Table 2: Results of interval partial least squares (iPLS) models for predictions of antioxidant activity of brown rice.

TPC (mg GAE/g)DPPH (mg GAE/g)
Selected intervalsRMSEPaLVsbSelected intervalsRMSEPLVs

Raw data3, 6, 80.17942, 5, 60.1756
Smoothing 3, 4, 80.13152, 4, 60.1884
D22, 4, 50.11741, 3, 40.1814
SNV3, 4, 60.06242, 3, 60.1415

RMSEP: root mean squared error of prediction by the final iPLS with selected spectral intervals.
bNumber of components of the final iPLS models including all the selected spectral intervals.