[Retracted] Design of Customer Churn Early Warning System Based on Mobile Communication Technology Based on Data Mining

Table 2

Customer churn profile.

	Total application	Unusual use	0 call charges	Under the call 40% drop	Lost	Churn rate (%)
Training set	32000	1030	7	2250	3300	10.3
Test set	31300	960	12	1669	2607	8.5

Note. “Normal use” includes user suspension, user disassembly, and double-stop for arrears.