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Table 1 Evaluation of literature multivariate models for lignin S/G prediction

From: High-throughput prediction of eucalypt lignin syringyl/guaiacyl content using multivariate analysis: a comparison between mid-infrared, near-infrared, and Raman spectroscopies for model development

Method # of samples SEC1 SEP2 RM-SEC3 RM- SECV4 Random Val. Set RM-SEP5 r-Val6 R2Cal7 R2Val8 F9 Ref
Raman 10 - - 0.02 (S) 0.04 (G) - N 0.04 (S) 0.04 (G) 0.993 (S) 0.992 (G) 0.996 (S) 0.997 (G) 0.985 (S) 0.986 (G) - [15]
Raman 55 (Cal) 25 (Val) 0.07 0.32 - - Y - 0.935 0.996 0.874 5 [16]
Raman 63 (Cal) 30 (Val) 0.32 0.35 - - Y - 0.919 0.887 0.845 2 [23]
Raman 9 - - - - N - - - 0.983 - [20]
MIR 5 - - - - - - - - - - [14]
MIR 5 - - - - - - - - - - [24]
MIR 65 - - - - - - - - 0.91-0.98 - [25]
MIR 15 - - - - - - - - - - [26]
NIR 42 (Cal) 36 (Val) - - - 0.025-0.033 Y 0.025-0.036 0.959-0.980 0.95-0.97 0.92-0.96 3-5 [13]
NIR 267 (Cal) - - 0.176 (S) 0.202 (G) 0.005 (H) 0.201 (S) 0.202 (G) 0.005 (H) N - 0.979 (S) 0.979 (G) 0.843 (H) 0.968 (S) 0.957 (G) 0.731 (H) 0.958 (S) 0.957 (G) 0.710 (H) 8 [17]
NIR 135 (Cal) 45 (Val) - 0.124 - 0.121 Y - 0.686 0.583 0.47 5-7 [19]
NIR 26 (Cal) 8 (Val) 0.26 0.3 - - Y - 0.938 0.96 0.88 6 [22]
  1. 1Standard Error of Calibration.
  2. 2Standard Error of Prediction.
  3. 3Root Mean Standard Error of Calibration.
  4. 4Root Mean Standard Error of Cross-Validation.
  5. 5Root Mean Standard Error of Prediction.
  6. 6Coefficient of Correlation for Validation Set.
  7. 7Coefficient of Determination for Calibration Set.
  8. 8Coefficient of Determination for Validation Set.
  9. 9#of Factors.
  10. Italicized values calculated by the authors.
  11. MIR = mid-infrared spectroscopy, NIR = near-infrared spectroscopy, Cal = calibration set, Val = validation set, S = syringyl, G = guaiacyl, H =p -hydroxyphenol, Y = yes, N = no.