### Transform > Probability Distributions > Poisson

Calculates probabilities, cumulative probabilities, and inverse cumulative probabilities for a Poisson distribution.

The Poisson distribution is often used when the probability of an event is small.

### 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.

•Mean: Enter the mean value you want to use as the center point for the normal distribution.

### Example

Example of using the probability density function (pdf)

Probability Distributions

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