Table 2.

Summary of Chelsea and Boston Spatial Factor Models^a

	Chelsea (adj. R2 = 0.09) (n = 513 976)b		Boston (adj. R2 = 0.06) (n = 224 129)b
variable	β coefficient	std. error	β coefficient	std. error
(intercept)	0.580	0.003	0.671	0.004
distance from road classes 1–4 (per km)	−0.458	0.008	−0.813	0.052
distance from bus routes (per km)	n/a	n/a	−1.011	0.016
distance from US-1 (elevated section; per km)	−0.167	0.001	n/a	n/a
near US-1 (<200 m; binary)	0.080	0.002	n/a	n/a
near interstate (<400 m; binary)	n/a	n/a	0.077	0.005
near interstate (<100 m; binary)	n/a	n/a	0.142	0.008
distance from open spaces (any size; per km)	n/a	n/a	0.278	0.014
distance from open spaces (>5000 m2; per km)	0.430	0.009	n/a	n/a
distance from residential land use (per km)	0.558	0.015	0.787	0.003
distance from transportation land use (per km)	n/a	n/a	−0.211	0.008
near major-road intersection (<150 m; binary)	0.081	0.002	n/a	n/a

^aModels predict ln(SF), where SF is the unitless spatial factor. Variables are significant at p < 0.05.

^bNumber of 1-sec data points used to build the model.