Calculator Suite

Professional statistical tools for experiment design

Free

Basic Calculators

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Bayesian Toolkit

Requires Pro

FDA-grade trial design. Follow the numbered steps.

1

Prior ElicitationNEW

Define interpretable Bayesian priors with ESS and credible bounds

Docs
2

Bayesian BorrowingNEW

Incorporate historical data with power prior, commensurate, or MAP

Requires Prior

Docs
3

Single-Arm SizeNEW

Sample size for single-arm trials with operating characteristics

Requires Prior

Docs
4

Two-Arm DesignNEW

Randomized treatment vs. control with superiority or NI testing

Requires Prior

Docs
5

Sequential MonitoringNEW

Bayesian posterior probability stopping rules for interim analyses

Requires Prior

Docs
6

Predictive Power

Estimate trial success probability given interim data

Requires Prior

Docs
Pro

Frequentist Tools

CUPED Calculator

Reduce sample size by 30-50% using pre-experiment data

Docs

Survival Sample SizeNEW

Log-rank power analysis with Schoenfeld/Freedman formulas

Docs

Group Sequential Design

Interim analyses with stopping boundaries (R-powered)

gsDesign 3.6 · R-powered

Docs

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Zetyra | Modern Statistical Design Tools for A/B Testing & Clinical Trials