A number of sites with presence or absence of the short-finned eel (Anguilla australis) in New Zealand, and environmental data at these sites; and gridded data of the environmental variables for the study area.
| type | variable name | values | mean and range |
| Reach | LocSed | weighted average of proportional cover of bed sediment | 1=mud, 2=sand, 3=fine gravel; 4=coarse gravel; 5=cobble; 6=boulder; 7=bedrock; 3.77, 1 to 7 |
| Segment | SegSumT | Summer air temperature (degrees C) | 16.3, 8.9 to 19.8 |
| SegTSeas | Winter air temperature (degrees C), normalised with respect to SegJanT | 0.36, -4.2 to 4.1 | |
| SegLowFlow | segment low flow (m3/sec), fourth root transformed | 1.092, 1.0 to 4.09 | |
| Downstream | DSDist | distance to coast (km) | 74, 0.03 to 433.4 |
| DSDam | presence of known downstream obstructions, mostly dams | 0.18, 0 or 1 | |
| DSMaxSlope | maximum downstream slope (degrees) | 3.1, 0 to 29.7 | |
| Upstream / catchment | USAvgT | average temperature in catchment (deg C) compared to segment, normalised with respect to SegJanT | -0.38, -7.7 to 2.2 |
| USRainDays | days/month with rain greater than 25 mm | 1.22, 0.21 to 3.30 | |
| USSlope | average slope in the upstream catchment (degrees) | 14.3, 0 to 41.0 | |
| USNative | area with indigenous forest (proportion) | 0.57, 0 to 1 | |
| Fishing method | fishing method in five classes: electric, net, spot, trap & mixture | NA |
data(Anguilla_train)
data(Anguilla_test)
data(Anguilla_grids)John R. Leathwick and Jane Elith
Elith, J., J.R. Leathwick and T. Hastie, 2009. A working guide to boosted regression trees. Journal of Animal Ecology 77: 802-81