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A Measure of Media Bias

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Author Info
Jeffrey Milyo () (Department of Economics, University of Missouri-Columbia)
Tim Groseclose (Department of Political Science, UCLA)

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Abstract

In this paper we estimate ADA (Americans for Democratic Action) scores for major media outlets such as the New York Times, USA Today, Fox News Special Report, and all three network television news shows. Our estimates allow us to answer such questions as Is the average article in the New York Times more liberal than the average speech by Tom Daschle? or Is the average story on Fox News more conservative than the average speech by Bill Frist? To compute our measure, we count the times that a media outlet cites various think tanks and other policy groups. We compare this with the times that members of Congress cite the same groups in their speeches on the floor of the House and Senate. By comparing the citation patterns we construct an ADA score. As a simplified example, imagine that there were only two think tanks, and suppose that the New York Times cited the first think tank twice as often as the second. Our method asks: What is the typical ADA score of members of Congress who exhibit the same frequency (2:1) in their speeches? This is the score that we would assign to the New York Times. Our results show a strong liberal bias. All of the news outlets except Fox News Special Report and the Washington Times received a score to the left of the average member of Congress. Consistent with many conservative critics, CBS Evening News and the New York Times received a score far left of center. Outlets such as USA Today, NPRs Morning Edition, NBCs Nightly News and ABCs World News Tonight were moderately left. The most centrist outlets (but still left-leaning) by our measure were the Newshour with Jim Lehrer, CNNs NewsNight with Aaron Brown, and ABCs Good Morning America. Fox News Special Report, while right of center, was closer to the center than any of the three major networks evening news broadcasts. All of our findings refer strictly to the news stories of the outlets. That is, we omitted editorials, book reviews, and letters to the editor from our sample.

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Publisher Info
Paper provided by Department of Economics, University of Missouri in its series Working Papers with number 0501.

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Length: 62 pgs.
Date of creation: 03 Jan 2005
Date of revision: 25 Aug 2005
Publication status: forthcoming in Quarterly Journal of Economics
Handle: RePEc:umc:wpaper:0501

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Related research
Keywords: Media Bias

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Find related papers by JEL classification:
D29 - Microeconomics - - Production and Organizations - - - Other
D79 - Microeconomics - - Analysis of Collective Decision-Making - - - Other
H89 - Public Economics - - Miscellaneous Issues - - - Other

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References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
  1. Djankov, Simeon & et al, 2003. "Who Owns the Media?," Journal of Law & Economics, University of Chicago Press, vol. 46(2), pages 341-81, October.
    Other versions:
  2. Sendhil Mullainathan & Andrei Shleifer, 2005. "The Market for News," American Economic Review, American Economic Association, vol. 95(4), pages 1031-1053, September. [Downloadable!] (restricted)
  3. Hamada, Michael & Sitter, Randy, 2004. "Response," The American Statistician, American Statistical Association, vol. 58, pages 202-202, August. [Downloadable!] (restricted)
  4. John R. Lott & Jr., 1999. "Public Schooling, Indoctrination, and Totalitarianism," Journal of Political Economy, University of Chicago Press, vol. 107(S6), pages S127-29, December. [Downloadable!] (restricted)
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Cited by:
(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Matthew Ellman & Fabrizio Germano, 2004. "What Do the Papers Sell?," Economics Working Papers 800, Department of Economics and Business, Universitat Pompeu Fabra, revised Feb 2006. [Downloadable!]
  2. Bütler, Monika & Maréchal, Michel André, 2007. "Framing Effects in Political Decision Making: Evidence From a Natural Voting Experiment," CEPR Discussion Papers 6200, C.E.P.R. Discussion Papers. [Downloadable!] (restricted)
    Other versions:
  3. Riccardo Puglisi, 2006. "Being The New York Times: Thepolitical Behaviour Of A Newspaper," STICERD - Political Economy and Public Policy Paper Series 20, Suntory and Toyota International Centres for Economics and Related Disciplines, LSE. [Downloadable!]
  4. Jill McCluskey & Johan F.M. Swinnen, 2007. "Rational Ignorance and Negative News in the Information Market," LICOS Discussion Papers 19107, LICOS - Centre for Institutions and Economic Performance, K.U.Leuven. [Downloadable!]
  5. Stefano DellaVigna & Ethan Kaplan, 2006. "The Fox News Effect: Media Bias and Voting," NBER Working Papers 12169, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  6. Jonathan Reuter & Eric Zitzewitz, 2005. "Do Ads Influence Editors? Advertising and Bias in the Financial Media," Finance 0501003, EconWPA. [Downloadable!]
    Other versions:
  7. Valentino Larcinese & Riccardo Puglisi & James M. Snyder, Jr., 2007. "Partisan Bias in Economic News: Evidence on the Agenda-Setting Behavior of U.S. Newspapers," NBER Working Papers 13378, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  8. Dan Bernhardt & Stefan Krasa & Mattias Polborn, 2006. "Political Polarization and the Electoral Effects of Media Bias," CESifo Working Paper Series CESifo Working Paper No. , CESifo GmbH. [Downloadable!]
  9. DellaVigna, Stefano & Kaplan, Ethan, 2006. "The Fox News Effect: Media Bias and Voting," Seminar Papers 748, Stockholm University, Institute for International Economic Studies. [Downloadable!]
  10. Timothy Besley & Andrea Prat, 2006. "Handcuffs for the Grabbing Hand? Media Capture and Government Accountability," American Economic Review, American Economic Association, vol. 96(3), pages 720-736, June.
    Other versions:
  11. Helge Berger & Michael Ehrmann & Marcel Fratzscher, 2006. "Monetary policy in the media," Working Paper Series 679, European Central Bank. [Downloadable!]
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