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Shifting Ideologies? Re-examining Media Bias

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  • Gasper, John T.

Abstract

This research note engages the current research on measuring media bias. I present a reanalysis of the results found in Groseclose and Milyo (2005) and show that the original parameter estimates of the ideological positions of media outlets are not stable over time. Using the same data but analyzed over different periods of time, I find a different conclusion than the previous article. I examine four-year rolling time periods and find that the data produce different parameter estimates in the early- to mid-1990s as compared to after 2000, with all analyzed outlets appearing more moderate or conservative in later time periods. My results indicate that the estimated positions are sensitive observations in the data and the time period of observation of the outlet.

Suggested Citation

  • Gasper, John T., 2011. "Shifting Ideologies? Re-examining Media Bias," Quarterly Journal of Political Science, now publishers, vol. 6(1), pages 85-102, August.
    • Handle: RePEc:now:jlqjps:100.00010006
    DOI: 10.1561/100.00010006
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    Cited by:

    1. Riccardo Puglisi & James M. Snyder Jr., 2015. "The Balanced Us Press," Journal of the European Economic Association, European Economic Association, vol. 13(2), pages 240-264, April.
    2. David Rozado & Musa al-Gharbi, 2022. "Using word embeddings to probe sentiment associations of politically loaded terms in news and opinion articles from news media outlets," Journal of Computational Social Science, Springer, vol. 5(1), pages 427-448, May.

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