A Practical Simulation Method to Calculate Sample Size of Group Sequential Trials for Time-to-Event Data under Exponential and Weibull Distribution

• Zhiwei Jiang,

  Affiliation Department of Health Statistics and the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, School of Preventative Medicine, Fourth Military Medical University, Xi'an, Shaanxi, China

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• Ling Wang,

  Affiliation Department of Health Statistics and the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, School of Preventative Medicine, Fourth Military Medical University, Xi'an, Shaanxi, China

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• Chanjuan Li ,

  * E-mail: chanjuan_li@sohu.com (CL); jielaixia@yahoo.com (JX)

  Affiliation Department of Health Statistics and the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, School of Preventative Medicine, Fourth Military Medical University, Xi'an, Shaanxi, China

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• Jielai Xia ,

  * E-mail: chanjuan_li@sohu.com (CL); jielaixia@yahoo.com (JX)

  Affiliation Department of Health Statistics and the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, School of Preventative Medicine, Fourth Military Medical University, Xi'an, Shaanxi, China

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• Hongxia Jia

  Affiliation Department of Endocrinology, Jinan General Hospital, Jinan, Shandong, China

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