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Table 5 PLS calibration and validation parameters for regression models for pH and DP using NIR spectra obtained with the PHAZIR hand-held spectrometer; n-number of samples

From: Material properties of Islamic paper

PLS model Calibration Validation
n RMSEC RMSECV R 2 n RMSEP Factors R 2
pH 52 0.37 0.45 0.70 18 0.72 4 0.47
DP 45 263 298 0.60 15 177 3 0.78