An Efficient Cost-Sensitive Feature Selection Using Chaos Genetic Algorithm for Class Imbalance Problem

Table 1

Cost metrics of intrusion categories.

Main category (by results)	Description	DCost	RCost
U2R	Illegal root access is obtained	DCost = 100	RCost = 60
R2L	Illegal user access is obtained from outside	DCost = 50	RCost = 40
DOS	Denial-of-Service of target is accomplished	DCost = 30	RCost = 15
PROBE	Information about the target is gathered	DCost = 2	RCost = 7
Normal	Normal events	DCost = 0	RCost = 0