CLIO Learning Modules
Study DesignSelectionSample SizeData Collection and AnalysisHuman Subjects
Case-Control/Nested Case-ControlProspective Cohort/Retrospective Cohort/Randomized Controlled Trial
Sample Size
At the end of this section, you should be able to:
  • Estimate sample size needed to reject a null hypothesis (given study design).
  • Reduce exposure and outcome to specific, measurable quantities.
  • Identify measure of association commonly associated with study design.
  • Evaluate enrollment and completion feasibility.
  • Recalibrate if possible (restrict eligibility, change measures).

June 4, 2004 v0.20
Copyright © 2004 Stanford School of Medicine