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Table 5 Comparisons between models constructed using the NIR spectra from ASD FieldSpec®3 and Polychromix Phazir™ with various wavelengths

From: A high-throughput quantification of resin and rubber contents in Parthenium argentatum using near-infrared (NIR) spectroscopy

 DRY + IRRDRYIRR
\({\text{R}}_{\text{P}}^{2}\)RMSEPRMSECRMSEP/RMSECFRPDP\({\text{R}}_{\text{P}}^{2}\)RMSEPRMSECRMSEP/RMSECFRPDP\({\text{R}}_{\text{P}}^{2}\)RMSEPRMSECRMSEP/RMSECFRPDP
Resin
 ASD (750–2500 nm)0.7641.4861.4371.03462.0560.8291.2001.0701.12172.4130.7651.3431.2971.03672.065
 ASD (1100–2400 nm)0.7721.4601.4351.01772.0920.8461.1391.1041.03272.5420.7681.3341.2731.04872.078
 ASD (1600–2400 nm)0.7581.5031.4781.01772.0320.8371.1701.1401.02672.4740.7421.4071.3511.04271.971
 Polychromix (1600–2400 nm)0.6561.7911.8240.98261.7050.6991.5681.6280.96361.8470.6171.7151.6821.02071.617
Rubber
 ASD (750–2500 nm)0.7560.7530.7311.03072.0240.7800.7240.6611.09572.1280.7550.6470.6181.04762.019
 ASD (1100–2400 nm)0.7590.7500.7411.01272.0330.7930.7020.6851.02472.1960.7460.6580.6331.03951.986
 ASD (1600-2400 nm)0.7200.8080.8051.00451.8870.7520.7690.7501.02562.0050.7570.6440.6121.05372.029
 Polychromix (1600–2400 nm)0.6330.8850.8900.99461.7220.6440.8550.9070.94271.8020.5880.8390.7851.06961.558
  1. All the models were constructed using the optimal combination of standard normal variate (SNV) + de-trending (DT) and Savitzky–Golay 2nd derivative under external validation (EV) context
  2. \({\text{R}}_{\text{P}}^{2}\), coefficient of determination; RMSEP, root mean squared error of prediction; RMSEC, root mean squared error of calibration; F, number of factors used in calibration; RPD, ratio of performance over prediction