Define Group
The Define button group includes all of the functions for building a full model, including the tools to define inputs using both @RISK functions representing standard probability distributions, tools to fit a distribution to existing data, and create time series and correlations.

What-If Analysis
Evaluate the impact of varying input values on key outputs in a spreadsheet model.

Distribution
Add or edit probability distributions in the formula for the currently selected cell.

Output
Add the currently selected cell or range of cells as a simulation output.

Fit
Fits a distribution to a set of data.

Time Series
Add or edit a time series model.

Correlation
Defines correlations (or copulas) for probability distributions or related input variables.

Function
Inserts an @RISK function in the selected cell.

Model
Displays a list of the current output cells along with all distribution functions entered in the worksheet.