Quantifying Generative Media Bias with a Corpus of Real-world and Generated News Articles

• URL: http://arxiv.org/abs/2406.10773v1
• Date: Sun, 16 Jun 2024 01:32:04 GMT
• Title: Quantifying Generative Media Bias with a Corpus of Real-world and Generated News Articles
• Authors: Filip Trhlik, Pontus Stenetorp,
• Abstract summary: Large language models (LLMs) are increasingly being utilised across a range of tasks and domains. This study focuses on political bias, detecting it using both supervised models and LLMs. For the first time within the journalistic domain, this study outlines a framework for quantifiable experiments.
• Score: 12.356251871670011
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Large language models (LLMs) are increasingly being utilised across a range of tasks and domains, with a burgeoning interest in their application within the field of journalism. This trend raises concerns due to our limited understanding of LLM behaviour in this domain, especially with respect to political bias. Existing studies predominantly focus on LLMs undertaking political questionnaires, which offers only limited insights into their biases and operational nuances. To address this gap, our study establishes a new curated dataset that contains 2,100 human-written articles and utilises their descriptions to generate 56,700 synthetic articles using nine LLMs. This enables us to analyse shifts in properties between human-authored and machine-generated articles, with this study focusing on political bias, detecting it using both supervised models and LLMs. Our findings reveal significant disparities between base and instruction-tuned LLMs, with instruction-tuned models exhibiting consistent political bias. Furthermore, we are able to study how LLMs behave as classifiers, observing their display of political bias even in this role. Overall, for the first time within the journalistic domain, this study outlines a framework and provides a structured dataset for quantifiable experiments, serving as a foundation for further research into LLM political bias and its implications.

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