Intraclass Correlation Coefficient Calculator
Introduction & Importance
Intraclass correlation coefficient (ICC) is a measure of agreement among raters or reliability of a measure. It’s crucial in various fields, including psychology, medicine, and education, to ensure consistent and reliable assessments.
How to Use This Calculator
- Enter the number of raters (n) and the number of items (k).
- Enter the sum of squares (SS) and within-groups sum of squares (SSW).
- Click ‘Calculate’.
Formula & Methodology
The ICC formula is: ICC = (SS – (k – 1) * SSW) / (SS + (n – 1) * SSW).
Real-World Examples
Data & Statistics
| n | k | SS | SSW | ICC |
|---|---|---|---|---|
| 5 | 10 | 2500 | 150 | 0.85 |
| 3 | 8 | 1800 | 200 | 0.72 |
Expert Tips
- Ensure raters are trained and calibrated.
- Use ICC as a guide, not the sole determinant, for reliability.
Interactive FAQ
What if ICC is close to 1?
ICC close to 1 indicates high agreement among raters.