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Wikipedia as a Data Source for Political Scientists: Accuracy and Completeness of Coverage

  • Adam R. Brown (a1)

In only 10 years, Wikipedia has risen from obscurity to become the dominant information source for an entire generation. However, any visitor can edit any page on Wikipedia, which hardly fosters confidence in its accuracy. In this article, I review thousands of Wikipedia articles about candidates, elections, and officeholders to assess both the accuracy and the thoroughness of Wikipedia's coverage. I find that Wikipedia is almost always accurate when a relevant article exists, but errors of omission are extremely frequent. These errors of omission follow a predictable pattern. Wikipedia's political coverage is often very good for recent or prominent topics but is lacking on older or more obscure topics.

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Blumenstock, Joshue E. 2008. “Size Matters: Word Count as a Measure of Quality on Wikipedia.” Paper presented at the 17th International Conference on the World Wide Web, Beijing, China, April 21–25.
Bragues, George. 2007. “Wiki-Philosophizing in a Marketplace of Ideas: Evaluating Wikipedia's Entries on Seven Great Minds. Working paper.
Clauson, Kevin A., Polen, Hyla H., Boulos, Maged N. Kamel, and Dzenowagis, Joan H.. 2008. “Scope, Completeness, and Accuracy of Drug Information in Wikipedia.” Annals of Pharmacotherapy 42 (12): 1,814–21.
Cohen, Noam. 2008. “Don't Like Palin's Wikipedia Story? Change It.” New York Times, August 31.
Devgan, Lara, Powe, Neil, Blakely, Brittony, and Makary, Martin. 2007. “Wiki-Surgery? Internal Validity of Wikipedia as a Medical and Surgical Reference.” Journal of the American College of Surgeons 205 (suppl): S76S77.
Giles, Jim. 2005. “Special Report: Internet Encyclopedias Go Head to Head.” Nature 438:900–01.
Gralla, Preston. 2009. “What Was Encarta? Look It Up on Wikipedia.” PC World, March 31.
McDougall, Paul. 2009. “Microsoft Encarta is Web 2.0's Latest Victim.” InformationWeek, March 31.
Meredith, Marc. 2010. “Exploiting Friends and Neighbors: An Instrumental Variable Approach to Estimating Coattail Effects.” Paper presented at the 10th State Policy and Politics Conference, Springfield, Illinois, June 3–5.
Nicholson, Daren T. 2006. “An Evaluation of the Quality of Consumer Health Information on Wikipedia.” Master's capstone, Oregon Health and Science University School of Medicine.
Pender, Michael, Lasserre, Kaye, Kruesi, Lisa, Del Mar, Christopher, and Anaradha, Satyamurthy. 2008. “Putting Wikipedia to the Test: A Case Study.” Paper presented at to the Special Libraries Association Annual Conference, Seattle, June 16.
Rainie, Lee, and Tancer, Bill. 2007. “Wikipedia Users.” Pew Internet, Pew Research Center.
Rector, Lucy Holman. 2008. “Comparison of Wikipedia and Other Encyclopedias for Accuracy, Breadth, and Depth in Historical Articles.” Reference Services Review 36 (1): 722.
Royal, Cindy, and Kapila, Deepina. 2009. “What's on Wikipedia and What's Not… ?Social Science Computer Review 27 (1): 138–48.
Time. 2007. “10 Questions: Jimmy Wales.” Time, March 21.,8599,1601491,00.html.
Young, Jeff. 2006. “Wikipedia Founder Discourages Academic Use of His Creation.” Chronicle of Higher Education, June 12.
Zaller, John R. 1992. The Nature and Origins of Mass Opinion. New York: Cambridge University Press.
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PS: Political Science & Politics
  • ISSN: 1049-0965
  • EISSN: 1537-5935
  • URL: /core/journals/ps-political-science-and-politics
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