Table 2 Characteristics of measures applying gravity model developments
Variables | Total | Base gravity model | 2SFCA method family | Kernel density method |
|---|---|---|---|---|
Case numbers | 346 | 14 | 324 | 8 |
Study area | ||||
Africa | 4 (1%) | 0 (0%) | 4 (1%) | 0 (0%) |
Asia | 160 (46%) | 10 (71%) | 148 (46%) | 2 (25%) |
Europe | 36 (10%) | 0 (0%) | 36 (11%) | 0 (0%) |
North America | 136 (39%) | 3 (21%) | 128 (40%) | 5 (63%) |
South America | 10 (3%) | 1 (7%) | 8 (2%) | 1 (13%) |
Care sector | ||||
Primary | 157 (45%) | 1 (7%) | 153 (47%) | 3 (38%) |
Secondary | 135 (39%) | 8 (57%) | 124 (38%) | 3 (38%) |
Primary and secondary | 54 (16%) | 5 (36%) | 47 (15%) | 2 (25%) |
Study area region type | ||||
Urban | 142 (41%) | 10 (71%) | 127 (39%) | 5 (63%) |
Rural | 18 (5%) | 2 (14%) | 16 (5%) | 0 (0%) |
Urban and rural | 186 (54%) | 2 (14%) | 181 (56%) | 3 (38%) |
Distance type | ||||
Travel time | 249 (72%) | 9 (64%) | 238 (73%) | 2 (25%) |
Travel distance | 56 (16%) | 2 (14%) | 54 (17%) | 0 (0%) |
Euclidean distance | 41 (12%) | 3 (21%) | 32 (10%) | 6 (75%) |
Indicator computation | ||||
Primary computation | 338 (98%) | 14 (100%) | 316 (98%) | 8 (100%) |
Secondary use | 8 (2%) | 0 (0%) | 8 (2%) | 0 (0%) |
Application case | ||||
Descriptive | 189 (55%) | 8 (57%) | 178 (55%) | 3 (38%) |
Covariate | 67 (19%) | 2 (14%) | 63 (19%) | 2 (25%) |
Exploratory | 51 (15%) | 2 (14%) | 48 (15%) | 1 (13%) |
Comparison | 39 (11%) | 2 (14%) | 35 (11%) | 2 (25%) |