According to Andrew Lih, a member of Journalism and Media Studies Centre at University of Hong Kong, on his research article for the 5th International Symposium on Online Journalism (April 16-17, 2004) University of Austin, "Wikipedia as Participatory Journalism: Reliable Sources? Metrics for evaluating collaborative media as a news resource". This article mentioned about a study that helps evaluate Wikipedia's content after giving an overview history and growth of the Wikipedia project.
On page 2, Lih shows us a clear roadmap of his article.
Figure 1 does not show enough information which is described in details around.
Thesis: high qualily articles are going to have more edits and various kinds of editors. Lih also pays attention to how mentioning of the articles by other resources if affected...