Study PlanningFree

Power Analysis Planner

Calculate sample sizes and statistical power for any psychology study design

power analysis sample size G*Power effect size

Free

612 researchers installed this

5.0(2)

About this skill

What it does

Walks you through a complete power analysis for your study, helping you justify your sample size to reviewers and IRBs.

Supported Designs

Between-subjects (independent samples t-test, one-way ANOVA)
Within-subjects (paired t-test, repeated measures ANOVA)
Factorial designs (interaction effects, simple effects)
Regression (single and multiple predictors)
Correlation studies
Mediation/moderation (PROCESS macro approach)

What you get

Effect size selection prompts (with Cohen conventions + field norms)
G*Power walkthrough for any analysis type
Sensitivity analysis for when sample size is fixed
IRB-ready justification paragraph
Sample size table for multiple power levels

How to use

Describe your study design to the AI and follow the guided prompts. Outputs G*Power settings you can screenshot for your methods section.

What researchers say

5.0(2)

刘浩华南师大应用心理学博士生 · SCNU Applied Psychology PhD

功效分析一直是困扰我的难题。这个技能根据我的2×3被试间ANOVA设计直接给出了样本量建议和G*Power操作步骤，完美解决了开题报告里的方法论弱点，导师当场批准了我的方案。

Li WeiEducation Master's student, PKU

Saved my thesis proposal. My committee kept questioning my sample size justification, and this skill helped me run a proper power analysis for my mixed ANOVA design and write it up clearly. Committee approved the proposal in one round.