### Transform > Probability Distributions > F

Calculates the probability densities, cumulative probabilities, and inverse cumulative probabilities for an F distribution.

The F distribution is a sampling distribution of two independent random variables with chi-square distributions, each divided by its degrees of freedom. It is most commonly used in test of variance. 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.

•Statistics:

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.

•Deg Freedom 1: Enter the degrees of freedom for the numerator.

•Deg Freedom 2: Enter the degrees of freedom for the denominator.

### Example

Example of using the probability density function (pdf)

Probability Distributions

Web Resource: Weisstein, Eric W., Wolfram MathWorld. | Wikipedia