Configuring and running a marginal impact analysis

A marginal impact analysis enables you to view the effect that a specific loss results set (the target, or new portfolio) has on another loss results set (the reference, or base, portfolio).

You choose two sets of detailed loss analysis or loss group analysis results for the analysis:

  • One set of analysis results serves as the reference, or base, portfolio.
  • A target set of analysis results serves as the new, or reference, portfolio.

During the analysis, Touchstone combines the results of the target analysis with the reference, base, set of analysis results.

Procedure

  1. Generate detailed loss analysis or loss group analysis results, for example, by running two detailed loss analyses, in any order.
    You do not have to run the analyses with the same settings. You can run these analyses in one or more projects. That is, you can run a marginal impact analysis using loss results from multiple projects.
  2. In the navigation pane, open the Results grid.
  3. Open the target analysis results (detailed loss analysis or loss group).
  4. In the results grid, under Run Analysis, select Marginal Impact.
    The Marginal Impact Analysis pane opens.
  5. In the Marginal Impact Diagnostics pane, select Select Base Loss Result and then:
    1. Select or clear Exclude contracts based on Expiring Contract ID.
      If you select the check box, Touchstone will remove losses for these contracts from the reference portfolio. You can add or modify existing contract names in the text box.
    2. [Optional] Specify a Window value to generate averaged EP (exceedance probability) loss results.
      The default is "0", meaning that Marginal Impact will not average the EP losses.
    3. Highlight the reference analysis results (the base loss results) that you want to combine with the target analysis results set that you selected.
      This set of reference analysis results will appear as the "Reference Portfolio" in the Marginal Impact Results table.
  6. In the Marginal Impact Diagnostics pane, select Configure Groups.
  7. In the Configure Groups pane, select an existing template or define a combination of target settings to use in the analysis (you can then save the template as described in step 8):
    • In the Template field, select a saved template. The template includes target name, administrative boundaries (optional), and perils. You can also select sub-perils.
    • Or, click to add a new combination of target name, administrative boundaries (optional), and perils. To create a new administrative boundary, click , which opens the Admin Boundaries Manager in the Administration Console, and then create an admin boundary. You can also select sub-perils.
  8. [Optional] If you defined a new combination of target settings, save as a template for later use in marginal impact analyses.
    1. Click Save as a Template.
    2. Enter a unique template name.
    3. Click Save Template.
  9. In the Perils column, click and select the perils and sub-perils to include.
  10. Select Analysis Management to configure analysis-specific functions.
  11. In the Analysis Name field, leave the default name or enter a unique, alphanumeric identifier.
    Entering some combination of the exposure view name along with the analysis type enables you to find result sets quickly in the Activity Monitor.
  12. Click Run.
    Touchstone adds the analysis to the Activity Monitor queue for processing when the required system resources are available. The analysis type in the Activity Monitor is "Impact Analysis," while it is "Marginal and portfolio impact analysis" in the results grid
  13. To view the analysis results, make sure the activity status is "Completed" in the Activity Monitor, highlight the activity, and then click (View Analysis Result).
    You can also click the hyperlinked name of the marginal impact analysis in the results grid.