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. 2017 Jan 6;17:1. doi: 10.1186/s12874-016-0277-1

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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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Fig. 2 — Calibration Intercept: Calibration intercept in the validation set for SR, PCA and the two newly derived models across all simulation situations. The PLS results were nearly identical to SR/PCA and so are omitted for clarity. Note: σ = 1 was removed from the plot for clarity since the results quantitatively similar to σ = 0.75