FIELDS IN DATA

Response variable
	prab		Presence-Absence data (0 = farm absent, 1 = farm present)

Predictor variables
Land-cover categories	
	dBarren		Barren land
	dCrop		Cropland
	dForest		Upland forest
	dGrass		Grassland
	dOpen		Open areas
	dPasture	Pasture
	dShrub		Shrubland or scrubland
	dUrban		Developed areas (high intensity)
	dWater		Water
	dWetland	Lowland areas 

Topography 	
	Slope		Slope (measured in degrees) 


Climate	
	Temp		Mean annual temperature (1950-2000)
	Precip		Mean annual precipitation (1950-2000)

Transportation	
	dRoads		Roads 

Covariates with prefix d are measured as linear distances (m) to the environmental or anthropogenic feature.

Note that only the linear forms of the predictor variables have been provided. The quadradtic forms of some variables were used to develop the probability surface described in the accompanying publication.