Krippendorff's Alpha
Krippendorff's alpha is a chance-corrected coefficient that quantifies the reliability of coding decisions made by two or more observers, and is the standard reliability statistic in communication content analysis. Unlike percent agreement, it corrects for the agreement expected by chance; unlike Cohen's kappa, it generalizes seamlessly to any number of coders, any measurement level (nominal, ordinal, interval, ratio), and data sets with missing values.
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Sources
- Hayes, A. F., & Krippendorff, K. (2007). Answering the call for a standard reliability measure for coding data. Communication Methods and Measures, 1(1), 77–89. DOI: 10.1080/19312450709336664 ↗
- Krippendorff, K. (2004). Content Analysis: An Introduction to Its Methodology (2nd ed.). Thousand Oaks, CA: Sage. ISBN: 9780761915454
- Cohen, J. (1960). A coefficient of agreement for nominal scales. Educational and Psychological Measurement, 20(1), 37–46. DOI: 10.1177/001316446002000104 ↗
How to cite this page
ScholarGate. (2026, June 22). Krippendorff's Alpha Reliability Coefficient. ScholarGate. https://scholargate.app/en/communication/krippendorff-alpha
Which method?
Set this method beside its closest kin and read them side by side — the library lays the books on the table; the choice is yours.
- Content AnalysisQualitative↔ compare
- Framing AnalysisCommunication↔ compare
- Intercoder ReliabilityCommunication↔ compare
- Manifest Content AnalysisCommunication↔ compare