Table 1.

Eigenvalues of the correlation matrix ¹.

	NIRS			FTIRS
PC	Eigenvalue	Proportion of Variance Explained (%)	Cumulative Variance (%)	Eigenvalue	Proportion of Variance Explained (%)	Cumulative Variance (%)
1	456.4 (4.8)	76.1	76.1	271.0 (5.2)	80.9	80.9
2	95.4 (3.7)	15.9	92.0	49.9 (4.0)	14.9	95.8
3	41.8 (6.5)	7.0	98.9	9.6 (3.6)	2.9	98.7
4	3.6 (1.3)	0.6	99.5	1.8 (0.3)	0.6	99.2
5	1.3 (0.1)	0.6	99.7	1.3 (0.2)	0.4	99.6
6	0.85 (0.08)	0.14	99.88	0.29 (0.04)	0.09	99.68
7	0.36 (0.03)	0.06	99.94	0.16 (0.03)	0.05	99.73
8	0.13 (0.01)	0.02	99.96	0.09 (0.01)	0.03	99.76
9	0.06 (0.01)	0.01	99.97	0.07 (0.01)	0.02	99.78
10	0.04 (0.01)	0.01	99.98	0.06 (0.01)	0.02	99.80

¹ Values are the means of the five folds used as training data sets. SD values in brackets.