Viewing the societal risk results for day, night, and the whole year

The FN Curve presents an overview of the societal risk results in a way that makes it easy to compare the level of risk for day and for night separately, and to see the weighted average of the risk levels for the entire year, i.e. for day and night combined.

Setting values for the Combination Factors

Before you view these risk results, you must make sure that appropriate values are set for the weighting factors for combining the results for the two run rows. For this tutorial, the following factors will be used:

•Day: 0.4

•Night: 0.6

When you move to the Combinations Supertab, you will see that there is a single Combination defined, with the name

Combination 1.

In Safeti the factors will initially be set 1 for Day and 0 for Night, and you must change them to the values given above. When you create a new Safeti workspace, it will have one Combination defined, with a factor of 1 for the initial single Run Row, and

when you use the Add button in the Run row grid to add a new Run Row, that Run Row is created with a factor of 0.

In Safeti Lite, the new workspace is created with the factors of 0.4 and 0.6 already set for the two Run Rows, so you will not need to change the factors for this tutorial.

The name Combination 1 is not informative, and you will change the name for this tutorial to 40% Day. To rename the Combination, double-click on the name in the column header. The text will become selected for editing, and you can type the new name.

When you have completed these settings, the Combinations

Supertab should appear as shown.

Viewing the FN Curve

Select Smoothed FN from the Risk gallery in the Home tab of the Ribbon Bar. In the Wizard dialog, select both Run Rows and the Combination, as shown, and then click on Finish.