I find this paper quite an interesting read:
A Latent Space Analysis of Editor Lifecycles in Wikipedia
Xiangju Qin, Derek Greene, Pádraig Cunningham
In it, the authors suggest that Wikipedians who are focused tend to stay longer editing
the encyclopedia and they’ve actually shown that understanding patterns of change in user
behavior can be of practical importance for community management and maintenance.
Regrettably, its filled with heavy jargon and statistical models but it might just be
useful to those working on the Editor Retention Program?
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