Sample Size Workshop

FREE ONLINE COURSE: Power and Sample Size for Multilevel and Longitudinal Study Designs

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Free Online Course with Flexible Deadlines

Coursera will be hosting a free instance of a 5 week online course starting January 13th. The course covers innovative, research-based power and sample size methods, and software for multilevel and longitudinal studies. Course development was partially funded by the National Institute of General Medical Sciences, a component of the National Institutes of Health. The goal of the course is to teach and disseminate methods for accurate sample size choice in multilevel and longitudinal studies.


  • Understand a framework and strategy for study planning
  • Write study aims as testable hypotheses
  • Describe a longitudinal and multilevel study design
  • Write a statistical analysis plan
  • Ensure sufficient sample size for racial or ethnic subgroups for studies of disparities
  • Demonstrate the feasibility of recruitment
  • Describe expected missing data and dropout
  • Write a power and sample size analysis that is aligned with the planned statistical analysis
  • Write the design, analysis, power and sample size sections for a grant


The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. Materials for the course were developed with support from NIH OBSSR and NIGMS via 1R25GM111901-01, “A Master Course on Power for Multilevel and Longitudinal Health Behavior Studies,” 08/25/2014-06/30/2020. Additional support was provided the University of Florida (UF) Clinical and Translational Science Institute and the UF Department of Health Outcomes and Biomedical Informatics.