumulative probability: Choose to compute the inverse of the cumulative probabilities.

Distribution: Select the distribution for the variable.

Alpha: Enter a alpha shape parameter to define the gamma distribution

Beta: Enter a beta scale parameter to define the gamma distribution



Example of using the probability density function (pdf)




See Also:

Probability Distributions

Web Resource: NIST e-Handbook of Statistical Methods, 2006 | Weisstein, Eric W., Wolfram MathWorld. | Wikipedia