February, 2003
© 2000, 2001, 2003 Scott S. Emerson, M.D., Ph.D.
Frequentist Methods 1: 76
Example
Power: Alternative sampling density tail beyond crit value
O’Brien-Fleming stopping rule: variance 26.02, max N 100
·Mean 0.00: Prob that sample mean > 1.023 is 0.025
·Mean 1.43: Prob that sample mean > 1.023 is 0.785
·Mean 2.00: Prob that sample mean > 1.023 is 0.970
Pocock stopping rule: variance 26.02, max N 100
·Mean 0.00: Prob that sample mean > 1.187 is 0.025
·Mean 1.43: Prob that sample mean > 1.187 is 0.670
·Mean 2.00: Prob that sample mean > 1.187 is 0.922