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分类依据与纠错

AI 根据所提供的论文材料归类:摘要明确研究成对网络连边形成、个体固定效应及仅凭网络数据的估计,直接对应网络与干扰方向中的网络建模。

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代码、数据与补充材料

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关注这篇论文的作者
L. Sanna Stephan

缺乏可观测特征的成对连边形成模型中个体系数的半参数估计

研究问题
只有网络连边数据、缺少个体或连边特征且不指定噪声分布时,如何估计代表相对受欢迎程度的个体固定效应并处理排序问题?
方法与思路
作者调整既有半参数程序,仅利用网络数据估计个体固定效应,并提出数据驱动的归一化方式,以处理单调性未落实带来的排序及数值问题。
材料陈述的贡献
摘要称,新归一化在许多情形优于常规标准化,且归一化系数与已知真实误差分布时具有相同收敛速率和极限分布。
阅读关注点
应核对连边模型、固定效应识别与归一化条件,尤其是排序反转如何被修正,以及与已知误差分布情形等价的渐近结论。
阅读边界
这是 arXiv 预印本,同行评审及期刊接收未经核验;摘要未说明完整识别条件和网络渐近设定,也未交代新成员连边预测的实现。

原文摘要

Dyadic network formation models have wide applicability in economic research, yet are difficult to estimate in the presence of individual specific effects and in the absence of distributional assumptions regarding the model noise component. The availability of (continuously distributed) individual or link characteristics generally facilitates estimation. Yet, while data on social networks has recently become more abundant, the characteristics of the entities involved in the link may not be measured. Adapting the procedure of \citet{KS}, I propose to use network data alone in a semiparametric estimation of the individual fixed effect coefficients, which carry the interpretation of the individual relative popularity. This entails the possibility to anticipate how a new-coming individual will connect in a pre-existing group. The estimator, needed for its fast convergence, fails to implement the monotonicity assumption regarding the model noise component, thereby potentially reversing the order if the fixed effect coefficients. This and other numerical issues can be conveniently tackled by my novel, data-driven way of normalising the fixed effects, which proves to outperform a conventional standardisation in many cases. I demonstrate that the normalised coefficients converge both at the same rate and to the same limiting distribution as if the true error distribution was known. The cost of semiparametric estimation is thus purely computational, while the potential benefits are large whenever the errors have a strongly convex or strongly concave distribution.

笔记与分组
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