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Table 3 Pairwise Correlation between MAE1 and RMSE2 and ZIP code area and population density 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

  Estimation Method
Error Measurement Method Geometric Centroid Population Centroid Service area based on LandScan Service area based on area
ARIZONA
MAE – area 0.535* 0.410* 0.417* 0.578*
RMSE – area 0.489* 0.221* 0.315* 0.330*
MAE – population density -0.357* -0.244* -0.271* -0.432*
RMSE – population density -0.207* -0.1143** -0.148* -0.196**
NEW HAMPSHIRE
MAE – area 0.552* 0.302* 0.274* 0.552*
RMSE – area 0.517* 0.173** 0.256* 0.476*
MAE – population density -0.202** -0.160** -0.189** -0.220**
RMSE – population density -0.136** -0.074 -0.104 -0.139**
  1. (1) MAE: Mean Absolute Error; (2) RMSE: Root mean square error
  2. * p < 0.001
  3. ** p < 0.05
  4. † NS