### Transform > Probability Distributions > Exponential

Calculates probabilities, cumulative probabilities, and inverse cumulative probabilities for an Exponential distribution.

The probability density function of the exponential distribution is given by the formula: f(x:lambda) = lamba*exp(-lambda*x) where lambda > 0 is often called the rate parameter.

### 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.

•Lambda: Sets the rate parameter lambda

### Example

Example of using the probability density function (pdf)

Probability Distributions

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