February, 2003
© 2000, 2001 Scott S. Emerson, M.D., Ph.D.
Session 3: 11
Schedule of Analyses
Example: Stopping rule chosen at design (cont.)
One-sided test of a greater alternative:
Null : Theta <= 0      (size  = 0.025)
Alt  : Theta >= 0.5    (power = 0.975)
(Emerson & Fleming (1989) symmetric test)
STOPPING BOUNDARIES: Sample Mean scale
                            a      d
    Time 1 (N=  86.31) 0.0000 0.5000
    Time 2 (N= 172.62) 0.1464 0.3536
    Time 3 (N= 258.92) 0.2113 0.2887
    Time 4 (N= 345.23) 0.2500 0.2500