Calculate Kappa by Hand
Introduction & Importance
Kappa (κ) is a statistical measure that quantifies inter-rater reliability for qualitative (categorical) items. It’s crucial in fields like medicine, psychology, and social sciences to ensure consistency among raters.
How to Use This Calculator
- Enter the observed proportion of agreement (Po) and the expected proportion of agreement (Pe).
- Click ‘Calculate’.
- View your results and chart below.
Formula & Methodology
Kappa is calculated as:
κ = (Po – Pe) / (1 – Pe)
Real-World Examples
Data & Statistics
| Kappa (κ) | Strength of Agreement |
|---|---|
| 0.00 | No agreement |
| 0.00-0.20 | Slight agreement |
Expert Tips
- Always ensure your raters are well-trained and calibrated.
- Use this calculator to monitor and improve inter-rater reliability.
Interactive FAQ
What is Po?
The observed proportion of agreement among raters.
For more information, see the CDC’s glossary of health terms and the Cohen’s Kappa article.