February, 2003
© 2000, 2001  Scott S. Emerson, M.D., Ph.D.
Session 2: 63
Stopping Rules
Number and timing of analyses
N counts the sampling units accrued to the study
Up to J analyses of the data to be performed
Analyses performed after accruing sample sizes of N1 < N2 < L < NJ
(More generally, N measures statistical information)