Variable Description

Raw data

• btnamei: Bluetooth ID of i

• btnamej: Bluetooth ID of j

• episode: The order of Bluetooth detecting record for each pair of nodes within 3-minute gap

• freq: number of detecting records in the episode

• avg_RSSI: average RSSI of detecting records during the episode

• sd_RSSI: standard deviation of RSSI of detecting records during the episode. The value is missing if there is only one records during the period

• s_timestamp: The very first Bluetooth detecting time of each episode in Unix time metric

• e_timestamp: The very last Bluetooth detecting time of each episode in Unix time metric

• dur: The duration (in seconds) of each episode which is calculated by e_timestamp minus s_timestamp plus 60. It takes the value one if there is only one detecting record in the episode (which is identical to that the s_timestamp and e_timestamp are the same).

• waitingtime: The waiting time (in seconds) between any two Bluetooth detecting episodes for each pair of nodes. The value is missing for the first record of each pair of nodes or when there is only record the pair of nodes