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. 2020 Mar 19;17(4):420–429. doi: 10.1177/1740774520913042

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© The Author(s) 2020

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — The effects of subject attrition in a cohort design as a function of the number of subjects per cluster-period and for four combinations of values of the correlation coefficients. $η$ is the within-cluster between-period correlation, $ρ$ is the within-cluster within-period correlation, and $ξ$ is the within-cluster within-subject correlation. The legend in the upper left panel holds for all panels.