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Table 1 Summary of May 2011 closed user group billing statements

From: Mobile phones and social structures: an exploration of a closed user group in rural Ghana

Topic Free Airtel to Airtel Free Airtel to Other Airtel to Airtel Airtel to Other
# Of accounts 61 60 10 20
# of calls/data/SMS 4,184 3,982 63 158
Range of calls/data/SMS, by account 2 to 219 1 to 183 1 to 22 1 to 27
Average # calls/data/SMS 69 66 6 8
Median # calls/data/SMS 59.5 62 3.5 5.5
IQR of calls/data/SMS 30.25 – 101.5 42 – 88.5 2.25 – 8.25 3 – 9.25
Range of total call duration 1.8 – 355.6 minutes 0.1 – 368.8 minutes 0.4 – 114.2 minutes 1.6 – 89.3 minutes
Range of average call duration 0.67 – 4.1 minutes 0.1 – 4.1 minutes 0.1 – 38.1 minutes 0.97 – 10 minutes
Average call duration for one call 1.8 minutes 1.9 minutes 3.9 minutes 2.67 minutes
Median call duration 99.6 minutes 107.2 minutes 6.7 minutes 16.7 minutes
IQR of call duration 53.8 – 171.8 minutes 70.1 – 173.4 minutes 1.2 – 18.9 minutes 9.2 – 25.1 minutes