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arXiv 1808.01637math.PR
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定向偏好依恋模型中的度增长率与指数估计

Degree Growth Rates and Index Estimation in a Directed Preferential Attachment Model

Tiandong Wang, Sidney I. Resnick

摘要:

偏好连接被广泛用于模拟有向和无向网络中度分布的幂律行为。在有向偏好依恋模型中,尽管存在众所周知的边际幂律度分布,但对入度和出度增长的联合行为却没有太多的研究。此外,幂律度分布的边际尾指数的统计估计通常使用希尔估计作为关键的汇总统计量之一,即使没有给出理论依据。本文重点讨论了入度和出度的联合经验测度的收敛性,并证明了Hill估计的相合性。为此,我们首先通过将固定节点的入度和出度嵌入到一对带有移民的切换出生过程中来推导出联合度序列的渐近行为,然后建立联合尾经验测度的收敛性。通过这些步骤,得到了Hill估计量的相合性。

英文摘要:

Preferential attachment is widely used to model power-law behavior of degree distributions in both directed and undirected networks. In a directed preferential attachment model, despite the well-known marginal power-law degree distributions, not much investigation has been done on the joint behavior of the in- and out-degree growth. Also, statistical estimates of the marginal tail exponent of the power-law degree distribution often use the Hill estimator as one of the key summary statistics, even though no theoretical justification has been given. This paper focuses on convergence of the joint empirical measure for in- and out-degrees and proves the consistency of the Hill estimator. To do this, we first derive the asymptotic behavior of the joint degree sequences by embedding the in- and out-degrees of a fixed node into a pair of switched birth processes with immigration and then establish the convergence of the joint tail empirical measure. From these steps, the consistency of the Hill estimators is obtained.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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