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. 2015 Dec 19;16:94. doi: 10.1186/s12868-015-0228-5

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© Aarts et al. 2015

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 — Graphical representations of variants of research design B data. Different possible combinations of cluster-related variation in the mean value of the control condition (i.e., the intercept; $β_{0 j}$ ) and cluster-related variation in the experimental effect ( $β_{1 j}$ ), illustrated for 3 clusters of data: no cluster-related variation (a), only cluster-related variation in the intercept (b), only cluster-related variation in the experimental effect (c), or cluster-related variation in both the intercept and the experimental effect (d)