In this [study](http://www.plosone.org/article/info:doi%2F10.1371%2Fjournal.pone.0034358):
> Abstract: We test the effects of informal rewards in online peer production. Using a randomized, experimental design, we assigned editing awards or “barnstars” to a subset of the 1% most productive Wikipedia contributors. Comparison with the control group shows that receiving a barnstar increases productivity by 60% and makes contributors six times more likely to receive additional barnstars from other community members, revealing that informal rewards significantly impact individual effort.
I wonder why it is limited to the top 1%? I'd love to see the analysis repeated (should be trivial) on each decile. Besides satisfying my curiosity, some rationale and/or discussion of other deciles would also address any methodological concern about data dredging.
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