Study on the Effect of Apple Size Difference on Soluble Solids Content Model Based on Near-Infrared (NIR) Spectroscopy

Table 6

Results of the models built by CARS and SPA.

Sample selection algorithm	Modeling set fruit diameter	Predicted fruit set diameter	Number of variables	Rc	Rmsec/%	Rp	RMSEP/%
CARS	75 mm–85 mm	65 mm–75  mm	61	0.932	0.568	0.854	0.611
		85 mm–95  mm		0.932	0.568	0.863	0.586
SPA	75 mm–85 mm	65 mm–75  mm	16	0.815	0.942	0.744	1.340
		85 mm–95  mm		0.815	0.942	0.665	1.942