Table 3.

Feature reduction based on rough sets.

Feature subset	Reduction results	Dimensionality
RS1	fs4, fs16, fs17, fs18, fi2, fi4, fi6, fi7, fi8, ft2, ft4, ft5, ft6, ft7, ft8, ft9, ft10, ft11, ft13, ft14, ft15, ft16	21
RS2	fs4, fs9, fs16, fs18, fi1, fi2, fi5, ft2, ft5, ft6, ft8, ft9, ft10, ft11, ft12, ft13, ft15	17
RS3	fs9, fs17, fs18, fi1, fi2, fi5, fi7, fi8, ft2, ft6, ft7, ft8, ft9, ft10, ft11, ft12, ft14, ft15, ft16	19
RS4	fs9, fs16, fs18, fi1, fi2, fi5, fi7, fi8, ft5, ft6, ft7, ft8, ft9, ft10, ft11, ft12, ft14, ft15, ft16	19
RS5	fs9, fs16, fs17, fs18, fi1, fi2, fi4, fi5, fi7, fi8, ft2, ft5, ft6, ft7, ft8, ft9, ft10, ft12, ft15, ft16	20