The Specify Options panel of the Tornado Chart tool sets options that control the tool. The groups of options in this panel are described in the following sections:
Other controls are:
Back — Returns to the Specify Input Variables panel.
Start — Starts the tool, generating the tornado and spider charts.
The Tornado Method options in this panel are:
Percentiles Of The Variables — Indicates that the tool should test the variables using percentiles of the assumption distributions or percentiles of the decision variable ranges. This is the default.
Percentage Deviations From The Base Case — Indicates that the tool should test the variables using small changes that are specified percentages away from the base case. This is the only option available if you selected variables other than assumptions or decision variables. The tool treats discrete decision variables as continuous for this second method.
The Tornado Input options include:
Testing 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 Percentage Deviations From The Base Case). The default is 10% to 90% percentiles or -10% to 10% deviation.
Testing Points — Defines how many values to test in the testing range. The testing points are evenly distributed across the testing range. Testing more points than just end points detects non-monotonic variable relationships. The default is five testing points.
For Base Case Specifies whether to define the base case as either the existing cell values or the median values of the variables. If the tornado is based on a percentage deviation, only the cell values option is available. The default is the median cell values.
The Tornado Output options are:
Tornado Chart — Generates a tornado chart showing the sensitivity of the variables using range bars.
Spider Chart — Generates a spider chart showing the sensitivity of the variables using sloping curves.
Show Top Variables — Indicates how many variables to include in the tornado charts if there are a lot of variables. The charts can only clearly show about 20 variables.