A loss group analysis enables you to combine two or more existing sets of loss or loss group analysis results into one set of results. During the analysis, Touchstone generates new annual exceedance probability (EP), summary EP, and average annual loss (AAL) values as well as a parent event set.

The analysis results to combine must:

• Exist on the same SQL Server instance
• Correspond to the same number of simulated years
• Correspond to the same model versions (if you combine loss results for the same model)
• Correspond to current model versions

Touchstone determines whether to include storm surge and demand surge based on the configuration of the analysis results to combine.