FTIR-ATR-based prediction and modelling of lignin and energy contents reveals independent intra-specific variation of these traits in bioenergy poplars

Table 2 Performance indicators of Fourier transform infrared spectroscopy with attenuated total reflection-based partial least squares regression model for predication of gross calorific values within a range from 19767 to 17260 J g^-1 for the calibration set and from 18255 to 17345 J g^-1 for the external validation set with various preprocessing methods as well as automatic restriction of the wavenumber range

^a Descriptor explanations are as follows: R² = coefficient of determination (a measure of the degree of fit of the regression); RMSEC = root mean square error of the calibration samples; RMSECV = root mean square error of the cross validation samples; RMSEP = root mean square error of the prediction samples; BLC = Baseline correction, Rubberband method.
^b The wavenumbers for the mid-infrared region are 2000 - 700 cm^-1.
^c The wavenumber range resulting from automatic restriction is 1770 - 990 cm^-1.

ISSN: 1746-4811