Species analysis
Statistical exploration
Classification trees
Variables
Bank Swallow
Occurred the most disproportionately in hexagons with either (a)
annual precipitation less than 303 mm and May minimum temperature
(hex. min.) of 3-7� C, or (b) annual precipitation of 303-431 mm and
more than 11% agricultural lands. Somewhat less likely to occur in
wetter areas (annual precipitation more than 431 mm), if more than
13% ponderosa pine mixed conifer forest (Northeast Oregon) or if the
largest cover type occupies less than 51% of a hexagon. The logistic
regression analysis showed positive or negative association with
agricultural lands, Douglas-fir - w. hemlock - red cedar forest, May
precipitation (hex. avg.), topographic variation, the extent of public
land, and-to a lesser degree-May maximum temperature (hex.
max.), June maximum temperature (hex. avg.), and the extent of public
land.
Classification trees
Hexagons: using ONHP land cover classification (accuracy score: 81.86)
Squares: using ONHP land cover classification (accuracy score: 92.45)
Hexagons: using AVHRR land cover classification (accuracy score: 83.02)
