Sample Size Calculation
A defensible sample size with the formula, assumptions and references shown.
We calculate your sample size using the correct approach for your design and primary outcome — proportions, means, correlation, comparison of groups, diagnostic accuracy or survival — using assumptions drawn from published studies, and write it up ready for your synopsis.
What's included
- Selection of the appropriate formula or software (G*Power, OpenEpi, R)
- Assumptions justified with references from prior studies
- Adjustment for non-response, drop-out and design effect
- Write-up paragraph for your synopsis or protocol
What you receive
- Sample size justification (Word)
- Calculation output / screenshots for your records
How we work on this
After you submit an inquiry, a coordinator reviews your requirements and sends a written quotation. Once you approve it and pay the advance, the right expert takes it on, and it goes through technical, formatting, grammar and final quality checks before delivery. See the full workflow.
Ready to start? Get a quote for Sample Size Calculation
Share a few details and verify your email — a coordinator will review your scope and send a written quotation, usually within one working day.