TABLE 5.
Rates of correct classification (ARCC) of environmental samples, based on known source locations, for different reductions in numbers of species classifications and drugs for three DA methods: results from cross-validation analysis using DA training rules from fecal samples
| Approach | % of isolates classified in agreement, best group for identificationa
|
||
|---|---|---|---|
| Linear | Quadratic | Epanechnikov | |
| Twelve drugs; eight species | 26.0, swine (39) | 18.7, swine (42) | 22.5, dairy cattle (39) |
| Reduced drugs; eight species | 25.4, swine (34) | 19.8, swine (37) | 17.1, dairy cattle (39) |
| Twelve drugs; six species | 37.9, ruminantsb (56) | 28.9, swine (50) | 31.0, ruminantsb (66) |
| Reduced drugs; six species | 36.9, ruminantsb (58) | 30.2, swine (50) | 30.0, swine (50) |
| Twelve drugs; five species | 40.2, livestockc (70) | 26.3, equine (29) | 33.6, livestockc (56) |
| Reduced drugs; five species | 39.8, livestockc (69) | 27.2, livestockc (31) | 30.4, equine (41) |
| Twelve drugs; four species | 57.2, food animalsd (85) | 32.7, food animalsd (36) | 43.1, food animalsd (57) |
| Reduced drugs; four species | 57.4, food animalsd (85) | 35.4, food animalsd (35) | 38.1, equine (41) |
a
The value in parentheses following the best group for identification is the percentage of isolates correctly identified in the group.
b
The ruminant group is a combination of beef and dairy cattle and sheep.
c
The livestock group is a combination of beef and dairy cattle, sheep, and swine.
d
The food animal group is a combination of beef and dairy cattle, sheep, swine, and poultry.