Preferential attachment in sexual networks
Preferential attachment in sexual networks
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DOI：
10.1073/pnas.0611337104
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发表时间：
2007-06-26
影响因子：
11.1
通讯作者：
Liljeros, Fredrik
中科院分区：
文献类型：
--
作者：
de Blasio, Birgitte Freiesleben;Svensson, Ake;Liljeros, Fredrik
许多社交网络的特点是链接分布极不均匀。在某些情况下，观察到的偏态分布被归因于偏好连接（PA），这是一种在不断增长的网络中，节点之间倾向于形成新的链接，而不是拥有大量链接的节点。我们在性接触网络中测试PA猜想。一个最大似然估计为基础的期望最大化拟合技术被用来模拟新的合作伙伴在1年的时间内的合作伙伴的数量在前面的2年，4年，和生命周期的基础上。PA模型进行修改，以考虑到个人的异质性倾向，找到新的合作伙伴和挪威的调查数据，异性恋男性和女性。结果表明，非随机的，次线性PA的证据时，比较在3至5年期间的增长。这些研究结果的潜在影响进行了讨论。
Many social networks are characterized by a highly uneven distribution of links. The observed skewed distributions have in several cases been attributed to preferential attachment (PA), a tendency among nodes in a growing network to form new links preferentially to nodes with high numbers of links. We test the PA conjecture in sexual contact networks. A maximum likelihood estimation-based expectation-maximization fitting technique is used to model new partners over a 1-year period based on the number of partners in foregoing periods of 2 years, 4 years, and lifetime. The PA model is modified to account for individual heterogeneity in the inclination to find new partners and fitted to Norwegian survey data on heterosexual men and women. Results show evidence of nonrandom, sublinear PA when comparing the growth in 3- to 5-year periods. The potential implications of these findings are discussed.