Species analysis
Statistical exploration
Classification trees
Variables
Warbling Vireo
Occurred the most disproportionately in hexagons with more than 683
mm of annual precipitation and varied topography and less than 2%
ponderosa pine mixed conifer forest (Northeast Oregon). Where drier
climate (359-683 mm annual precipitation), it was most likely to occur
where May maximum temperature (hex. min.) is 10-17� C and there is
little or no true fir - mountain hemlock montane forest. In the driest
parts of its Oregon range (218-683 mm annual precipitation), it
occurred mostly in hexagons with more than 6 land cover types and/or
in relatively varied terrain. The logistic regression analysis showed
positive or negative weak association with topographic variation, the
extent of public land, April precipitation (hex. avg.), and April
precipitation (hex. max.).
Classification trees
Hexagons: using ONHP land cover classification (accuracy score: 89.53)
Squares: using ONHP land cover classification (accuracy score: 76.96)
Hexagons: using AVHRR land cover classification (accuracy score: 88.37)
