February, 2003
© 2000, 2001, 2003 Scott S. Emerson, M.D., Ph.D.
Frequentist Methods 1: 8
Statistical Issues
The statistical power associated with a test design is found by integrating the sampling density under particular alternative hypotheses.
Statistical power (1 - type II error) is the probability of observing a test statistic (estimate of treatment effect) more extreme than the critical value when the alternative hypothesis is true.
·Varies with the particular alternative
·In a two-sided test we consider one-sided power
-lower power and/or
-upper power