Table 3.
Absolute difference between observed transport time and estimates by subgroup.
| Linear arc | Google Maps | ArcGIS | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Mean Absolute Error (minutes) | SD | p-value | Mean Absolute Error (minutes) | SD | p-value | Mean Absolute Error (minutes) | SD | p-value | |
| Season | |||||||||
| Spring (March – May) | 4.8 | (8.4) | 0.90 | 3.5 | (5.6) | 0.76 | 4.3 | (6.0) | 0.72 |
| Summer (June – August) | 4.8 | (7.2) | 3.4 | (5.5) | 4.4 | (5.8) | |||
| Fall (September – November) | 4.8 | (6.7) | 3.5 | (5.3) | 4.4 | (5.6) | |||
| Winter (December – February) | 4.8 | (6.8) | 3.5 | (5.2) | 4.3 | (5.5) | |||
|
| |||||||||
| Time of day | |||||||||
| Morning (6-10am) | 4.9 | (6.9) | <0.01 | 3.5 | (5.2) | <0.01 | 4.5 | (5.5) | <0.01 |
| Mid-day (10am-3pm) | 5.1 | (7.4) | 3.7 | (5.6) | 4.8 | (5.9) | |||
| Afternoon (3pm-8pm) | 5.0 | (7.1) | 3.7 | (5.6) | 4.8 | (5.9) | |||
| Nighttime (8pm-6am) | 4.4 | (7.7) | 3.1 | (5.1) | 3.5 | (5.5) | |||
|
| |||||||||
| ZIP Code Population density | |||||||||
| 90 to 100th percentile | 3.9 | (6.2) | <0.01 | 3.1 | (5.0) | <0.01 | 4.2 | (5.3) | <0.01 |
| 80 to 89th percentile | 4.9 | (7.8) | 3.5 | (5.0) | 4.0 | (5.4) | |||
| 70 to 79th percentile | 9.9 | (10.2) | 5.8 | (8.1) | 6.2 | (8.5) | |||
| Less than 70th percentile | 9.1 | (8.6) | 5.1 | (6.4) | 6.3 | (6.7) | |||
|
| |||||||||
| Region | |||||||||
| King County, Washington | 4.8 | (7.3) | 0.42 | 3.5 | (5.3) | <0.01 | 4.4 | (5.7) | 0.62 |
| Southwestern Pennsylvania | 4.6 | (8.6) | 4.2 | (6.7) | 4.3 | (7.3) | |||
SD, standard deviation