Table 4.

SSC and acidity of the potato samples measured by NIR spectroscopy and predicted by various models.

Variable	Smoothing	Model	R2val	R2cal	RMSEval	RMSEcal
SSC	Moving Average	PCR	0.716	0.825	0.199	0.153
		PLS	0.770	0.938	0.179	0.092
		SVR	0.551	0.701	0.253	0.215
	Gaussian Filter	PCR	0.781	0.878	0.174	0.128
		PLS	0.789	0.943	0.171	0.087
		SVR	0.540	0.687	0.255	0.219
	Median Filter	PCR	0.711	0.823	0.201	0.155
		PLS	0.801	0.943	0.168	0.088
		SVR	0.526	0.668	0.259	0.224
	Savitzky–Golay	PCR	0.746	0.869	0.189	0.133
		PLS	0.787	0.937	0.173	0.093
		SVR	0.515	0.653	0.261	0.228
pH	Moving Average	PCR	0.871	0.927	0.141	0.105
		PLS	0.906	0.971	0.121	0.066
		SVR	0.496	0.770	0.308	0.252
	Gaussian Filter	PCR	0.872	0.929	0.141	0.103
		PLS	0.914	0.978	0.116	0.058
		SVR	0.569	0.806	0.292	0.232
	Median Filter	PCR	0.684	0.803	0.210	0.163
		PLS	0.931	0.984	0.104	0.049
		SVR	0.523	0.789	0.302	0.243
	Savitzky–Golay	PCR	0.872	0.929	0.142	0.104
		PLS	0.920	0.981	0.111	0.053
		SVR	0.498	0.770	0.308	0.252