Kappa Calculator
Introduction & Importance
Kappa (κ) is a statistical measure that quantifies inter-rater reliability for qualitative (categorical) items. It’s crucial in data analysis, psychology, medicine, and other fields to assess the degree of agreement between raters.
How to Use This Calculator
- Enter the nominal value (number of categories).
- Enter the observed agreement (proportion of agreements).
- Enter the expected agreement (proportion expected by chance).
- Click “Calculate”.
Formula & Methodology
Kappa is calculated as:
κ = (Observed – Expected) / (1 – Expected)
Real-World Examples
Data & Statistics
| Kappa Value | Interpretation |
|---|---|
| 0.00 – 0.20 | Slight agreement |
Expert Tips
- Kappa is not suitable for ordinal data.
- It’s sensitive to the prevalence and bias of raters.
- Use weighted kappa for ordinal data.
Interactive FAQ
What is the difference between Kappa and Pearson’s r?
Kappa is for categorical data, while Pearson’s r is for continuous data.