Table 1 |
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|
Variation in estimated travel time compared to the true travel time for Arizona and New Hampshire. |
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| Method |
OVERALL |
URBAN |
RURAL |
||||||
|
|
|||||||||
| AVERAGE TIME (min) |
MAE1 |
RMSE2 |
AVERAGE TIME (min) |
MAE1 |
RMSE2 |
AVERAGE TIME (min) |
MAE1 |
RMSE2 |
|
|
|
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| 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) MAE: Mean Absolute Error; (2) RMSE: Root mean square error |
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|
Berke and Shi International Journal of Health Geographics 2009 8:23 doi:10.1186/1476-072X-8-23 |
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