Download Social Informatics: 8th International Conference, SocInfo by Emma Spiro, Yong-Yeol Ahn PDF

By Emma Spiro, Yong-Yeol Ahn

The two-volume set LNCS 10046 and 10047 constitutes the complaints of the eighth foreign convention on Social Informatics, SocInfo 2016, held in Bellevue, WA, united states, in November 2016.
The 36 complete papers and 39 poster papers offered during this quantity have been conscientiously reviewed and chosen from a hundred and twenty submissions. they're equipped in topical sections named: networks, groups, and teams; politics, information, and occasions; markets, crowds, and shoppers; and privateness, healthiness, and well-being.

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Additional resources for Social Informatics: 8th International Conference, SocInfo 2016, Bellevue, WA, USA, November 11-14, 2016, Proceedings, Part I

Example text

Since we are analyzing the negative welfare impact factor, we must upper bound u(a)/u(b). Observe that since cooperative voters have a lowered threshold of t , the claim paralleling Fact 1 is u(b) ≥ s (b)t . We also know that s (b) ≥ s∗ (a) since with cooperative voting there can only be more yes votes than under ordinary voting, so the winning score of b must be at least that of a. Taking these two inequalities together gives us u(b) ≥ s∗ (a)t . Fact 2 now becomes u(a) < s∗ (a) + (n − s∗ (a))t.

Participants 1 2 1 cooperative 0 t − n − 1 ordinary 1 t Participants 1 2 n/2 cooperative 0 t < t n/2 ordinary 1 0 Participants 1 2 c cooperative t < t 1 n − c ordinary 0 t− (a) (b) (c) As alarming as Lemma 11 may be, we show in Lemma 12 based on the instance in Table 5c that cooperative voting can have an even more harmful impact. The moral here for Doodle poll participants is perhaps as follows: if you think you are being helpful by voting yes generously in a Doodle poll, don’t be so sure: you might actually be making things worse overall.

The ordinary voters are unchanged in their votes. Hence, s (a1 ) = n and s (a2 ) = n − c, ensuring that slot a1 is chosen. The improvement in social welfare when slot a1 is chosen due to cooperative voters rather than when slot c a2 can be chosen when all voters vote ordinarily is thus a factor of 1t + n−c (suppressing epsilon terms). Proof (of Lemma 10). The proof is analogous to the proof of Lemma 3, except rather than restrictive voters, we have c cooperative voters. Note that Facts 1 and 2 which lower bound the utility of slot a, the slot that is chosen when everyone is an ordinary voter, and upper bound the utility of slot b, the slot that is chosen when c of the n voters vote cooperatively, still stand as they are established purely on the reported scores of the two time slots when all voters are ordinary.

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