How to Develop a Tornado Graph

To develop a tornado graph, we complete the following steps:

• Make sure that each uncertainty is set to its base value (p50). Input each uncertainty’s p10 and p90, one at a time, into our deterministic model and record the resulting measure of value (usually we use NPV as our measure of value for the tornado graph).

• In a similar fashion, input each discrete variable as success and failure, one at a time, into the deterministic model and record the result.

• Compute the absolute value of the difference between the p90 and p10 resulting measure of value for each uncertainty.

• Compute the absolute value of the difference between the success and fail cases for each discrete variable.

• Rank the differences from ...

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