HomeTechniques and Tips@RISK Simulation: Numerical ResultsHow Many Times Did an Event Occur?

6.20. How Many Times Did an Event Occur?

Applies to: @RISK 6.x/7.x

We have a combined risk register that models the risks based on Monte Carlo sampling. I would like to get a table that shows how many times risk one, risk two, risks one and three, or risks one-two-three occurred.

This is a special case of a more general problem: in how many iterations did a given event or combination of events occur? Or, instead of how many iterations, you might want to know in what percentage of iterations some event occurred.

The basic technique is to construct a cell formula that is 1 when a desired event occurs and 0 when it doesn't. Constructing that formula is not hard if you know these rules:

An example is attached to this article. It uses part of a sheet from our standard Risk Register example, in rows 1 to 9. The green box tracks seven events, showing how to compute the percentage of iterations where each event occurred, as well as the number of iterations where each event occurred.

Last edited: 2017-03-30

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