Table 2. Justification and equations for introduction, maintenance and domestic risk (all RFs have previously been multiplied by the presence-absence matrix)
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RFs used and equation |
Transformation |
Justification |
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Introduction Risk
(IR) |
RF1*RF2For
each count, for each species (no value for may 2007 due to RF1
calculus) |
None |
Each bird entering the community is associated with
a AIV risk related |
Maintenance Risk (MR) |
RF3+RF4+RF5+RF6+RF7For
each count, for each species |
Standardized |
Each RF is additive to the
others |
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Domestic Risk (DR) |
RF1+RF2+RF3+RF4+RF5+RF6+RF7For
each species observed simultaneously in waterfowl and domestic
compartment |
Standardized |
Each RF is additive to the other and
RF1 & 2 represent also a risk of introduction for the domestic
compartment |
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