Biomedical Engineering Reference
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(
a
)
(
b
)
Figure 6.6
Exponent of power laws refl ects the distribution of participation.
(
a
) Curves are Newman's equation 28 [6], for (top to bottom)
2.05, 2.1, 2.2, 2.4, 2.7,
which are approximately the exponents for Twitter entries [19], Digg promote-demote
voting [10] , fi ve-star voting (this work and [9]), Wikipedia edits [10], and corporate
ideas (this work and [9]). Dashed gray line, if all participants contributed equally.
(
b
) Slice through part (
a
) illustrating how many people contribute 80% of the content.
α
=
intent, may be driven by small minorities. The types of data in Figure 6.6
appear to be in order of diffi culty or knowledge required (i.e., a fi ve - star vote
takes less effort or know-how than typing in an original contribution), which
suggests an important possibility: that the easier or less content rich the task,
the more it is likely to be driven by an active minority of participants. This is
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