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Worldwide clustering of the corruption perception

Paulus, Michal; Kristoufek, Ladislav - In: Physica A: Statistical Mechanics and its Applications 428 (2015) C, pp. 351-358

We inspect a possible clustering structure of the corruption perception among 134 countries. Using the average linkage … clustering, we uncover a well-defined hierarchy in the relationships among countries. Four main clusters are identified and they … of hierarchical and clustering methods to the specific case of corruption. …

Persistent link: https://www.econbiz.de/10011209714

Kinetic equations for smooth granular systems II. The non-homogeneous gas

Morgado, W.A.M.; Oppenheim, I. - In: Physica A: Statistical Mechanics and its Applications 252 (1998) 3, pp. 308-324

compared to the propagating modes of the system. This suggests that a mechanism of clustering is responsible for the relative …

Persistent link: https://www.econbiz.de/10010599484

Interaction between buses and passengers on a bus route

Nagatani, Takashi - In: Physica A: Statistical Mechanics and its Applications 296 (2001) 1, pp. 320-330

We study the bus delay and the passenger behaviour on a bus route by the use of the bus route model. The time-headway model of the bus route is extended to take into account the passengers on buses. The bus delay relates with the number of passengers on buses. It is shown that the dynamical...

Persistent link: https://www.econbiz.de/10010588407

Will the US economy recover in 2010? A minimal spanning tree study

Zhang, Yiting; Lee, Gladys Hui Ting; Wong, Jian Cheng; … - In: Physica A: Statistical Mechanics and its Applications 390 (2011) 11, pp. 2020-2050

We calculated the cross correlations between the half-hourly times series of the ten Dow Jones US economic sectors over the period February 2000 to August 2008, the two-year intervals 2002–2003, 2004–2005, 2008–2009, and also over 11 segments within the present financial crisis, to...

Persistent link: https://www.econbiz.de/10010588479

Tuning degree distributions: Departing from scale-free networks

Leary, C.C.; Schwehm, M.; Eichner, M.; Duerr, H.P. - In: Physica A: Statistical Mechanics and its Applications 382 (2007) 2, pp. 731-738

Scale-free networks are characterized by a degree distribution with power-law behavior. Although scale-free networks have been shown to arise in many areas, ranging from the World Wide Web to transportation or social networks, degree distributions of other observed networks often differ from the...

Persistent link: https://www.econbiz.de/10010588755

Characteristics of microRNA co-target networks

Lee, Chang-Yong - In: Physica A: Statistical Mechanics and its Applications 390 (2011) 14, pp. 2728-2737

The database of microRNAs and their predicted target genes in humans were used to extract a microRNA co-target network. Based on the finding that more than two miRNAs can target the same gene, we constructed a microRNA co-target network and analyzed it from the perspective of the complex...

Persistent link: https://www.econbiz.de/10010588996

Clustering of financial time series with application to index and enhanced index tracking portfolio

Dose, Christian; Cincotti, Silvano - In: Physica A: Statistical Mechanics and its Applications 355 (2005) 1, pp. 145-151

including transaction costs. Computational results based on clustering selection are compared to those of random techniques and … show the importance of clustering in noise reduction and robust forecasting applications, in particular for enhanced index …

Persistent link: https://www.econbiz.de/10010589147

Accuracy and robustness of clustering algorithms for small-size applications in bioinformatics

Minicozzi, Pamela; Rapallo, Fabio; Scalas, Enrico; … - In: Physica A: Statistical Mechanics and its Applications 387 (2008) 25, pp. 6310-6318

The performance (accuracy and robustness) of several clustering algorithms is studied for linearly dependent random … posteriori criterion to choose between two discordant clustering algorithm is presented. …

Persistent link: https://www.econbiz.de/10010589295

Numerical analysis of a time-headway bus route model

Hill, Scott A. - In: Physica A: Statistical Mechanics and its Applications 328 (2003) 1, pp. 261-273

In this paper, we consider a time-headway model, introduced in Ref. [Physica A 296 (2001) 320], for buses on a bus route. By including a simple no-passing rule, we are able to enumerate and study the unstable modes of a homogeneous system. We then discuss the application of the model to...

Persistent link: https://www.econbiz.de/10010589374

Analysis of networks using generalized mutual entropies

Gudkov, V.; Montealegre, V. - In: Physica A: Statistical Mechanics and its Applications 387 (2008) 11, pp. 2620-2630

Generalized mutual entropy is defined for networks and applied in the analysis of complex network structures. The method is tested for the case of computer simulated scale-free networks, random networks, and their mixtures. The possible applications for real network analysis are discussed.

Persistent link: https://www.econbiz.de/10010589627