Calculate Sample Size for Mediation Analysis
What is Mediation Analysis and Why Calculate Sample Size?
Mediation analysis is a statistical method used to determine how a third variable, the mediator, affects the relationship between an independent variable and a dependent variable…
How to Use This Calculator
- Enter the desired sample size (n) in the first input field.
- Set the significance level (α) in the second input field. Common values are 0.05 or 0.01.
- Enter the desired power (1 – β) in the third input field. A common value is 0.8 or 0.9.
- Click the “Calculate” button.
Formula & Methodology
The sample size calculation for mediation analysis is based on the formula derived from power analysis…
Real-World Examples
Let’s consider three scenarios to illustrate the use of this calculator…
Data & Statistics
| Sample Size (n) | Power (1 – β) |
|---|---|
| 50 | 0.68 |
| 100 | 0.89 |
| 200 | 0.98 |
Expert Tips
- Always round up the calculated sample size to ensure sufficient power.
- Consider using a power analysis software for more complex scenarios.
Interactive FAQ
What is the difference between mediation and moderation?
Mediation and moderation are both statistical methods used to understand the relationship between variables, but they differ in their underlying assumptions and effects…
For more information on mediation analysis, see the following resources: Mediation Analysis: An Introduction and a Practical Guide (National Institutes of Health) Mediation Analysis in R (University of California, Los Angeles)