Chapter 13 Hazard Risk Weights Collection

The Hazard Risk Weights Collection represents the expert elicited risk weights for places (feedgrounds, baiting stations, etc.), objects (mineral licks, water bodies, etc.) or events (carcass movement, taxidermy, processing, shed hunting etc.) that may exist or occur on the landscape. Default risk weights are saved for the Pacific Northwest and Arid Southwest regions, however the user can create risk weights for any other region.

13.1 Understanding and using the Hazard Risk Weights Collection

Distinctions may exist in weights between regions, but experts also recognize that weightings may differ by proximity to known infections. For that reason, the Hazard Risk Weights Collection contains two scenarios for each region: (1) weights for a closer scenario, and (2) weights for a farther scenario.

13.1.1 The Definition of the Weights

The weights represent the expert-elicited estimate of the number of introductions and subsequent transmission events that would arise over five years from each risk factor in a jurisdiction containing a static population of 1,000 hosts.

13.1.2 Closer Scenario

The closer scenario occurs whenever the nearest CWD detection was within the average range that local, free-ranging cervid typically travels within a single year. When CWD infection is very near, the weights of the risk factors take on the near values.

13.1.3 Farther Scenario

The farther scenario occurs whenever the nearest CWD detection was beyond the average range that local, free-ranging cervid typically travels within a single year. When CWD infection is far away, the weights of the risk factors take on the far values.

13.2 Weightings

13.2.1 Mean Values

The mean value represents the average weight estimated by experts for the risk factor in the corresponding scenario and region. The default mean value in the Pacific Northwest region was estimated by 7 experts, while the mean value in the Arid Southwest region was estimated by 8 experts.

13.2.2 Standard Deviations

The standard deviation value represents the spread around the average weight estimated by experts for the risk factor in the corresponding scenario and region. The default standard value in the Pacific Northwest region was estimated by 7 experts, while the mean value in the Arid Southwest region was estimated by 8 experts.

13.2.3 Customizable Entries

We recognize that the default weightings for the Arid Southwest or Pacific Northwest may not be be appropriate in your jurisdiction. Thus, the Warehouse allows you to adjust the weights to better reflect the distribution of risk in your area.

13.3 Visualizations that can use the Hazard Risk Weights Collection

  • Provider Ad hoc

13.4 Properties

An asterisk (*) denotes a required field.

Field name Definition Allowed values
Name* The name of the weight data set any plain text string containing numbers, letters, and/or symbols
Template The template of weights used Null, Arid Southwest, Pacific Northwest
Closer
Mean* The average value of the weight for that risk factor in the closer scenario decimal number greater than or equal to zero
Std deviation* The standard deviation of the weight for that risk factor in the closer scenario decimal number greater than or equal to zero
Farther
Mean* The average value of the weight for that risk factor in the farther scenario decimal number greater than or equal to zero
Std deviation* The standard deviation of the weight for that risk factor in the farther scenario decimal number greater than or equal to zero