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. 2012 May 23;10(5):1180–1191. doi: 10.3390/md10051180

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© 2012 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Orthogonal projection to latent structures discriminant analysis (OPLS-DA) S-plot of oyster shell samples in positive ion mode (group A: the medicinal group; group B: the cultured group). Each point represents an individual extracted mass-retention time pair (EMRT). The Y-axis denotes confidence of a marker’s contribution to the group differences, and the X-axis denotes the contribution of a particular marker to the group differences. The top 20 VIP variables were marked in the S-plots.