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. 2014 Aug 6;9(8):e104621. doi: 10.1371/journal.pone.0104621

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© 2014 Chang, Ho

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Panel A shows the PCA scores plot for caffeinated and decaffeinated coffee samples, panel B displays the model validation plot for PLS-DA model between caffeinated and decaffeinated coffee samples, and panel C illustrates the OPLS-DA model between caffeinated and decaffeinated coffee samples (1 predictive component, 1 orthogonal component, R²(Y) = 1, Q²(cum) = 0.998).