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Tornado chart

A tornado chart ranks the importance of the simulation inputs (parameters) on a specified output (at a specified timepoint). The rank coefficient for each input is represented by a horizontal bar with a value between -1 and 1, ordered from highest to lowest contribution to the output variability.

The tornado chart is a tool in sensitivity analysis and can only be created after a probabilistic simulation or a sensitivity analysis has been performed.

Tornado charts can help you:

  • Find which parameters affect a specific simulation output the most (and the least).
  • Illustrate correlations between parameters as set up in the parameter correlation settings.

Creating a tornado chart

From the results window (Recommended)

  • Right-click an output that you wish to plot and select Tornado Chart from the popup-menu.

From the charts window

  • Right-click the charts window and select Create | Tornado Chart from the popup-menu.

Editing a tornado chart

Some properties can be changed directly by using the controls below the chart. For a tornado chart there are controls for:

  • Legend - Toggle legend on/off
  • Correlation - Select ranking method (more information can be found below).
  • Time-point - Select time point for the output.

To change other properties either right-click the chart in the charts window and select Edit, or double-click the chart, or click the Edit button in the title bar.

The chart editor has two tabs:


This screen let you edit properties such as name and axes, that are common to most charts. Please see editing chart properties for more information.


  • Output - Select the target output.
  • Inputs - Select the inputs you are interested in. By default all parameters that are included in the probabilistic/sensitivity analysis are selected.
  • Timepoint – For time dependent outputs, specify the time point you wish to plot.
  • Max number of bins – Limits the number of inputs that are shown in the chart. Default=10.
  • Type – Select which correlation ranking method you wish to use.
    • Spearman’s rank correlation coefficient
    • Pearson product-moment correlation coefficient
    • Standardized regression coefficient
    • Standardized rank regression coefficient
    • Partial correlation coefficient
    • Partial rank correlation coefficient

See also

tornado_chart.txt · Last modified: 2019/11/18 13:34 (external edit)