Table 11.

Rank order of the nine domains based on contribution.

Rank order	Feature domain (Total num. of features)	Num. of top 10 features	Num. of top 100 features	Num. of top 200 features	Num. of top 300 features
1	Frequency spectrum of state (308)	4	39	115	183
2	Energy (47)	3	12	16	24
3	Entropy (16)	3	8	10	11
4	Cepstrum (65)	0	14	28	40
5	Time interval (20)	0	14	17	17
6	Frequency spectrum of records (27)	0	5	5	10
7	High-order statistics (16)	0	4	4	7
8	Cyclostationarity (4)	0	2	3	4
9	State amplitude (12)	0	2	2	4