Rapid Analysis of Geographical Origins and Age of Torreya grandis Seeds by NIR Spectroscopy and Pattern Recognition Methods

Table 2

Discrimination of age and geographical origins of T. grandis seeds by PLSDA.

Preprocessing	Age classification			Geographical origins classification
	Sensitivity^a	Specificity^b	Lv^c	Sensitivity	Specificity	Lv
Raw data	0.727 (24/33)	0.839 (26/31)	10	0.879 (29/33)	0.923 (36/39)	10
Smoothing	0.636 (21/33)	0.807 (25/31)	10	0.879 (29/33)	0.923 (36/39)	10
2nd derivative	0.939 (31/33)	0.871 (27/31)	7	1.000 (33/33)	1.000 (39/39)	6
SNV	0.788 (26/33)	0.774 (24/31)	10	0.909 (30/33)	0.897 (35/39)	10

^aNumbers in parentheses indicate TP/(TP + FN).
^bNumbers in parentheses indicate TN/(TN + FP).
^cNumbers of PLSDA latent variables.