Alternative risk-scaling method for introMCDA
1 Introduction
2 Scaling functions
Figure 2.1: Transboundary. Current (grey) and proposed (orange) scaling functions for the risk of introduction. The current 4-level scale is transposed to the 0-100 interval for comparability.
Figure 2.2: International animal mobility. Current (grey) and proposed (orange) scaling functions for the risk of introduction. The current 4-level scale is transposed to the 0-100 interval for comparability.
Figure 2.3: Accessibility. Current (grey) and proposed (orange) scaling functions for the risk of introduction. The current 4-level scale is transposed to the 0-100 interval for comparability.
Figure 2.4: Entry points. Current (left) and proposed (right) scaling functions for the risk of introduction. The current 4-level scale is transposed to the 0-100 interval for comparability.
3 Final risk map
Figure 3.1: Final introduction risk maps using current (left) and proposed (right) scaling functions.
Figure 3.2: Final introduction risk values. Proposed vs current.
Figure 3.3: Final introduction risk classes, after categorisation of the proposed risk values by quantiles.
4 Conclusions
The proposed methodology is a smoother extension of the current one, yielding consistent values but more nuanced.
Classification of the introduction risk afterwards yields identical categories for most 95% epidemiological units, but not all. A few of them were categorised in the class immediately below using the proposed method.
The user gains finer control on the scaling functions (type and parameters).
The proposed method requires deeper understanding of the scaling concept, but simplifies the operational steps.