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. 2019 Jul 19;2(1):16. doi: 10.5334/joc.72

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Copyright: © 2019 The Author(s)

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC-BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See http://creativecommons.org/licenses/by/4.0/.

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Different types of interactions researchers may be interested in. Left panel: fully crossed interaction. Middle panel: the effect of A is only present for one level of B. Right panel: The effect of A is very strong for one level of B and only half as strong for the other level.