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

Journal of Big Data

Table 5 Outliers in the dataset

Dataset	Class	Total data after data reduction
Dataset	Class	std = 1	std = 2	std = 3
NSL-KDD [13]	DoS	2286	2041	1451
	Probe	62	62	61
	R2L	81	70	60
	U2R	13	13	13
NSL-KDD [13]	Attack–normal	146	146	146
UNSW-NB15 [27]	Attack–normal	5742	2798	1461