Table 1.

Statistical classification error rates (and their corresponding standard deviation) by using SVM with different parameters on four microarray data sets (%)

DATASET	SVM	PCASVM	GAPCASVM	PLSSVM	GAPLSSVM	PPSVM	GAPPSVM
C = 10, σ = 0.01 for SVM
CNS	40.4(8.6)	36.4(4.4)	35.2(1.6)	36.6(2.8)	35.0(5.6)	36.2(5.3)	35.0(7.0)
COLON	34.6(5.4)	31.3(7.0)	29.6(7.5)	29.5(8.2)	28.8(9.2)	33.2(6.7)	30.5(7.2)
LEUKEMIA	27.0(7.1)	26.2(6.1)	23.2(6.4)	20.4(7.0)	16.2(5.9)	22.9(7.5)	21.7(7.2)
LUNG	4.2(7.2)	4.1(5.9)	3.9(6.2)	3.7(6.2)	3.3(5.8)	4.4(5.5)	4.0(7.3)
Average	26.8(7.1)	24.5(5.9)	22.9(5.4)	22.5(6.1)	20.8(6.7)	24.1(6.2)	22.8(7.2)
C = 10, σ = 10 for SVM
CNS	40.6(9.2)	35.7(4.2)	34.4(7.3)	39.6(7.5)	38.4(5.5)	40.0(5.3)	38.7(8.3)
COLON	34.6(5.4)	29.1(8.3)	29.6(7.3)	29.7(8.3)	29.1(9.3)	33.7(6.9)	32.2(7.2)
LEUKEMIA	27.4(6.9)	26.3(6.2)	22.1(6.3)	20.4(7.0)	16.3(6.0)	22.8(7.3)	20.9(7.2)
LUNG	3.7(6.9)	2.9(6.2)	1.7(6.2)	1.6(6.8)	1.6(6.1)	1.6(8.5)	1.5(4.4)
Average	26.5(7.1)	23.4(6.2)	21.9(6.8)	22.8(7.4)	21.3(6.7)	24.5(6.9)	23.3(6.8)
C = 1000, σ = 0.01 for SVM
CNS	37.6(7.6)	35.4(1.7)	34.4(1.0)	36.1(2.9)	35.0(5.4)	36.0(5.0)	35.6(3.1)
COLON	33.7(5.2)	31.0(7.8)	29.9(7.3)	28.9(8.7)	27.8(9.3)	33.4(7.2)	30.1(8.0)
LEUKEMIA	26.8(7.2)	25.8(6.2)	23.3(6.3)	20.5(6.9)	16.4(9.5)	24.0(7.4)	21.0(7.1)
LUNG	4.2(6.9)	4.1(6.5)	3.2(6.2)	3.4(7.2)	3.4(8.4)	4.0(6.3)	3.3(5.8)
Average	25.6(6.8)	24.0(5.5)	22.7(5.2)	22.2(6.4)	20.6(8.2)	24.6(6.5)	22.9(6.0)
C = 1000, σ = 10 for SVM
CNS	41.4(8.7)	35.4(8.6)	34.0(8.4)	40.9(7.6)	38.9(5.8)	42.5(9.1)	39.2(8.8)
COLON	33.9(6.0)	31.0(7.5)	29.7(7.0)	29.0(8.7)	28.5(9.3)	32.8(7.2)	29.7(8.0)
LEUKEMIA	27.9(7.2)	25.0(6.1)	23.1(6.6)	20.5(6.9)	16.4(5.9)	22.6(7.7)	21.1(7.3)
LUNG	3.9(5.8)	2.8(6.5)	1.3(6.8)	1.7(6.3)	1.4(6.9)	3.6(6.3)	1.3(6.4)
Average	26.7(6.9)	23.5(7.2)	22.0(7.2)	23.0(7.3)	21.2(7.0)	25.4(7.6)	22.8(7.6)