February, 2003
© 2000, 2001 Scott S. Emerson, M.D., Ph.D.
Families of
group sequential stopping rules can be defined on a number of
scales
Parametric
family relates stopping boundaries at successive analyses
·Pj = proportion of maximal information available
at j-th analysis
·dj =
stopping boundary at j-th analysis for some statistic
·dj =
f(Pj)
is parametric boundary function