Table 4.
Spearman rank correlations between measures of the accessibility of hospitals by aggregation method
| Accessibility measures using shortest network distance | Accessibility measures using shortest network time | ||||||
| Hospitals | CTCa | WDAb | WBlc | CTCa | WDAb | WBlc | |
| Minimum network distance | CTCa | 1.000 | 1.000 | ||||
| WDAb | 0.991 | 1.000 | 0.987 | 1.000 | 0.997 | ||
| WBlc | 0.989 | 0.997 | 1.000 | 0.984 | 0.997 | 1.000 | |
| Average distance to three closest services | CTCa | 1.000 | 1.000 | ||||
| WDAb | 0.997 | 1.000 | 0.995 | 1.000 | |||
| WBlc | 0.997 | 0.999 | 1.000 | 0.994 | 0.999 | 1.000 | |
| Average distance to five closest services | CTCa | 1.000 | 1.000 | ||||
| WDAb | 0.998 | 1.000 | 0.996 | 1.000 | |||
| WBlc | 0.998 | 0.999 | 1.000 | 0.995 | 0.999 | 1.000 | |
| Average distance to all services | CTCa | 1.000 | 1.000 | ||||
| WDAb | 0.998 | 1.000 | 0.995 | 1.000 | |||
| WBlc | 0.999 | 0.999 | 1.000 | 0.995 | 0.998 | 1.000 | |
| Number of services within 500 metres | CTCa | 1.000 | 1.000 | ||||
| WDAb | 0.604 | 1.000 | 0.993 | 1.000 | |||
| WBlc | 0.588 | 0.838 | 1.000 | 0.992 | 0.999 | 1.000 | |
| Number of services within 1000 metres | CTCa | 1.000 | 1.000 | ||||
| WDAb | 0.828 | 1.000 | 0.990 | 1.000 | |||
| WBlc | 0.776 | 0.924 | 1.000 | 0.990 | 0.998 | 1.000 | |
| Number of services within 2000 metres | CTCa | 1.000 | 1.000 | ||||
| WDAb | 0.916 | 1.000 | 0.978 | 1.000 | |||
| WBlc | 0.898 | 0.968 | 1.000 | 0.976 | 0.996 | 1.000 | |
| Gravity model with α = 1 | CTCa | 1.000 | 1.000 | ||||
| WDAb | 0.994 | 1.000 | 0.992 | 1.000 | |||
| WBlc | 0.993 | 0.998 | 1.000 | 0.990 | 0.997 | 1.000 | |
| Gravity model with α = 1.5 | CTCa | 1.000 | 1.000 | ||||
| WDAb | 0.993 | 1.000 | 0.990 | 1.000 | |||
| WBlc | 0.992 | 0.996 | 1.000 | 0.988 | 0.996 | 1.000 | |
| Gravity model with α = 2 | CTCa | 1.000 | 1.000 | ||||
| WDAb | 0.991 | 1.000 | 0.987 | 1.000 | |||
| WBlc | 0.991 | 0.995 | 1.000 | 0.986 | 0.994 | 1.000 | |
a Aggregation method based on census tract centroid (the least accurate method).
b Aggregation method based on the population-weighted mean of the accessibility measure for dissemination areas within census tracts.
c Aggregation method based on the population-weighted mean of the accessibility measure for blocks within census tracts (the most accurate method).