The impact that group sequential tests would have made on ECOG clinical trials

1989 ◽  
Vol 8 (4) ◽  
pp. 505-516 ◽  
Author(s):  
Gary L. Rosner ◽  
Anastasios A. Tsiatis
Biometrika ◽  
1992 ◽  
Vol 79 (1) ◽  
pp. 13-24 ◽  
Author(s):  
JOHN D. EALES ◽  
CHRISTOPHER JENNISON

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