PS: Political Science & Politics


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

Adam R. Browna1

a1 Brigham Young University


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.

Adam R. Brown is an assistant professor of political science at Brigham Young University and a research fellow at the university's Center for the Study of Elections and Democracy. He received his Ph.D. from the University of California, San Diego. He can be reached at


I thank Katrina Smith Cammack and Matt Ipson for their expert research assistance. Any faults that remain are my own.