The Tornado input options include:
Test range — Defines the range in which the tool samples the variables. The choices are either: the percentile range (if the tornado method is Percentiles of the variables) or the percent from the base case (if the tornado method is Deviations (by percentage)). The default is 10% to 90% for percentiles or -10% to 10% for deviations. You can select Custom to define a different range from those listed.
Test points — Defines how many values to test in the test range. The test points are evenly distributed across the test range. Testing more points than just end points better detects non-monotonic variable relationships and increases the accuracy of the elasticity calculation. The default is five test points.
Customize test ranges by variable — When checked, displays the Test Ranges dialog, which enables you to edit the test range minimum or maximum percentile or deviation for each selected input variable. To open this dialog for reiewing or editing values, click Test Ranges.
Base case for Crystal Ball variables — Indicates whether to define the base case as either the median values or existing cell values for Crystal Ball variables. If the tornado analysis includes simple precedent cells (that is, non-Crystal Ball variables), only Use existing cell values is available. The default is Use median values.