Nine planning calculators for clinical research, each with its formula, its primary source, and its limits stated plainly. Built by an epidemiologist; the means calculators use the exact noncentral t distribution, validated against R.
The number is the easy part. A reviewer will also want the design, the analysis that matches it, the confounders, the missing-data plan, and the justification in writing. MedStatica generates that full statistical plan from a plain-language description of your study — the first plans are free. Eighteen more analysis calculators (chi-square, t-tests, Kaplan–Meier, kappa, Bland–Altman…) live in the free app under Tests.
Plan my study free →See also: how plans are produced and validated · plans & pricing