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. 2014 Jun 25;7:39. doi: 10.1186/1755-8794-7-39

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Copyright © 2014 Markunas et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Weighted PCA plots for individual sparse k-means clustering. Each point represents a patient and each class of patients is shown in a different color (blue or red). (A) Dura (Proportion of variance explained by PC1 (0.26) and PC2 (0.07)), (B) Blood (Proportion of variance explained by PC1 (0.46) and PC2 (0.09)), and (C) Cranial sparse k-means clustering analysis (Proportion of variance explained by PC1 (0.54) and PC2 (0.18)). The “true” patient class is unknown and is based on the sparse k-means clustering assignment.