Sample Size Calculators
Plan precision and power across common medical and health-research designs.
Explore resourcePublic health · biostatistics · research methods
Research planning,
taught clearly.
Transparent tools and structured academic resources for health and medical research—from the first question to a defensible analysis plan.
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Tools and learning, in one catalogue
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Sampling Generator
Generate reproducible simple, systematic, stratified, or cluster samples.
Explore resourceDiagnostic Test Accuracy
Summarise binary diagnostic classification with intervals and careful interpretation.
Explore resourceBiostatistics Learning Hub
Clinically oriented lessons from foundations through modelling and appraisal.
Explore resourceResearch Methodology
A guided curriculum for questions, designs, sampling, ethics, and reporting.
Explore resourceReliability & Agreement
Connect study-design guidance with ICC, kappa, alpha, and agreement tools.
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Light reading surface
Designed for sustained academic reading
The catalogue shell gives way to a calm, high-contrast article canvas for lessons, tables, formulae, and references.
Biostatistics · Foundations
From a clinical question to a statistical plan
A sound analysis begins before any statistical test is selected. The study objective, outcome type, sampling structure, and intended interpretation should determine the method.
Start with the estimand
State precisely what quantity the study should estimate or compare. This keeps the design, analysis, and reporting aligned with the clinical question.
Planning principle
Choose the analysis from the research question and data structure—not from whichever test is most familiar.
Then identify the data structure
Independent observations, repeated measurements, clustering, censoring, and paired data each require different assumptions and methods.
Focused tool surface
Calculators stay clear and task-oriented
Inputs and results retain a light workspace while using the same restrained borders, type scale, and teal accent system.
InputsEstimate a proportion
Theme boundaries
What this concept would—and would not—change
A restrained visual refresh should improve discovery and hierarchy without weakening the site’s academic purpose.
Catalogue-style discovery
Search, filters, image-like previews, strong category labels, and consistent resource cards.
Academic reading comfort
Light article canvases, generous line height, accessible tables, print styles, and clear references.
Statistical integrity
No formula, assumption, validation, rounding, or calculator logic changes are part of the theme.