February, 2003
© 2000, 2001  Scott S. Emerson, M.D., Ph.D.
Session 2: 118
Comparison of Parameterizations
General comments
Families also defined for other boundary scales
·Partial sum and Z statistic scale families implemented in S+SeqTrial
·Bayesian and Futility scale families under construction
If stopping rules are carefully evaluated, it does not matter too much which scale (and therefore family) is used to derive the stopping rule.