Hypothesis test
Sequential Analysis (Group Sequential Design)
Sequential analysis is a framework for conducting hypothesis tests with pre-planned interim looks at accumulating data, allowing a study to stop early for efficacy or futility while controlling the overall Type I error rate. The group sequential approach was formalised by Pocock (1977) and O'Brien and Fleming (1979), and remains the standard for confirmatory clinical trials and rigorous A/B experiments.
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Sources
- O'Brien, P.C. & Fleming, T.R. (1979). A Multiple Testing Procedure for Clinical Trials. Biometrics, 35(3), 549–556. DOI: 10.2307/2530245 ↗
- Jennison, C. & Turnbull, B.W. (1999). Group Sequential Methods with Applications to Clinical Trials. CRC Press. ISBN: 978-0849303166