A hybrid machine learning method for increasing the performance of network intrusion detection systems

Journal of Big Data

Table 4 Total data comparison between before and after data reduction

Dataset	Class	Total data before data reduction	Total data after data reduction
Dataset	Class	Total data before data reduction	std = 1	std = 2	std = 3
NSL-KDD [13]	DoS	113,270	110,984	111,229	111,819
	Probe	78,999	78,937	78,937	78,938
	R2L	68,338	68,257	68,268	68,278
	U2R	67,395	67,382	67,382	67,382
NSL-KDD [13]	Attack-Normal	125,973	125,827	125,827	125,827
UNSW-NB15 [27]	Attack-Normal	175,341	169,599	172,543	173,880