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. 2022 Mar 10;31(5):779–800. doi: 10.1177/09622802211053205

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© The Author(s) 2022

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Figure 9. — Out-of-control ARLs indicated on the logarithmic scale of one-sided RA CUSUM charts for five beta-binomial $(71, α, β)$ models and different levels of surgical performance $Q_{*}$ . The left panel shows results for detecting deterioration and the right panel for detecting improvement in surgical performance.