r Power Analysis Sample Size Calculator for Regression
r power analysis sample size regression is a statistical method used to determine the sample size required for a regression analysis to have a certain level of power. It’s crucial for ensuring your study has enough participants to detect an effect if one exists.
How to Use This Calculator
- Enter the desired significance level (α), power (1 – β), and effect size (r).
- Click ‘Calculate’.
- View the results below the calculator.
Formula & Methodology
The formula used in this calculator is based on Cohen’s power analysis for multiple regression…
Real-World Examples
Data & Statistics
| Significance Level (α) | Power (1 – β) | Effect Size (r) | Sample Size |
|---|
Expert Tips
- Always use the latest version of the calculator for the most accurate results.
- Consider using a power analysis before starting your study to ensure you have enough participants.
Interactive FAQ
What is the default significance level?
The default significance level is 0.05.
For more information, see the UK Statistics Authority and the Centers for Disease Control and Prevention.