Detecting highly overlapping community structure by greedy clique expansionIn complex networks it is common for each node to belong to several communities, implying a highly overlapping community structure. Recent advances in benchmarking indicate that existing community…Conrad Lee, Fergal Reid, Aaron McDaid et al.·Feb 9, 2010SaveLearn
On the meaning of the h-indexThe h-index -- the value for which an individual has published at least h papers with at least h citations -- has become a popular metric to assess the citation impact of scientists. As already noted…S. Redner·Feb 4, 2010SaveLearn
Soccer: is scoring goals a predictable Poissonian process?The non-scientific event of a soccer match is analysed on a strictly scientific level. The analysis is based on the recently introduced concept of a team fitness (Eur. Phys. J. B 67, 445, 2009) and…Andreas Heuer, Christian Mueller, Oliver Rubner·Feb 3, 2010SaveLearn
Complex networks: new trends for the analysis of brain connectivityToday, the human brain can be studied as a whole. Electroencephalography, magnetoencephalography, or functional magnetic resonance imaging techniques provide functional connectivity patterns between…Mario Chavez, Miguel Valencia, Vito Latora et al.·Feb 3, 2010SaveLearn
Fragmentation of a viscoelastic food by human masticationFragment-size distributions have been studied experimentally in masticated viscoelastic food (fish sausage).The mastication experiment in seven subjects was examined. We classified the obtained…Naoki Kobayashi, Kaoru Kohyama, Kouichi Shiozawa·Feb 2, 2010SaveLearn
What makes a phase transition? Analysis of the random satisfiability problemIn the last 30 years it was found that many combinatorial systems undergo phase transitions. One of the most important examples of these can be found among the random k-satisfiability problems (often…K. A. Zweig, G. Palla, T. Vicsek·Feb 1, 2010SaveLearn
Influence of solar magnetic activity on the North American temperature recordThe effect of solar magnetic activity on the yearly mean average temperature is extracted from the historical record for much of North America. The level of solar activity is derived from the…Robert W. Johnson·Jan 30, 2010SaveLearn
Is the European Monetary System converging to integration?The emerging system at the European level can be conceptualized as a pattern of relations among member states that tends to be reproduced despite disturbances in individual trajectories. The Markov…Loet Leydesdorff, Nienke Oomes·Jan 25, 2010SaveLearn
Analytical continuation of imaginary axis data using maximum entropyWe study the maximum entropy (MaxEnt) approach for analytical continuation of spectral data from imaginary times to real frequencies. The total error is divided in a statistical error, due to the…O. Gunnarsson, M. W. Haverkort, G. Sangiovanni·Jan 25, 2010SaveLearn
On the Correct Use of Statistical Tests: Reply to "Lies, damned lies and statistics (in Geology)"In a Forum published in EOS Transactions AGU (2009) entitled "Lies, damned lies and statistics (in Geology)", Vermeesch (2009) claims that "statistical significant is not the same as…D. Sornette, V. Pisarenko·Jan 23, 2010SaveLearn
Noise bridges dynamical correlation and topology in coupled oscillator networksWe study the relationship between dynamical properties and interaction patterns in complex oscillator networks in the presence of noise. A striking finding is that noise leads to a general,…Jie Ren, Wen-Xu Wang, Baowen Li et al.·Jan 22, 2010SaveLearn
The Failure of the Ergodic AssumptionThe well established procedure of constructing phenomenological ensemble from a single long time series is investigated. It is determined that a time series generated by a simple Uhlenbeck-Ornstein…M. Ignaccolo, M. Latka, B. J. West·Jan 22, 2010SaveLearn
Effect of extreme data loss on long-range correlated and anti-correlated signals quantified by detrended fluctuation analysisWe investigate how extreme loss of data affects the scaling behavior of long-range power-law correlated and anti-correlated signals applying the DFA method. We introduce a segmentation approach to…Qianli D. Y. Ma, Ronny P. Bartsch, Pedro Bernaola-Galván et al.·Jan 20, 2010SaveLearn
Symbolic Sequences and Tsallis EntropyWe address this work to investigate symbolic sequences with long-range correlations by using computational simulation. We analyze sequences with two, three and four symbols that could be repeated l…H. V. Ribeiro, E. K. Lenzi, R. S. Mendes et al.·Jan 16, 2010SaveLearn
Dynamics of tournaments: the soccer caseA random walk-like model is considered to discuss statistical aspects of tournaments. The model is applied to soccer leagues with emphasis on the scores. This competitive system was computationally…H. V. Ribeiro, R. S. Mendes, L. C. Malacarne et al.·Jan 16, 2010SaveLearn
Point Processes Modeling of Time Series Exhibiting Power-Law StatisticsWe consider stochastic point processes generating time series exhibiting power laws of spectrum and distribution density (Phys. Rev. E 71, 051105 (2005)) and apply them for modeling the trading…B. Kaulakys, M. Alaburda, V. Gontis·Jan 15, 2010SaveLearn
Modeling non-Gaussian 1/f Noise by the Stochastic Differential EquationsWe consider stochastic model based on the linear stochastic differential equation with the linear relaxation and with the diffusion-like fluctuations of the relaxation rate. The model generates…B. Kaulakys, M. Alaburda, J. Ruseckas·Jan 15, 2010SaveLearn
Segmentation algorithm for non-stationary compound Poisson processesWe introduce an algorithm for the segmentation of a class of regime switching processes. The segmentation algorithm is a non parametric statistical method able to identify the regimes (patches) of…Bence Toth, Fabrizio Lillo, J. Doyne Farmer·Jan 14, 2010SaveLearn
Link Prediction Based on Local Random WalkThe problem of missing link prediction in complex networks has attracted much attention recently. Two difficulties in link prediction are the sparsity and huge size of the target networks. Therefore,…Weiping Liu, Linyuan Lu·Jan 14, 2010SaveLearn
Restoration of three-dimensional correlation function and structure factor from two-dimensional observationsThe static pair correlation (distribution) function and the structure factor of particle distributions in three-dimensional homogeneous isotropic systems are explicitly restored from two-dimensional…Hiroo Totsuji·Dec 29, 2009SaveLearn
Line Graphs of Weighted Networks for Overlapping CommunitiesIn this paper, we develop the idea to partition the edges of a weighted graph in order to uncover overlapping communities of its nodes. Our approach is based on the construction of different types of…T. S. Evans, R. Lambiotte·Dec 22, 2009SaveLearn
An index to link scientific productivity with visibilityI here propose an index that links the number of papers a researcher has published with impact factors (IFs) of the journals that publish these papers. A researcher is said to have an index z if…Ren Zhang·Dec 18, 2009SaveLearn
Optimal upper bounds for non-negative parametersUsing the techniques of [arXiv:0911.4271], upper bounds for a given confidence level are modified in an optimal fashion to incorporate the a priori information that the parameter being estimated is…Fyodor V. Tkachov·Dec 8, 2009SaveLearn
Symmetrization and enhancement of the continuous Morlet transformThe forward and inverse wavelet transform using the continuous Morlet basis may be symmetrized by using an appropriate normalization factor. The loss of response due to wavelet truncation is…Robert W. Johnson·Dec 6, 2009SaveLearn
Approximate reconstruction of bandlimited functions for the integrate and fire samplerIn this paper we study the reconstruction of a bandlimited signal from samples generated by the integrate and fire model. This sampler allows us to trade complexity in the reconstruction algorithms…Hans G. Feichtinger, José C. Príncipe, José Luis Romero et al.·Dec 4, 2009SaveLearn