Free research tools
Practical planning aids for rigorous research.
Use these tools for initial methodological planning, then record assumptions and obtain discipline-specific review before committing a protocol or analysis plan.
Transparent scopeEducational planning aids—not IRB approval, clinical advice or a substitute for statistical review.
Free tool
Sample Size Calculator
Estimate sample size for proportions, means and two-group comparisons.Open toolFree tool
Protocol Checklist
Score protocol completeness across design, ethics, data and analysis domains.Open toolFree tool
Statistical Test Selector
Identify candidate tests from the outcome scale, group structure and assumptions.Open toolFree tool
Reporting Guideline Finder
Match common study designs to established reporting guidelines and extensions.Open toolResponsible use
Document assumptions, not just answers.
Research decisions depend on the estimand, design, sampling frame, missing-data process, measurement quality, multiplicity and domain constraints. Save the inputs used, review them with the study team and revise the calculation or method when the protocol changes.