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Table 1 Evaluation of agreement between residential density calculations and actual residential density determined by e911 data

From: Smart density: a more accurate method of measuring rural residential density for health-related research

Residential Density Calculation R-squared# MSE@ Slope# (95% CI) Intercept# (95% CI)
Census Geography       
   Census tract 0.63 0.32 0.49 (0.45, 0.53) 0.59 (0.46, 0.71)
   Census block group 0.66 0.29 0.44 (0.41, 0.48) 0.36 (0.26, 0.46)
   Census block 0.61 0.34 0.41 (0.38, 0.45) 0.04 (-0.05, 0.13)
GIS-refined Measure       
   1-km circle buffer 0.89 0.09 0.59 (0.57, 0.61) 0.21 (0.17, 0.26)
   1-km circle and road network buffer 0.90 0.08 0.75 (0.73, 0.78) -0.11 (-0.11, -0.07)
  1. #R-squared, slope, and intercept are from models in which both the calculated residential density and e911 residential density are transformed to the log scale.
  2. @MSE is the variance estimate for the difference between calculated residential densities and e911 residential density; it reflects both model error and lack of fit from the identity line as illustrated in Figure 1.