Time in Privacy Preserving LBSs: An Overlooked Dimension

Table 3

ADV and ADV^𝑇 cabs data.

(a) ADV.

𝑅𝑔	daily
𝑖𝑑=54	989
𝑖𝑑=293	808
𝑖𝑑=404	858
𝑖𝑑=475	565
𝐸(𝑅𝑔)	5.62
𝑃(𝑅𝑔)	49.20

(b) 𝐴𝐷𝑉^𝑇∶𝑇_𝑗,1≤𝑗≤12 (2 hours)

𝑅𝑔	𝑇1	𝑇2	𝑇3	𝑇4	𝑇5	𝑇6	𝑇7	𝑇8	𝑇9	𝑇10	𝑇11	𝑇12
𝑖𝑑=54	244	118	52	52	13	85	207	35	72	45	29	37
𝑖𝑑=293	14	48	9	10	14	50	26	67	229	80	160	101
𝑖𝑑=404	12	33	632	111	14	17	0	6	0	0	27	6
𝑖𝑑=475	27	19	23	81	81	159	47	4	13	34	39	38
𝐸(𝑅𝑔,𝑇𝑗)	1.94	2.43	1.33	2.50	2.65	2.67	1.92	1.77	2.29	2.67	2.63	2.61
𝑃(𝑅𝑔,𝑇𝑗)	3.85	5.39	2.51	5.65	6.30	6.36	3.79	3.43	4.90	6.35	6.22	6.09