Fault Diagnosis for Reducer via Improved LMD and SVM-RFE-MRMR

Table 4

Nested feature subset.

Characteristic number	1	2	3	4	5	6	7	8
Characteristic code	3	3,2	3,2,4	3,2,4,; 7	3,2,4,; 7,1	3,2,4,; 7,1,8	3,2,4,7,; 1,8,6	3,2,4,7,; 1,8,6,5
Subset symbol