Max. trips per user | 5 |
---|---|
Privacy budget | 50.00 |
User privacy | True |
Budget split | Visits per tile: 10 |
Evaluation dev. mode | False |
Excluded analyses | OD flows, Travel time, Jump length, Trips per user, User time delta, Radius of gyration, User tile count, Mobility entropy |
Noise has been added to provide differential privacy. The 95%-confidence interval gives an intuition about the reliability of the noisy results.
This report provides differential privacy guarantees. The concept of differential privacy is that the output of an algorithm remains nearly unchanged if the records of one individual are removed or added. In this way, differential privacy limits the impact of a single individual on the analysis outcome, preventing the reconstruction of an individual's data. Broadly speaking, this is achieved by adding calibrated noise to the output and the amount of noise is defined by the privacy_budget. Depending on the setting of user_privacy, noise is either calibrated to only protect single trips (item-level privacy) or to protect the privacy of users (user-level privacy). The privacy budget is split between all analyses. The cofiguration table provides information on the used privacy_budget, the budget_split and user_privacy. For each analysis, information is provided on the amount of utilized privacy budget.
The Laplace mechanism is used for counts and the Exponential mechanism for the five number summaries. Details on the notion of differential privacy and the used mechanisms are provided in the documentation.
privacy budget: 3.125
estimate | 95% CI: +/- | |
---|---|---|
Number of records | 1,709 | 38.2 |
Number of distinct trips | 861 | 38.1 |
Number of complete trips (start and and point) | 848 | 38.3 |
Number of incomplete trips (single point) | 13 | 19.2 |
Number of distinct users | 186 | 3.8 |
Number of distinct locations (lat & lon combination) | 1,697 | 38.3 |
privacy budget: 3.125
estimate | 95% CI: +/- | |
---|---|---|
User ID (uid) | 0 | 47.9 |
Trip ID (tid) | 0 | 47.9 |
Timestamp (datetime) | 0 | 47.9 |
Latitude (lat) | 0 | 47.9 |
Longitude (lng) | 26 | 47.9 |
privacy budget: 3.125
95% CI: +/- 1.3 %
Timestamps have been aggregated by week.
Min. | 2007-04-15 |
---|---|
Max. | 2012-04-14 |
privacy budget: 3.125
95% CI: +/- 0.6 %
privacy budget: 3.125
95% CI: +/- 0.6 %
privacy budget: 31.25
95% CI: +/- 1.0 visit(s)
209 (11.76%) points are outside the given tessellation (95% confidence interval ± 1).
Mean | 2 |
---|---|
Min. | 0 |
25% | 0 |
Median | 0 |
75% | 0 |
Max. | 345 |
privacy budget: 3.125
95% CI: +/- 4.8 visit(s)
The average of each tile over all time windows equals 1 (100% of average traffic). A value of < 1 (> 1) means that a tile is visited less (more) frequently in this time window than it is on average.
The average of each tile over all time windows equals 1 (100% of average traffic). A value of < 1 (> 1) means that a tile is visited less (more) frequently in this time window than it is on average.
User configuration of timewindows: ['2 - 6', '6 - 10', '10 - 14', '14 - 18', '18 - 22']