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Related Concept Videos

Bias01:22

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Bias refers to any tendency that prevents a question from being considered unprejudiced. In research, bias occurs when one outcome or answer is selected or encouraged over others in sampling or testing. Bias can occur during any research phase, including study design, data collection, analysis, and publication.
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Measuring dynamic media bias.

Eunji Kim1, Yphtach Lelkes2, Joshua McCrain3

  • 1Department of Political Science, Columbia University, New York, NY 10027.

Proceedings of the National Academy of Sciences of the United States of America
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Media bias in politics is not static but highly dynamic, even in the short term. Prime-time shows on TV channels significantly drive the increasing polarization observed over time.

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Area of Science:

  • Political Science
  • Media Studies
  • Communication Research

Background:

  • The study of ideological media bias is crucial in political science.
  • Existing research often assumes media bias is static and independent of political processes.
  • This study challenges the assumption of static media bias.

Purpose of the Study:

  • To investigate the dynamic nature of ideological media bias.
  • To analyze media bias at weekly, within-day, and program-specific levels.
  • To identify factors contributing to heightened polarization in media over time.

Main Methods:

  • Utilized longitudinal data from the Stanford Cable News Analyzer (2010-2021).
  • Quantified the partisan leaning of political actors via their campaign donation history.
  • Defined and measured media bias as 'visibility bias' (mean ideology of actors featured).

Main Results:

  • Media bias demonstrates significant dynamism, even over short durations.
  • Visibility bias varies considerably across different time scales (weekly, daily, program-level).
  • Prime-time programming was identified as the primary driver of increased polarization between TV channels.

Conclusions:

  • Ideological media bias is not a fixed attribute but a fluid characteristic.
  • The temporal dynamics of media bias, particularly in prime-time, are critical for understanding political polarization.
  • Future research should account for the evolving nature of media bias in political analysis.