Table 1.

Bluetooth interactions. These are listed in bt.csv and are formatted as described above.

column name	column description
timestamp	Timestamp in seconds from the beginning of the observation period (as reported by the device. Note, that because of differences in the internal clock of different devices, some of the measurements will not be perfectly aligned.)
user_a	ID of one user (ego).
user_b	ID of the other user (alter). 0–850 for participants of the study, −1 for empty scans, −2 for any non-participating device.
rssi	Received Signal Strength Indication, measured in dBm, a rough proxy for distance between devices (the higher the absolute value, the higher the distance)
Summary: 5,474,289 records, 706 total users