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. 2019 Sep 26;9:13928. doi: 10.1038/s41598-019-50443-2

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Predicting collagen preservation groups from NIR spectra. PLS-DA prediction scores showing predicted membership of specimens to the Sample (scores above 0) or Do Not Sample (scores below 0) groups. Specimens are grouped by their actual (not predicted) collagen yields. (a) PLS-DA prediction scores when the Sample group was defined as >3% collagen. Classification success for specimens in the validation set was 83%. (b) PLS-DA prediction scores when the Sample group was defined as >1% collagen. Classification success for specimens not included in the calibration dataset was over 90%.