Inter-Coder Agreement for Computational Linguistics
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This article is a survey of methods for measuring agreement among corpus annotators. It exposes the mathematics and underlying assumptions of agreement coefficients, covering Krippendorff's alpha as well as Scott's pi and Cohen's kappa; discusses the use of coefficients in several annotation tasks; and argues that weighted, alpha-like coefficients, traditionally less used than kappa-like measures in computational linguistics, may be more appropriate for many corpus annotation tasks—but that their use makes the interpretation of the value of the coefficient even harder.
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Artstein and Poesio (2008) discussed several drawbacks when metrics without chance-correction like accuracy and correlation.
“Artstein and Poesio (2008) discussed several drawbacks when metrics without chance-correction like accuracy and correlation.”
From Rating Roulette: Self-Inconsistency in LLM-As-A-Judge Frameworks (2025) · cites this paper as Artstein and Poesio, 2008
Section 2.3, “Agreement Without Chance Correction,” discusses two drawbacks of percentage agreement: it varies with the number of categories and can be misleading when categories are unevenly distributed. Section 3.2 also explains why high accuracy can coexist with unreliable coding. The paper does not discuss the drawbacks of correlation coefficients here; a note in Section 5.3 says that discussion is in an extended version. (LLM, conf=0.86)
Experimental — accuracy not yet measuredA weighted version of the multi-coders κ statistics is still missing.
“This weighted generalization restricts however to a two coders scheme (Artstein and Poesio, 2008): a weighted version of the multi-coders κ statistics is still missing.”
From Weighted Krippendorff's alpha is a more reliable metrics for multi-coders ordinal annotations: experimental studies on emotion, opinion and coreference annotation (2014) · cites this paper as Artstein and Poesio, 2008
Section 2.6.2 describes weighted Cohen’s κ using two coders, supporting the first part of the citing sentence. But the paper does not say that a weighted multi-coder κ is missing; Section 3.1 discusses a weighted, individual-coder-distribution variant used in a study with 18 subjects. The claimed absence is therefore not supported by this source. (LLM, conf=0.82)
Experimental — accuracy not yet measuredKrippendorff's α and Cohen's weighted κ are the standard panel-level inter-rater stability metrics for ordinal scoring.
“Krippendorff's α [Krippendorff, 2011] and Cohen's weighted κ are the standard panel-level inter-rater stability metrics for ordinal scoring”
From A Two-Phase Stability Study of LLM Judges and Bar Council Examiners on Thai Bar-Exam Free-Form Essays (2026) · cites this paper as Artstein and Poesio, 2008
Section 2.6 describes both α and weighted κ as measures that can account for different magnitudes of disagreement, and §2.6.1 says α applies to multiple coders. But the paper says weighted κ is defined for two coders, so it does not support calling both measures panel-level metrics. Section 5.2 also recommends α, rather than establishing both as standard for ordinal scoring; page numbers were not available in our copy. (LLM, conf=0.88)
Experimental — accuracy not yet measuredMetrics without chance-correction cannot be compared across studies because some of the agreement will be due to chance, and that chance is affected by factors that vary from one study to another.
“Despite being intuitive to understand, their values cannot be compared across studies, because some of the agreement will be due to chance, and that chance is affected by factors that vary from one study to another.”
From Rating Roulette: Self-Inconsistency in LLM-As-A-Judge Frameworks (2025) · cites this paper as Artstein and Poesio, 2008
Agreements among annotators were moderate for economic, substantial for foreign, and fair for social.
“The agreements among annotators for the economic and foreign dimensions are moderate & substantial (Artstein and Poesio, 2008), respectively; for social, the 'fair' agreement was noticed during annotation, and additional discussion for each paragraph was then held.”
From Political Ideology and Polarization: A Multi-dimensional Approach (2022) · cites this paper as Artstein and Poesio, 2008
The citation is attached to the economic and foreign agreement ratings; the citing sentence presents the social rating as its own observation. Section 5.3 discusses how to interpret agreement coefficients but gives no ratings for economic or foreign annotations. Searches for those dimensions and for “moderate” and “substantial” found no supporting passage in our copy. (LLM, conf=0.73)
Experimental — accuracy not yet measured
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The self-check needs the paper’s full text.
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“judges are also reflected in low Inter-Annotator Agreement (IAA), where adequate thresholds also tend to be open to interpretation (Artstein and Poesio, 2008).”
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“Arstein and Poesio (2005) have shown that the greater the number of coders is, the lower the annotator bias decreases.”
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“The agreements among annotators for the economic and foreign dimensions are moderate & substantial (Artstein and Poesio, 2008), respectively; for social, the ‘fair’ agreement was noticed during annotation, and additional discussion for each paragraph was then held.”
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“Artstein and Poesio (2008) discussed several drawbacks when metrics without chance-correction like accuracy and correlation.”
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Akarajaradwong, P., Lertprasertphakorn, W., Chaksangchaichot, C., & Nutanong, S. (2026) · arXiv · doi:10.48550/arxiv.2605.25652
“…assumption is that the panel agreement among credentialed human experts defines a single stability ceiling, and that an LLM judge has succeeded when its agreement against that panel approaches that ceiling [Zheng et al., 2023, Liu et al., 2023, Thakur et al., 2025, Artstein and Poesio, 2008].”
- Authors
- Artstein, R., & Poesio, M.
- Affiliations
- University of Essex (GB)
- Corresponding author
- Artstein, Ron
- Poesio, Massimo
- Venue
- Computational Linguistics
- Publisher
- MIT Press
- Published
- 2008-12
- Volume
- 34
- Issue
- 4
- Pages
- 555-596
- ISSN
- 0891-2017 (ISSN-L)
- 1530-9312
- OpenAlex
- W2141766660
- Cited by
- 1,665
- References
- 8
- Citations by year
- 2026: 153 · 2025: 89 · 2024: 85 · 2023: 133 · 2022: 128 · 2021: 147 · 2020: 117 · 2019: 92 · 2018: 87 · 2017: 77 · 2016: 89 · 2015: 72 · 2014: 99 · 2013: 76 · 2012: 70
- FWCI
- 56.33
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Computational Linguistics (publishedVersion)
- Open Access at Essex (University of Essex) (acceptedVersion)
- Iris (University of Trento) (submittedVersion)
- Funders
- Engineering and Physical Sciences Research Council (GR/S76434/01)
- Topics
- Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Reliability and Agreement in Measurement
- Social Sciences › General Social Sciences › Computational and Text Analysis Methods
- Physical Sciences › Computer Science › Artificial Intelligence › Natural Language Processing Techniques
- Keywords
- inter-coder agreement, Krippendorff's alpha, Cohen's kappa, corpus annotation, inter-annotator reliability
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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