Table 4.

Raw CDR data used in this study.

Item	Description
Day	Day of the record
Hour	Time of the record
Duration	Duration of the call
Code origin	The area code of the originating station of the call
ID origin	The encrypted ID of the originating source of the call
Code destination	area code of the destination station
ID destination	The encrypted ID of the destination of the call
Cell ID (origin)	The antenna code that processed the call at the source
Traffic	Type of traffic: international roaming, SMS, etc.
Hold_orig	The name of the carrier that processed the call at the source
Hold_dest	Name of the carrier that processed the call at the destination