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Table 2 Pairwise correlations comparing actual travel times to four estimation methods, for urban and rural areas of Arizona (AZ) and New Hampshire (NH).

From: Computing travel time when the exact address is unknown: a comparison of point and polygon ZIP code approximation methods

  Estimation Method
Location of actual travel time Geometric Centroid Population Centroid Service area based on LandScan Service area based on area
AZ Urban 0.957* 0.994* 0.991* 0.957*
AZ Rural 0.988* 0.995* 0.997** 0.980*
NH Urban 0.920** 0.966 0.967 0.933*
NH Rural 0.988* 0.991* 0.992* 0.986*
  1. * p < 0.001
  2. ** p < 0.05
  3. † NS