| Classification variable | Numerical variable | ||||
| Variable | Symbol | Variable | Symbol | Variable | Symbol |
| Customer credibility | Y | Times of payment arrearage | T1 | Totalnumber of communicational friends | T9 |
| IS converged with other service | C1 | Amount of payment arrearage | T2 | Number of intranet communicational friends | T10 |
| IS real-name registered | C2 | Online duration | T3 | Number of outer communicational friends | T11 |
| IS bound with bankcards | C3 | Accumulative days of communication | T4 | Accumulation of used data | T12 |
| IS an attractive number | C4 | Times of accumulative calls | T5 | Monthly average of the on-bill amounts | T13 |
| IS registered to APP’s | C5 | Monthly average of arrearages | T6 | Monthly average of payments | T14 |
| IS a grouped number | C6 | Accumulative callduration | T7 | Accumulation of overdue payment arrearages | T15 |
| On/off line | C7 | Times of being suspended | T8 | Times of international roaming | T16 |