# BioStat Lab

> Sample Size & Power Calculator

Canonical page: [https://chrome-stats.com/d/id6784252840](https://chrome-stats.com/d/id6784252840)

## Overview

- **ID:** `id6784252840`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** 长贵 周
- **Category:** Medical
- **Version:** 1.0
- **Last updated:** 2026-07-01
- **First published:** 2026-06-30
- **Size:** 2.46 MB
- **Data as of:** 2026-09-23
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/biostat-lab/id6784252840)
- **Website:** [https://aikoi.xyz/biostat-lab](https://aikoi.xyz/biostat-lab)
- **Privacy policy:** [https://aikoi.xyz/biostat-lab/privacy](https://aikoi.xyz/biostat-lab/privacy)

## Description

Sample size & power for t-test, ANOVA, proportions, correlation, and survival. All offline. No account needed. Built for biomedical research.

BioStat Lab is a precise, offline statistical power and sample size calculator designed for biomedical researchers, clinicians, and students.

CALCULATORS INCLUDED

t-Test — Independent & Paired
Calculate the required sample size for independent-samples or paired t-tests. Enter mean difference, standard deviation, significance level (α), and desired power (1−β).

ANOVA — One-Way
Determine per-group and total sample size for a one-way ANOVA across 2–20 groups. Uses Bonferroni-adjusted alpha for multiple-comparison control.

Proportions — Two-Proportion z-Test
Compare two event rates or response proportions. Displays absolute difference and risk ratio alongside the required sample size per group.

Correlation — Pearson r
Sample size for testing whether a Pearson correlation is significantly different from zero. Uses Fisher z-transformation for accuracy. Includes Cohen's effect-size classification.

Survival — Log-Rank Test
Event-driven sample size for survival studies using Freedman's formula. Enter hazard ratio, expected event rate, α, and power to get required events and total subjects.

DESIGN PHILOSOPHY
Dark space-inspired interface — deep indigo background, violet accent readouts, monospaced numeric displays — optimized for focused scientific work.

PRIVACY
No account required. No data collected. All calculations happen on-device.

## Rankings

- #1,367,754 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6784252840)