Despite the well-known dependence of vertex and network structural parameters on network boundary specification employed by researchers, there has so far been effectively no discussion of this methodological caveat in the global and world city literature. Given the reliance of empirical studies of urban networks on the sampling of underlying actors that form these networks by their interactions, we consider it of key importance to examine the dependence of network centralities of cities on network boundary specification. We consider three distinctive modelling approaches based on: (a) office networks, (b) ownership ties and (c) inter-organisational projects. Our results indicate that city network centralities obtained from sampled networks are highly consistent with those obtained from whole network analysis for samples featuring as little as 4% (office networks), 10% (ownership ties) and 25% (inter-organisational projects) of the underlying actors.

尽管众所周知，顶点和网络结构参数依赖于研究人员采用的网络边界规范，但迄今为止，在全球和世界城市文献中，实际上都没有对这种方法上的警告进行讨论。鉴于对城市网络的实证研究依赖于通过其相互作用形成这些网络的潜在参与者的抽样，我们认为研究城市的网络中心性对网络边界规格的依赖性至关重要。我们基于以下三种独特的建模方法：（a）办公网络，（b）所有权关系和（c）组织间项目。