Assortativity
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The effect of social networks structure on innovation performance: A review and directions for research Open
Research on growth of innovations introduced to the market has gradually shifted its focus from aggregate-level diffusion to exploring how growth is influenced by a given social network structure's characteristics. In this paper, we critic…
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Homophily and Latent Attribute Inference: Inferring Latent Attributes of Twitter Users from Neighbors Open
In this paper, we extend existing work on latent attribute inference by leveraging the principle of homophily: we evaluate the inference accuracy gained by augmenting the user features with features derived from the Twitter profiles and po…
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Disrupted Network Topology in Patients with Stable and Progressive Mild Cognitive Impairment and Alzheimer's Disease Open
Recent findings suggest that Alzheimer's disease (AD) is a disconnection syndrome characterized by abnormalities in large-scale networks. However, the alterations that occur in network topology during the prodromal stages of AD, particular…
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When the Wikipedians Talk: Network and Tree Structure of Wikipedia Discussion Pages Open
Talk pages play a fundamental role in Wikipedia as the place for discussion and communication. In this work we use the comments on these pages to extract and study three networks, corresponding to different kinds of interactions. We find e…
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Multiscale mixing patterns in networks Open
Significance A central theme of network science is the heterogeneity present in real-life systems, for instance through the absence of a characteristic degree for the nodes. Despite their small-worldness, networks may present other types o…
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Evolutionary dynamics of cryptocurrency transaction networks: An empirical study Open
Cryptocurrency is a well-developed blockchain technology application that is currently a heated topic throughout the world. The public availability of transaction histories offers an opportunity to analyze and compare different cryptocurre…
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Towards Bayesian Quantification of Permeability in Micro-scale Porous Structures – The Database of Micro Networks Open
This article develops a Bayesian framework to quantify the absolute permeability of water in a porous structure from the geometry and clustering parameters of its underlying pore-throat network. These parameters include the network's diame…
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Emergence of Multiplex Communities in Collaboration Networks Open
Community structures in collaboration networks reflect the natural tendency of individuals to organize their work in groups in order to better achieve common goals. In most of the cases, individuals exploit their connections to introduce t…
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Assortativity Analysis of Real-World Network Graphs based on Centrality Metrics Open
Assortativity index (A. Index) of real-world network graphs has been traditionally computed based on the degree centrality metric and the networks were classified as assortative, dissortative or neutral if the A. Index values are respectiv…
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A complex network analysis of global tourism flows Open
In this paper, the global tourism network (GTN) is studied in order to gain insight about its structure and the interactions between source and destination markets. To concentrate on the main source and destination markets for each country…
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Network analysis of regional livestock trade in West Africa Open
In West Africa, long and complex livestock value chains connect producers mostly in the Sahel with consumption basins in urban areas and the coast. Regional livestock trade is highly informal and, despite recent efforts to understand anima…
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Statistical inference of assortative community structures Open
We develop a principled methodology to infer assortative communities in networks based on a nonparametric Bayesian formulation of the planted partition model. We show that this approach succeeds in finding statistically significant assorta…
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Integrating epigenomic data and 3D genomic structure with a new measure of chromatin assortativity Open
Contacts among promoters and between promoters and other elements have different characteristic epigenomic features. We identify a possible role for the elongating form of RNAPII in mediating interactions among promoters, enhancers, and tr…
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Resilience of Urban Network Structure in China: The Perspective of Disruption Open
In light of the long-term pressure and short-term impact of economic and technological globalization, regional and urban resilience has become an important issue in research. As a new organizational form of regional urban systems, the resi…
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The YouTube Social Network Open
Today, YouTube is the largest user-driven video content provider in the world; it has become a major platform for disseminating multimedia information. A major contribution to its success comes from the user-to-user social experience that …
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Systematic Review and Meta-Analysis of Sex Differences in Social Contact Patterns and Implications for Tuberculosis Transmission and Control Open
Social contact patterns might contribute to excess burden of tuberculosis in men. We conducted a study of social contact surveys to evaluate contact patterns relevant to tuberculosis transmission. Available data describe 21 surveys in 17 c…
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Evolution of Cooperation in Social Dilemmas on Complex Networks Open
Cooperation in social dilemmas is essential for the functioning of systems at multiple levels of complexity, from the simplest biological organisms to the most sophisticated human societies. Cooperation, although widespread, is fundamental…
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Convex Relaxation Methods for Community Detection Open
This paper surveys recent theoretical advances in convex optimization approaches for community detection. We introduce some important theoretical techniques and results for establishing the consistency of convex community detection under v…
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Social distance and network structures Open
This paper proposes a tractable model that allows us to analyze how agents' perception of relationships with others determines the structures of networks. In our model, agents are endowed with their own multidimensional characteristics and…
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Complex Network Analysis of the Bitcoin Transaction Network Open
In this brief, we conduct a complex-network analysis of the Bitcoin\ntransaction network. In particular, we design a new sampling method, namely\nrandom walk with flying-back (RWFB), to conduct effective data sampling. We\nthen conduct a c…
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Cascading failures in scale-free interdependent networks Open
Large cascades are a common occurrence in many natural and engineered complex systems. In this paper we explore the propagation of cascades across networks using realistic network topologies, such as heterogeneous degree distributions, as …
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Beyond homophily: Incorporating actor variables in statistical network models Open
We consider the specification of effects of numerical actor attributes, having an interval level of measurement, in statistical models for directed social networks. A fundamental mechanism is homophily or assortativity, where actors have a…
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Multifractality and Network Analysis of Phase Transition Open
Many models and real complex systems possess critical thresholds at which the systems shift dramatically from one sate to another. The discovery of early-warnings in the vicinity of critical points are of great importance to estimate how f…
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Brain Functional Connectivity in de novo Parkinson's Disease Patients Based on Clinical EEG Open
In Parkinson's disease (PD), cortical–subcortical interplay plays a relevant role in affecting clinical performance. Functional MRI sequences described changes in functional connectivity at different stages of disease. Scarce are, instead,…
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Age-Related Alterations in EEG Network Connectivity in Healthy Aging Open
Emerging studies have reported that functional brain networks change with increasing age. Graph theory is applied to understand the age-related differences in brain behavior and function, and functional connectivity between the regions is …
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Modes of Large-Scale Brain Network Organization during Threat Processing and Posttraumatic Stress Disorder Symptom Reduction during TF-CBT among Adolescent Girls Open
Posttraumatic stress disorder (PTSD) is often chronic and disabling across the lifespan. The gold standard treatment for adolescent PTSD is Trauma-Focused Cognitive-Behavioral Therapy (TF-CBT), though treatment response is variable and med…
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Latent indices in assortative matching models Open
A large class of two-sided matching models that include both transferable and non-transferable utility result in positive assortative matching along a latent index. Data from matching markets, however, may not exhibit perfect assortativity…
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Transitivity and degree assortativity explained: The bipartite structure of social networks Open
Dynamical processes, such as the diffusion of knowledge, opinions, pathogens, "fake news," innovation, and others, are highly dependent on the structure of the social network in which they occur. However, questions on why most social netwo…
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Robustness and efficiency in interconnected networks with changes in network assortativity Open
In this study, the effect of assortativity on the robustness and efficiency of interconnected networks was investigated. This involved constructing a network that possessed the desired degree of assortativity. Additionally, an interconnect…
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On semidefinite relaxations for the block model Open
The stochastic block model (SBM) is a popular tool for community detection in networks, but fitting it by maximum likelihood (MLE) involves a computationally infeasible optimization problem. We propose a new semidefinite programming (SDP) …