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. 2016 Dec 15;6:38938. doi: 10.1038/srep38938

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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We compared precisions of all indices with perturbation on Email, which are SPM, NMF − D1, NMF − A1, NMF − D2 and NMF − A2. Different fractions of training set f are 0.6, 0.7, 0.8 and 0.9. The x-axis is perturbation ratio η varied from 0.02 to 0.1. The y-axis is the precision averaged over 100 independent runs.