February, 2003
© 2000, 2001, 2003 Scott S. Emerson, M.D., Ph.D.
Frequentist Methods 1: 88
Example
Power: Alternative sampling density tail beyond crit value
O’Brien-Fleming stopping rule: variance 26.02, max N 104
·Mean 0.00: Prob that sample mean > 1.003 is 0.025
·Mean 1.43: Prob that sample mean > 1.003 is 0.8001
·Mean 2.00: Prob that sample mean > 1.003 is 0.975
Pocock stopping rule: variance 26.02, max N 135
·Mean 0.00: Prob that sample mean > 1.021 is 0.025
·Mean 1.43: Prob that sample mean > 1.021 is 0.801
·Mean 2.00: Prob that sample mean > 1.021 is 0.975