Cited by 5,812Ethics and Social Impacts of AIExplainable Artificial Intelligence (XAI)Discrimination and Equality Law

A Survey on Bias and Fairness in Machine Learning

Open access
Mehrabi, Ninareh, Morstatter, Fred, Saxena, Nripsuta, Lerman, Kristina, Galstyan, Aram·2022·ACM Computing Surveys

Abstract

With the widespread use of artificial intelligence (AI) systems and applications in our everyday lives, accounting for fairness has gained significant importance in designing and engineering of such systems. AI systems can be used in many sensitive environments to make important and life-changing decisions; thus, it is crucial to ensure that these decisions do not reflect discriminatory behavior toward certain groups or populations. More recently some work has been developed in traditional machine learning and deep learning that address such challenges in different subdomains. With the commercialization of these systems, researchers are becoming more aware of the biases that these applications can contain and are attempting to address them. In this survey, we investigated different real-world applications that have shown biases in various ways, and we listed different sources of biases that can affect AI applications. We then created a taxonomy for fairness definitions that machine learning researchers have defined to avoid the existing bias in AI systems. In addition to that, we examined different domains and subdomains in AI showing what researchers have observed with regard to unfair outcomes in the state-of-the-art methods and ways they have tried to address them. There are still many future directions and solutions that can be taken to mitigate the problem of bias in AI systems. We are hoping that this survey will motivate researchers to tackle these issues in the near future by observing existing work in their respective fields.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1145/3457607

Cites

152 of 152 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • One technical way to address bias is to use machine learning tools that are trained to detect and highlight potential biases.

    “One technical way to address this issue is to use machine learning tools that are trained to detect and highlight potential biases (Mehrabi et al. 2019).”

    From Legitimacy of Algorithmic Decision-Making: Six Threats and the Need for a Calibrated Institutional Response (2022) · cites this paper as Mehrabi et al. 2019

    Section 2.2, “Assessment Tools” (page unavailable), describes toolkits that test models for bias and fairness across population subgroups and produce reports, supporting the use of tools to identify potential bias. It does not say those assessment tools are machine-learning tools trained to detect bias, so that specific description is unsupported. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • The effects of AI technologies on healthcare may vary significantly depending on patient demographics, underlying health conditions, and clinical environments.

    “While AI technologies hold immense potential to transform healthcare by providing personalized and efficient care, their effects may vary significantly depending on patient demographics, underlying health conditions, and clinical environments.82–85”

    From Artificial Intelligence in Outpatient Primary Care: A Scoping Review on Applications, Challenges, and Future Directions (2026) · cites this paper as [83]

    Section 3.2.2 says AI in healthcare has not affected all patients equally, and §3.1.1 describes how a diabetes model may be less suitable for some ethnic and gender groups. These passages support variation by patient demographics, but do not establish variation by underlying health conditions or clinical environments. Page numbers were not provided in our copy. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Different notions of fairness can be defined, including causal fairness which relies on causal relations and requires establishing causal graphs, or counterfactual fairness.

    “Different notions of fairness can be also defined [78,90], including causal fairness which relies on causal relations and requires establishing causal graphs - or counterfactual fairness.”

    From Connecting the dots in trustworthy Artificial Intelligence: From AI principles, ethics, and key requirements to responsible AI systems and regulation (2023) · cites this paper as [78]

    Section 4.1 presents multiple definitions of fairness, and Section 5.2.6 describes causal approaches that use causal relationships and graphs; it also mentions counterfactual fairness. The survey does not say that every causal approach to fairness requires establishing a causal graph, so the categorical requirement is not supported. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • Algorithmic bias in hiring is real and largely traceable to data and design rather than malice.

    “Taken together, this literature establishes two claims the remainder of the paper relies on: that algorithmic bias in hiring is real and largely traceable to data and design rather than malice, and that fixing it cannot be left to the technology alone.”

    From Rejected by Code: Algorithmic Bias in AI-Driven Recruitment and the Case for HR-IT Governance Frameworks (2026) · cites this paper as [11]

    Section 2.1 describes discriminatory delivery of STEM job ads despite a gender-neutral intention, and Section 3 explains how biased data and algorithm-design choices produce biased outcomes. These passages support bias in employment-related algorithms without malice, but they do not establish that hiring bias is largely attributable to data and design. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Training data used to train an LLM may be drawn from a nonrepresentative sample of the population, which can cause the model to fail to generalize well to some social groups.

    “Training Data: The data used to train an LLM may be drawn from a nonrepresentative sample of the population, which can cause the model to fail to generalize well to some social groups.”

    From Bias and Fairness in Large Language Models: A Survey (2024) · cites this paper as Mehrabi et al. 2021

    Section 3.1.1 (page not provided) says nonrepresentative samples can omit subgroups and that sampling bias can prevent learned trends from generalizing to a new population. This supports the proposed mechanism, but the passages discuss machine-learning models generally, not LLMs specifically or their performance for particular social groups. (LLM, conf=0.84)

    Experimental — accuracy not yet measured

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 20

  1. [1]1. Alekh Agarwal, Miroslav Dudik, and Zhiwei Steven Wu. 2019. Fair Regression: Quantitative Definitions and Reduction- Based Algorithms. In International Conference on Machine Learning. 120-129.
  2. [4]4. Nazanin Alipourfard, Peter G Fennell, and Kristina Lerman. 2018. Using Simpson's Paradox to Discover Interesting Patterns in Behavioral Data. In Twelfth International AAAI Conference on Web and Social Media.
  3. [16]16. Peter J Bickel, Eugene A Hammel, and J William O'Connell. 1975. Sex bias in graduate admissions: Data from Berkeley. Science 187, 4175 (1975), 398-404.
  4. [17]17. RDP Binns. 2018. Fairness in machine learning: Lessons from political philosophy. Journal of Machine Learning Research (2018).
  5. [28]28. Guyon, U. V. Luxburg, S. Bengio, H. Wallach, R. Fergus, S. Vishwanathan, and R. Garnett (Eds.). Curran Associates, Inc., 3992-4001. http://papers.nips.cc/paper/6988-optimized-pre-processing-for-discrimination-prevention.pdf
  6. [34]34. S. Chiappa and W. S. Isaac. 2019. A Causal Bayesian Networks Viewpoint on Fairness. In E. Kosta, J. Pierson, D. Slamanig, S. Fischer-Hübner, S. Krenn (eds) Privacy and Identity Management. Fairness, Accountability, and Transparency in the Age of Big Data. Privacy and Identity 2018. IFIP Advances in Information and Communication Technology, Vol. 547. Springer, Cham.
  7. [50]50. Cynthia Dwork, Nicole Immorlica, Adam Tauman Kalai, and Max Leiserson. 2018. Decoupled Classifiers for Group-Fair and Efficient Machine Learning. In Proceedings of the 1st Conference on Fairness, Accountability and Transparency (Proceedings of Machine Learning Research, Vol. 81), Sorelle A. Friedler and Christo Wilson (Eds.). PMLR, New York, NY, USA, 119-133. http://proceedings.mlr.press/v81/dwork18a.html
  8. [76]76. Faisal Kamiran and Toon Calders. 2010. Classification with no discrimination by preferential sampling. In Proc. 19th Machine Learning Conf. Belgium and The Netherlands. Citeseer, 1-6.
  9. [87]87. Ivan Krasin, Tom Duerig, Neil Alldrin, Vittorio Ferrari, Sami Abu-El-Haija, Alina Kuznetsova, Hassan Rom, Jasper Uijlings, Stefan Popov, Andreas Veit, et al. 2017. Openimages: A public dataset for large-scale multi-label and multi-class image classification. Dataset available from https://github. com/openimages 2, 3 (2017), 2-3.
  10. [89]89. Guyon, U. V. Luxburg, S. Bengio, H. Wallach, R. Fergus, S. Vishwanathan, and R. Garnett (Eds.). Curran Associates, Inc., 4066-4076. http://papers.nips.cc/paper/6995-counterfactual-fairness.pdf
  11. [91]91. J Larson, S Mattu, L Kirchner, and J Angwin. 2016. Compas analysis. GitHub, available at: https://github. com/propublica/compas-analysis[Google Scholar] (2016).
  12. [95]95. Kristina Lerman and Tad Hogg. 2014. Leveraging position bias to improve peer recommendation. PloS one 9, 6 (2014), e98914.
  13. [96]96. Zachary C Lipton, Alexandra Chouldechova, and Julian McAuley. 2017. Does mitigating ML's disparate impact require disparate treatment? stat 1050 (2017), 19.
  14. [97]97. Lydia T Liu, Sarah Dean, Esther Rolf, Max Simchowitz, and Moritz Hardt. 2018. Delayed Impact of Fair Machine Learning. In Proceedings of the 35th International Conference on Machine Learning.
  15. [99]99. Christos Louizos, Kevin Swersky, Yujia Li, Max Welling, and Richard Zemel. 2016. THE VARIATIONAL FAIR AUTOENCODER. stat 1050 (2016), 4.
  16. [101]101. Ray Marshall. 1974. The economics of racial discrimination: A survey. Journal of Economic Literature 12, 3 (1974), 849-871.
  17. [110]110. Hannah Jean Miller, Jacob Thebault-Spieker, Shuo Chang, Isaac Johnson, Loren Terveen, and Brent Hecht. 2016. "Blissfully Happy" or "Ready toFight": Varying Interpretations of Emoji. In Tenth International AAAI Conference on Web and Social Media.
  18. [128]128. Guyon, U. V. Luxburg, S. Bengio, H. Wallach, R. Fergus, S. Vishwanathan, and R. Garnett (Eds.). Curran Associates, Inc., 5680-5689. http: //papers.nips.cc/paper/7151-on-fairness-and-calibration.pdf
  19. [155]155. Steven L Willborn. 1984. The disparate impact model of discrimination: Theory and limits. Am. UL Rev. 34 (1984), 799.
  20. [161]161. Muhammad Bilal Zafar, Isabel Valera, Manuel Gomez Rodriguez, and Krishna P Gummadi. 2017. Fairness beyond disparate treatment & disparate impact: Learning classification without disparate mistreatment. In Proceedings of the 26th international conference on world wide web. 1171-1180.

Cited by

Sorted by citations

Authors
Mehrabi, N., Morstatter, F., Saxena, N., Lerman, K., & Galstyan, A.
Affiliations
USC-ISI
Venue
ACM Computing Surveys
Published
2021-07-13
Volume
54
Issue
6
Pages
1-35
ISSN
  • 0360-0300 (ISSN-L)
  • 1557-7341
OpenAlex
W2969896603
Cited by
5,812
References
152
Citations by year
2026: 1254 · 2025: 1532 · 2024: 1035 · 2023: 892 · 2022: 602 · 2021: 367 · 2020: 121 · 2019: 7 · 2018: 1
FWCI
905.17
Type
journal article
Language
en
Open access
Locations
  • ACM Computing Surveys (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Funders
Defense Advanced Research Projects Agency (Agreement No. HR0011890019.)
Topics
  • Social Sciences › Safety Research › Ethics and Social Impacts of AI
  • Physical Sciences › Computer Science › Artificial Intelligence › Explainable Artificial Intelligence (XAI)
  • Social Sciences › Law › Discrimination and Equality Law
Keywords
algorithmic fairness, machine learning bias, discrimination, fairness definitions, bias mitigation

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 ›

Are you an author, or do you see a problem with this page? Request a review