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. 2016 Oct 17;24(3):752–775. doi: 10.3758/s13423-016-1170-y

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© The Author(s) 2016

Open Access This 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.

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Fig. 2 — Galton squeeze diagrams for the data in Fig. 1b. a mean z scores for the bottom (Q1), second (Q2), third (Q3), and top (Q4) quartiles of the Y measure plotted against the equivalent z scores for X. The funnel pattern is regression to the mean. The equivalent analysis based on quartiles for z(X) is shown in b and indicates the bi-directionality of regression to the mean.