Sample size calculation for repeated measures design | |
---|---|
Standard deviation (drawn from literature review) | 7.64 |
Estimated minimal important difference (effect size) | 2 |
Target power (1-β error probability) | .80 |
Target alpha | .05 |
Estimated required size per treatment arm | 32 |
Estimated minimum sample size for two arms | 64 |
Target recruitment size (accounting for 30% attrition) | 80 |