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Group sequential methods for clinical trials with a one-sided hypothesis Get access DAVID L. DEMETS, DAVID L. DEMETS Search for other works by this author on: Oxford Academic Google Scholar JAMES H. WARE JAMES H. WARE Search for other works by this author on: Oxford Academic Google Scholar Biometrika, Volume 67, Issue 3, 1980, Pages 651–660, https://doi.org/10.1093/biomet/67.3.651 Published: 01 December 1980 Article history Received: 01 August 1979 Revision received: 01 April 1980 Published: 01 December 1980
DeMets et al. (Tue,) studied this question.