A sample-size justification reviewers cannot pick apart.
Sample size & power calculation
What you get, and how it runs.
The calculation, the assumptions behind it, and where each assumption came from, written so that an ethics committee, a grant reviewer, or a journal referee can follow and reproduce it. Delivered with the code, so it can be re-run if the design changes.
How it works
- You tell us the primary outcome, the comparison, and the design.
- We source the effect size and variability from the literature or your pilot data, and state the choice.
- We calculate the required sample, with sensitivity to the key assumptions and allowance for dropout or clustering.
- You receive the written justification paragraph, ready to paste into the protocol or grant.
What you get
- Sample-size / power calculation with sensitivity table
- Written justification paragraph with references
- Reproducible R or Stata code
- Guidance if the achievable sample falls short
$350 per project · typically 3 to 5 working days
Request a calculationHow single-task work runs
Four steps from enquiry to delivery.
01
Send what you have
Dataset, draft, idea, or rejection letter
02
Scope
What the stage needs, within two working days
03
Fixed quote
Scope, timeline, fee in writing
04
Delivery
Deliverable, code, handover note
Test the fit at no cost
Send your area of interest, one idea, or one stalled dataset.
You get a short feasibility note, design, expected sample, realistic journals, free of charge.