Free Biostatistics Resources & Tools
Plan your study, organize your data, and write a clearer report with free tools, practical guides, and downloadable worksheets.
Choose a research stage to find matching guides and downloads. For interactive calculators and planning aids, browse the Research Workbench. For questions to investigate, read the research briefs.
Start with These Resources
Sample-Size Planning Calculator
Offline planning approximations for independent means or proportions and one-sample comparisons with a fixed reference. Includes alpha, power, allocation ratio and expected loss; excludes crossover and non-inferiority designs.
Statistical Analysis Plan (SAP) Template
An editable drafting template with study-specific prompts for estimands, analyses, missing data, and reporting. Requires completion and statistical review before use.
CONSORT Checklist for RCTs
The CONSORT 2025 checklist for reporting randomized trials. Use alongside the full statement, applicable extensions, and your journal’s instructions.
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Sample-Size Planning Calculator
Offline planning approximations for independent means or proportions and one-sample comparisons with a fixed reference. Includes alpha, power, allocation ratio and expected loss; excludes crossover and non-inferiority designs.
Statistical Analysis Plan (SAP) Template
An editable drafting template with study-specific prompts for estimands, analyses, missing data, and reporting. Requires completion and statistical review before use.
CONSORT Checklist for RCTs
The CONSORT 2025 checklist for reporting randomized trials. Use alongside the full statement, applicable extensions, and your journal’s instructions.
ACS statistical testing spreadsheet
Compare published estimates with their margins of error using the Bureau’s downloadable workbook. The workbook is free; a compatible spreadsheet application is required. Public Census Bureau resource; no account or paid subscription required.
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Visit official resourceACS variance replicate tables
Download aligned replicate estimates to propagate uncertainty when combining selected five-year detailed tables. Coverage is limited to the tables and geographies in the release list. Public Census Bureau resource; no account or paid subscription required.
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Visit official resource2025 ACS comparison guidance
Check year-specific cautions before comparing income, population controls or changed questionnaire items with another release. Public Census Bureau resource; no account or paid subscription required.
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Visit official resourceACS table shells and universes
Identify the population covered by a table and inspect its hierarchy before selecting rows for a numerator or denominator. Public Census Bureau resource; no account or paid subscription required.
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Visit official resourceACS table-based summary files
Obtain estimates and margins by table and join the supplied geography labels for a reproducible bulk extract. Public Census Bureau resource; no account or paid subscription required.
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Visit official resourceACS user notes by data collection year
Check methodological exceptions that affect particular years, products and estimates before finalizing study limitations. Public Census Bureau resource; no account or paid subscription required.
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Visit official resourceACS errata notices
Check whether a published correction affects the variables in an archived analysis and record the replacement release. Public Census Bureau resource; no account or paid subscription required.
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Visit official resourceACS geographic boundaries by year
Identify which boundary vintage a release uses before comparing areas or attaching contextual indicators. Public Census Bureau resource; no account or paid subscription required.
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Visit official resourceChoosing ACS one-year or five-year estimates
Compare period length, population coverage and precision when selecting an estimate for a research question. Public Census Bureau resource; no account or paid subscription required.
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Visit official resourceExternal resources are maintained by their respective providers. Source-check dates are shown on external-resource entries; features and optional paid services may change. Our worksheets are planning aids, not validated instruments.