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Network Screening - EB Method

This documentation provides a step-by-step guide on accessing, configuring, running and reviewing, Network Screening (NWS) results.

1. Select Analysis Type​

Select Network Screening – Empirical Bayes Method under Analysis Type.

2. Overview​

  • The method has two tabs: Results and Errors .

  • When you first open Results , no data will be displayed.

  • Open the Settings and enable Editing to configure analysis parameters.

3. Settings​

  • Modify analysis settings if needed:

    • Update the title , years, months, or specific days for data.

    • Select involvement types like animal , bicycle , or pedestrian .

    • Specify initial impact type and road/weather conditions.

    • Adjust settings for window length , site prioritization weights , and safety measures (IRR) .

  • Save settings to enable analysis results.

4. Results​

  • Access the Results Tab after saving

  • you will see a data grid of all the locations inside of the site lists.

  • View metrics such as

    • Ranks

    • Excess and Observed Fatal and Injury

    • Predicted Fatal and Injury

    • Expected Fatal and Injury

    • Observed, Predicted, and Expected Totals.

5. Errors​

  • The Errors Tab identifies issues preventing accurate analysis.

  • Common errors include:

    • Missing AADTs or collisions for a location.

    • Missing Site Subtypes assigned to a location.

  • These errors will not block the analysis but may reduce accuracy.

  • Ensure all necessary data is provided to optimize results.

6. Map Tool​

  • Select locations and display their ranks visually on the map.

  • Use map tools to zoom in or inspect specific areas.

7. Map Display Options​

Click the Tile Icon beside the map to access display options

8. Map Display Options​

Choose one of the following:

  • Show Excess Rank : View locations ranked by excess collisions.

  • Show Expected Rank : View locations ranked by expected collisions.

9. Locations on the Map​

The map will display all analyzed locations with their corresponding ranks