Statistical Power - People.stat.sfu.ca

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• Alternative to Retrospective Power Analysis:  Provide range of effect sizes! • Confidence Intervals provide information about  the true size of an effect instead of just  “statistically different from 0”! • The same factors that reduce power (high α,  low sample size, high sample variability) also  increase the width of confidence intervals.! Confidence Intervals and Power
Confidence Intervals and Power
Page 1 and 2: STATISTICAL POWER ANALYSIS IN WILDL
Page 3 and 4: !Interrelated components: target po
Page 5 and 6: !Effect: magnitude of response, ori
Page 7 and 8: • Set a meaningful effect size,
Page 9 and 10: Typical constraints:! • Maximum n
Page 11 and 12: • Change to crossover (paired) de
Page 13: Power is calculated using sample si
Page 17 and 18: Points To Remember:! • Hypothesis

Statistical Power - People.stat.sfu.ca

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