Detecting Media Bias in News Articles using Gaussian Bias Distributions

Wei-Fan Chen, Khalid Al Khatib, Benno Stein, Henning Wachsmuth


Abstract
Media plays an important role in shaping public opinion. Biased media can influence people in undesirable directions and hence should be unmasked as such. We observe that feature-based and neural text classification approaches which rely only on the distribution of low-level lexical information fail to detect media bias. This weakness becomes most noticeable for articles on new events, where words appear in new contexts and hence their “bias predictiveness” is unclear. In this paper, we therefore study how second-order information about biased statements in an article helps to improve detection effectiveness. In particular, we utilize the probability distributions of the frequency, positions, and sequential order of lexical and informational sentence-level bias in a Gaussian Mixture Model. On an existing media bias dataset, we find that the frequency and positions of biased statements strongly impact article-level bias, whereas their exact sequential order is secondary. Using a standard model for sentence-level bias detection, we provide empirical evidence that article-level bias detectors that use second-order information clearly outperform those without.
Anthology ID:
2020.findings-emnlp.383
Volume:
Findings of the Association for Computational Linguistics: EMNLP 2020
Month:
November
Year:
2020
Address:
Online
Venues:
EMNLP | Findings
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
4290–4300
Language:
URL:
https://aclanthology.org/2020.findings-emnlp.383
DOI:
10.18653/v1/2020.findings-emnlp.383
Bibkey:
Cite (ACL):
Wei-Fan Chen, Khalid Al Khatib, Benno Stein, and Henning Wachsmuth. 2020. Detecting Media Bias in News Articles using Gaussian Bias Distributions. In Findings of the Association for Computational Linguistics: EMNLP 2020, pages 4290–4300, Online. Association for Computational Linguistics.
Cite (Informal):
Detecting Media Bias in News Articles using Gaussian Bias Distributions (Chen et al., Findings 2020)
Copy Citation:
PDF:
https://aclanthology.org/2020.findings-emnlp.383.pdf
Code
 webis-de/EMNLP-20
Data
BASIL