@RISK: Specifying Distributions in Terms of Percentiles

@RISK lets you define distributions using percentiles. Percentiles are internally converted to standard parameters for each simulation iteration.

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Applies to: @RISK 5.x and Up

Distributions with Percentiles

Answer:
In the Define Distributions dialog, use the Alt. Parameters tab.

You can specify one or more percentiles (e.g., 10th and 90th) instead of standard parameters like mean or mode.
Use the drop-down next to Alternate to choose which percentiles to apply, or mix percentiles with standard parameters.

Internally, @RISK converts these percentile-based specifications into standard distribution parameters during each simulation iteration.

This ensures the correct distribution is used even if parameters change between iterations. For complex distributions, @RISK applies efficient proprietary algorithms to resolve percentiles quickly.

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