Feature name | Clarification and description | Feature type | |
---|---|---|---|
1 | Active days | The number of days the user has used the app | Temporal Activity |
2 | Consecutive days | The highest number of consecutive days the user has used the app | Temporal Activity |
3 | Weekdays | The number of distinct weekdays the user has used the app | Temporal Activity |
4 | Period | The number of days between the first and last usage | Temporal Activity |
5 | Total time | The total amount of time the app has been running [s] | Temporal Activity |
6 | Variation of time stamp | The standard deviation of all time stamps [s] | Temporal Activity |
7 | Total distance | The total distance the user has covered [m] | Spatial Distance |
8 | Maximum distance | The distance between two most distant points a user has visited [m] | Spatial Distance |
9 | Daily distance | The average distance covered in a day [m] | Spatial Distance |
10 | Variation of daily distance | The standard deviation of the average distances per day [m] | Spatial Distance |
11 | Daily centroid distance |
The average distance of two consecutive Consecutive refers to the next day the app has been used, which does not necessarily mean the immediately following day. daily centroids [m] The centroid is the centroid of the daily concave hull |
Spatial Distance |
12 | Variation of daily centroid distance | The standard deviation of the distance between two consecutive daily centroids [m] | Spatial Distance |
13 | Distance to centroid | The average distance between the daily centroid and the overall centroid [m] | Spatial Distance |
14 | Variation of distance to centroid | The standard deviation of the distance between the daily centroid and the overall centroid [m] | Spatial Distance |
15 | Average step length |
The average distance covered in a move segment A move segment describes a segment of continuous movement without a stop segment. A stop segment is a series of GPS tuples with almost no movement (sum of covered distances shorter than 10 m) in a five-minute window (see also Sect. 4). [m] |
Spatial Distance |
16 | Standard deviation of step length | The standard deviation of the distances covered in move segments [m] | Spatial Distance |
17 | Area |
The total area the user has covered [m^{2}] We used a concave hull to compute the areal measures. |
Spatial Area |
18 | Circumference | The circumference of the total area the user has covered [m] | Spatial Area |
19 | Complexity | The complexity of the total area (area/circumference) | Spatial Area |
20 | Compactness | The compactness of the total area [4∗area/π∗maximum distance squared] | Spatial Area |
21 | Daily area | The average area of the daily areas covered [m^{2}] | Spatial Area |
22 | Variation of daily area | The standard deviation of the daily areas covered [m^{2}] | Spatial Variability |
23 | Overlap | The average percent of overlap of two consecutive daily areas covered [%] | Spatial Variability |
24 | Variation of overlap | The standard deviation of the percentage of overlap of two consecutive daily areas covered [%] | Spatial Variability |
25 | Spatial clusters |
The number of clusters of start, stop or end points See also the definition of significant locations in Sect. 5. |
Spatial Variability |
26 | Number of moves | The absolute number of move segments | Spatio-Temporal Dynamics |
27 | Average speed | The average speed in the move segments [m/s] | Spatio-Temporal Dynamics |
28 | Standard deviation of speed | The standard deviation of the speed in the move segments [m/s] | Spatio-Temporal Dynamics |
29 | Number of stops | The total number of stops | Spatio-Temporal Dynamics |
30 | Total stop duration | The total duration of all stops [s] | Spatio-Temporal Dynamics |
31 | Stop duration | The average duration of a stop [s] | Spatio-Temporal Dynamics |
32 | Variation of stop duration | The standard deviation of the stops [s] | Spatio-Temporal Dynamics |