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Table 1 Variation in estimated travel time compared to the true travel time for Arizona and New Hampshire.

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

Method OVERALL URBAN RURAL
  AVERAGE TIME
(min)
MAE1 RMSE2 AVERAGE TIME (min) MAE1 RMSE2 AVERAGE TIME (min) MAE1 RMSE2
ARIZONA
Actual Time 185    98.1    197.4   
Population Centroid 185.8 5.2 8.9 97.5 2.3 4.5 198.4 5.6 9.3
Geometric Centroid 201.4 21.1 34.4 99.3 3.5 7.1 215.9 23.6 36.7
Service area based on LandScan 187.8 5.4 13.2 98.5 2.1 3.4 200.6 5.8 14.1
Service area based on area 202.5 20.7 34.7 100.9 4.0 9.3 216.9 23.1 37.0
NEW HAMPSHIRE
Actual Time 41.1    12.6    42.6   
Population Centroid 40.7 2.3 12.0 12.6 1.5 4 42.2 2.4 12.5
Geometric Centroid 41.9 3.0 18.1 13.7 2.1 13.1 43.5 3.0 18.4
Service area based on LandScan 41.6 2.0 11.5 12.8 1.5 4.3 43.1 2.0 11.9
Service area based on area 43.3 3.1 27.8 14.4 2.5 14.2 44.9 3.1 28.5
  1. (1) MAE: Mean Absolute Error; (2) RMSE: Root mean square error