Kappa Index Calculator
Calculate Cohen's Kappa for inter-rater reliability with advanced statistical analysis
Understanding Cohen's Kappa
Cohen's Kappa (κ) measures the agreement between two raters, correcting for chance agreement. It ranges from -1 (complete disagreement) to +1 (perfect agreement).
Poor (κ < 0)
Slight (0.0 - 0.2)
Fair (0.21 - 0.4)
Moderate (0.41 - 0.6)
Substantial (0.61 - 0.8)
Almost Perfect (0.81 - 1.0)
Confusion Matrix
Enter the counts for each combination of ratings:
Import Data
Kappa Analysis Results
κ
Cohen's Kappa
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P₀
Observed Agreement
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Pₑ
Expected Agreement
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CI
95% Confidence Interval
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p
P-value
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SE
Standard Error
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Interpretation
Enter data to calculate Kappa
Observed vs Expected Agreement
Category-wise Agreement
Error Analysis
Which categories show the most disagreement?
Inter-Rater Reliability Tips
Training
Ensure all raters receive proper training on the classification criteria.
Clear Guidelines
Provide explicit, unambiguous guidelines for each category.
Practice Sessions
Conduct practice rating sessions with discussion of discrepancies.
Regular Checks
Periodically reassess reliability, especially for long-term studies.
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