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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