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Table 2 Summary statistics for the PLS-2 calibration model for composition using the Thermo FT-NIR spectrometer with autosampler

From: Rapid analysis of composition and reactivity in cellulosic biomass feedstocks with near-infrared spectroscopy

Constituent Samples Factors RMSEC RMSECV R 2 Slope Intercept
Glucan 232 9 1.7 1.9 0.91 0.91 2.9
Xylan 232 9 1.1 1.2 0.87 0.87 2.3
Lignin 232 9 1.1 1.2 0.88 0.89 1.7
Ash 232 9 1.3 1.4 0.84 0.84 1.0
  1. RMSECV values are slightly higher than the uncertainty of the primary analytical methods. Slope and intercept describe the line of best fit for cross-validation.
  2. RMSEC root-mean-square-error of the calibration model, RMSECV root-mean-square-error of cross-validated model, R 2 square of the correlation coefficient of the cross-validated model.