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Table 3 Optimal parameters determined for Gap 1st derivative cross validation experiments

From: Developing a non-invasive tool to assess the impact of oxidation on the structural integrity of historic wool in Tudor tapestries

Product ratio Spectral region (nm) Pathlength correction (1st derivative) SECV Factors R2 PRESS Number of outliers (spectral, residual outliers with F test uncertainty 99%)
CA/CD 1400–1820
1840–2300
SNV-detrend 0.09 7 0.69 1.21 4
CA/CM 1300–1820
1840–2300
SNV-detrend 0.03 4 0.50 0.11 19
CD/CM 1400–1820
1840–2300
MSC 0.07 6 0.66 0.72 5