Sample Size & Power Calculations
"How many participants do you need?" should never be a guess. Learn to justify your sample size with confidence, and write the paragraph reviewers actually accept.
Track Description
Turn the most dreaded section of any protocol into one you can defend. This course builds the intuition behind power, alpha, beta and effect size, then walks you through sizing descriptive studies, two-group comparisons, cohort and case-control designs, and trials, with hands-on demos in free online calculators. You finish with a protocol-ready sample-size paragraph, and the judgement to know when to call a biostatistician.
Courses in this track
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1
Understanding Sample Size, Power and Effect Size
Answer "How many participants do you need?" with confidence instead of a guess. This level is Level 1 of the "Sample Size & Power Calculations" course from ECORM pathway
7 chapters
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2
Sample Size for Descriptive Studies
A calculator is only as smart as the design you feed it. Learn to pick it, then size your first real study. This is Level 2 of the "Sample Size & Power Calculations" course from ECORM pathway.
7 chapters
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3
Sample Size for Comparing Two Groups
The most common calculation in health research: how many do you need to detect a real difference between two groups? This is Level 3 of the "Sample Size & Power Calculations" course from ECORM Pathway
5 chapters
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4
Sample Size for Cohort, Case-Control and Clustered Studies
Size the designs that don't fit a simple two-group mould, and see why clustering quietly demands more people. This is Level 4 of the "Sample Size & Power Calculations" course from ECORM Pathway.
6 chapters
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5
Sample Size for Trials and Writing the Protocol Section
Size a trial, write a sample-size section a reviewer will accept, and know when to call a biostatistician. This page is Level 5 of the "Sample Size & Power Calculations" course from ECORM Pathway.
5 chapters