February, 2003
© 2000, 2001  Scott S. Emerson, M.D., Ph.D.
Session 2: 65
Stopping Rules
Boundary shape functions
Pj measures the proportion of information accrued at the j-th analysis
·often Pj = Nj / NJ
·
Boundary shape function f(Pj)  is a monotonic function used to relate the dependence of boundaries at successive analyses on the information accrued to the study at that analysis