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• W2017718992 abstract "Spectral signal intensities, especially in ‘real-world’ applications with nonstandardized sample presentation due to uncontrolled variables/factors, commonly require additional spectral processing to normalize signal intensity in an effective way. In this study, we have demonstrated the complexity of choosing a normalization routine in the presence of multiple spectrally distinct constituents by probing a dataset of Raman spectra. Variation in absolute signal intensity (90.1% of total variance) of the Raman spectra of these complex biological samples swamps the variation in useful signals (9.4% of total variance), degrading its diagnostic and evaluative potential. Using traditional spectral band choices, it is shown that normalization results are more complex than generally encountered in traditionally designed sample sets investigating limited chemical species. We demonstrate that no choice of a single band proves to be appropriate for predicting all the reference parameters, instead requiring a tailored normalization routine for each parameter. Of the reference parameters studied in the chosen system, signals from pathogenic adducts in ocular tissues called advanced glycation endproducts were most prominent when normalizing about the 1550–1690 cm−1 region of the spectrum (17.5% of total variance, compared with 0.3% for unnormalized), while prediction of pentosidine and gender were optimized by normalization about the 1570 (R2 = 0.97 vs 0.57 for unnormalized) and 1003 cm−1 (p < 0.0000001 vs p < 0.01 for unnormalized) bands, respectively. The data obtained point to the extreme sensitivity of multivariate analysis to signal intensity normalization. Some general guidelines for making appropriate band choices are given, including the use of peak-finding routines. Copyright © 2008 John Wiley & Sons, Ltd." @default.
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• W2017718992 date "2009-04-01" @default.
• W2017718992 modified "2023-10-16" @default.
• W2017718992 title "Effect of signal intensity normalization on the multivariate analysis of spectral data in complex ‘real-world’ datasets" @default.
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• W2017718992 doi "https://doi.org/10.1002/jrs.2146" @default.
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