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It provides functions to design historical controlled trials with survival outcome by group sequential method. The options for interim look boundaries are efficacy only, efficacy & futility or futility only. It also provides the function to monitor the trial for any unplanned look. The package is based on Jianrong Wu, Xiaoping Xiong (2016) doi:10.1002/pst.1756 and Jianrong Wu, Yimei Li (2020) doi:10.1080/10543406.2019.1684305.
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