February, 2003
© 2000, 2001
Scott S. Emerson, M.D., Ph.D.
Group Sequential
Stopping Rules
Need for Monitoring
a Trial
Criteria for Early
Stopping
Inadequacy of Fixed
Sample Methods
Stopping Rules
Families of
Designs
Boundary Scales
Unified Family
(Sample Mean Scale)
Error Spending
Family
Comparison of
Parameterizations
Evaluation of Group
Sequential Designs