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Sample-size calculator
Estimate a recruitment target for a simple proportion, then account for finite populations, design effect and non-response.
Open calculator ↗FREE · PRACTICAL · METHODS-FIRST
Tools that clarify
the next research decision.
Use these three tools to prepare—not to replace statistical judgement. Each result states its inputs, assumptions and limits, then gives you a route to qualified support when the design is more complex.
RUNS ON YOUR DEVICE
Data-quality checker
Inspect an anonymised CSV, TSV or Excel file for missingness, duplicate rows, empty fields and structural risks without uploading it.
Check a dataset ↗METHODS-FIRST
Analysis planner
Map an objective, outcome, predictors and study design to a candidate method, assumptions, alternatives and interpretation limits.
Plan an analysis ↗