Table 2. A matrix of predicted class membership of seed lot fractions in the test set (n = 40 for each seed lot fraction) by four-class PLS-DA and OPLS-DA (values in parenthesis) models developed using different NIR spectral regions.
A) Full NIR region (780–2500 nm)
Seed lot fractions	1	2	3	4	No class	1 & 2	1 & 3	1 & 4	2 & 3	2 & 4	3 & 4	%Correct
Empty (1)	16(15)	12(11)	4(4)	0(0)	5(7)	1(1)	2(2)	0(0)	0(0)	0(0)	0(0)	40(38)
Insect-attacked (2)	3(2)	31(31)	0(0)	0(0)	4(4)	2(3)	0(0)	0(0)	0(0)	0(0)	0(0)	78(78)
Shriveled (3)	7(5)	0(0)	21(26)	0(0)	2(3)	0(0)	10(6)	0(0)	0(0)	0(0)	0(0)	53(65)
Filled-viable (4)	0(1)	0(0)	0(0)	38(38)	2(1)	0(0)	0(0)	0(0)	0(0)	0(0)	0(0)	95(95)
B) Shorter NIR region (780–1100 nm)
Seed lot fractions	1	2	3	4	No class	1 & 2	1 & 3	1 & 4	2 & 3	2 & 4	3 & 4	%Correct
Empty (1)	14(16)	11(11)	3(3)	0(0)	11(10)	1(0)	0(0)	0(0)	0(0)	0(0)	0(0)	35(40)
Insect-attacked (2)	2(2)	33(33)	0(0)	0(0)	3(3)	2(2)	0(0)	0(0)	0(0)	0(0)	0(0)	83(83)
Shriveled (3)	4(5)	0(0)	28(26)	0(0)	4(6)	0(0)	4(3)	0(0)	0(0)	0(0)	0(0)	70(65)
Filled-viable (4)	1(1)	0(0)	0(0)	39(39)	0(0)	0(0)	0(0)	0(0)	0(0)	0(0)	0(0)	98(98)
C) Longer NIR region (1100–2500 nm)
Seed lot fractions	1	2	3	4	No class	1 & 2	1 & 3	1 & 4	2 & 3	2 & 4	3 & 4	%Correct
Empty (1)	18(19)	11(12)	2(1)	0(0)	7(7)	0(0)	2(1)	0(0)	0(0)	0(0)	0(0)	45(48)
Insect-attacked (2)	2(0)	33(31)	0(1)	0(0)	3(6)	2(2)	0(0)	0(0)	0(0)	0(0)	0(0)	83(78)
Shriveled (3)	10(16)	0(0)	22(14)	0(0)	2(8)	0(0)	6(2)	0(0)	0(0)	0(0)	0(0)	55(35)
Filled-viable (4)	1(0)	0(0)	0(0)	39(39)	0(0)	0(0)	0(0)	0(1)	0(0)	0(0)	0(0)	98(98)