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. 2017 Jun 27;14(5):507–517. doi: 10.1177/1740774517716937

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© The Author(s) 2017

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

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Figure 4. — The expected sample size curves of several sequential SW-CRT designs with different possible allowed reasons for early stopping are displayed for Scenario 1. Each design has $T = {2, 3, 4, 5}$ , with $γ_{e} = γ_{f} = 0.5$ when required.