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Empirical studies about wikipedia
Empirical studies about wikipedia
Empirical studies about wikipedia
Empirical studies about wikipedia
Empirical studies about wikipedia
Empirical studies about wikipedia
Empirical studies about wikipedia
Empirical studies about wikipedia
Empirical studies about wikipedia
Empirical studies about wikipedia
Empirical studies about wikipedia
Empirical studies about wikipedia
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Empirical studies about wikipedia

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  • 1. Dynamics of libre software communities Introduction to empirical studies about contributions to Wikipedia. Master on Free Software
  • 2. 1. Contextual framework ● Libre and open source software have been thoroughly studied. ● However, that is not the case for open contents creation. – Wikipedia is the most successful example of libre contents creation projects. ● A freely accessible and editable encyclopaedia. Master on Free Software
  • 3. 2. Wikipedia features ● Based on MediaWiki. Master on Free Software
  • 4. 2. Wikipedia features ● Embedded tools in MediaWiki. Master on Free Software
  • 5. 2. Wikipedia features ● Wiki style to add and update contents. – It supports multimedia contents, image galleries, bibliography references, mathematical equations... ● Provide many templates for automatic arranging and indexing of contents. – Table of contents. – Archive pages. – Transcluded pages. Master on Free Software
  • 6. 2. Wikipedia features ● Talk pages. Master on Free Software
  • 7. 2. Wikipedia features ● Everyone can edit contents. – Respect NPoV. – Provide sources. Do not use propietary content. ● http://en.wikipedia.org/wiki/Wikipedia:Annotated_article – Trustworthy contents? ● Nature magazine's study about accuracy of Wikipiedia articles. – Vandalism. – “Edit wars”. Master on Free Software
  • 8. 3. Main areas of study. ● We can study many aspects in Wikipedia. – General statistics and evolution in time. – Community related parameters and content creation process. ● Author's reputation. – Article contents: mainly quality. – Content semantic... – Social networks... Master on Free Software
  • 9. 4. “Measuring Wikipedia” ● By Jakob Voss. – Focused on the German edition. – Exponential growth. – Articles' size ditribution --> tends to log-norm – Distinct authors/article ● Power law γ=2,7 – Distinct articles/author ● Power law γ=1,5 – Edits/author ● Power law γ=0,5 Master on Free Software
  • 10. 4. “On the evolution of Wikipedia” ● By Almeida, Mozafari and Cho. – Revision and creation of articles. ● Follows a self-similar process. – Number of articles contributed per user. ● Decreasing over time. – Time between edits to an article. ● Power law distribution. – Users tend to focus their contributions on a small set of articles. Master on Free Software
  • 11. 4. “Studying cooperation and conflicts...” ● By Viégas, Wattemberg and Dave. – Types of vandalism. ● Mass deletion, offensive copy, phony copy... ● Half of mass deletions reverted within 3 mins. – Visualization of negotiation process. ● Edit wars --> zig-zag patterns. – Contents of pages with at least 100 edits tend to grow linearly. – Superb visualization tool-->History flow. Master on Free Software
  • 12. 4. “On the inequality of contributions...” ● Ortega, Gonzalez-Barahona and Robles. – Gini coefficients (tot. num. revisions). ● Between 0.925 and 0.963. ● It tends to decrease as the number of authors and the number of articles grow. – Evolution in time of Gini coefficients. ● Stabilized between 80-85% in the top-ten language editions (last 2 years). – Japanese language edition. ● Outlier values --> deserves further investigation. Master on Free Software

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