Group Sequential Tests and Variance Heterogeneity in Clinical Trials

Author(s):  
Keumhee Chough ◽  
Abdulkadir Hussein ◽  
Taesung Park
Biometrika ◽  
1992 ◽  
Vol 79 (1) ◽  
pp. 13-24 ◽  
Author(s):  
JOHN D. EALES ◽  
CHRISTOPHER JENNISON

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