《Table 1 The impact of the five intervals on the PLS model for the diesel fuel dataset》

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《A variable importance criterion for variable selection in near-infrared spectral analysis》

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a) Number of spectral variables used in the model；b) number of latent variables used in the model.

To verify the rationality of the C value，five spectral bands with higher（than Q3）and lower（than Q1）C value are investigated.As indicated by the red and blue bars in the figure，the spectral intervals of 1228–1242，1292–1310，1470–1486，1280–1288 and 1490–1550 nm were studied.The former three bands should have positive contributions to the model，and the latter two bands should have negative effects on the model.Taking the full spectra model as a reference，the results obtained by removing the variables in the five spectral intervals are compared in Table 1.