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Data Analysis papers — page 121

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Clustering as a measure of the local topology of networks
Usual formulations of the clustering coefficient can be shown to be insufficient in the task of describing the local topology of very simple networks. Motivated by this, we review some alternatives…
Alexandre H. Abdo, A. P. S. de MouraMay 26, 2006
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A more exact solution for incorporating multiplicative systematic uncertainties in branching ratio limits
A method to include multiplicative systematic uncertainties into branching ratio limits was proposed by M. Convery. That solution used approximations which are not necessarily valid. This note…
K. StensonMay 26, 2006
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Optimal Data-Based Binning for Histograms
Histograms are convenient non-parametric density estimators, which continue to be used ubiquitously. Summary quantities estimated from histogram-based probability density models depend on the choice…
Kevin H. KnuthMay 23, 2006
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Correlated Binomial Models and Correlation Structures
We discuss a general method to construct correlated binomial distributions by imposing several consistent relations on the joint probability function. We obtain self-consistency relations for the…
M. Hisakado, K. Kitsukawa, S. MoriMay 22, 2006
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Optimal approximations of power-laws with exponentials
We propose an explicit recursive method to approximate a power-law with a finite sum of weighted exponentials. Applications to moving averages with long memory are discussed in relationship with…
Thierry Bochud, Damien ChalletMay 17, 2006
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About the proof of the so called exact classical confidence intervals. Where is the trick?
In this note I go through the `proof' of frequentistic confidence intervals and show what it logically implies concerning the value of a physical quantity given an experimental observation…
G. D'AgostiniMay 16, 2006
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Greatly enhancing the modeling accuracy for distributed parameter systems by nonlinear time/space separation
An effective modeling method for nonlinear distributed parameter systems (DPSs) is critical for both physical system analysis and industrial engineering. In this Rapid Communication, we propose a…
Hai-Tao Zhang, Chen-Kun Qi, Tao Zhou et al.May 16, 2006
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Bias-Free Estimation in Multicomponent Maximum Likelihood Fits with Component-Dependent Templates
The possibility of strong biases in a multicomponent Maximum Likelihood fits with component-dependent templates has been demonstrated in some toy problems. We discuss here in detail a problem of…
P. Catastini, G. PunziMay 16, 2006
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Comparison of weighted and unweighted histograms
Two modifications of the chi square test for comparing usual(unweighted) and weighted histograms and two weighted histograms are proposed. Numerical examples illustrate an application of the tests…
N. D. GagunashviliMay 15, 2006
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Mean number of visits to sites in Levy flights
Formulas are derived to compute the mean number of times a site has been visited during symmetric Levy flights. Unrestricted Levy flights are considered first, for lattices of any dimension:…
M. Ferraro, L. ZaninettiMay 15, 2006
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Finding community structure in networks using the eigenvectors of matrices
We consider the problem of detecting communities or modules in networks, groups of vertices with a higher-than-average density of edges connecting them. Previous work indicates that a robust approach…
M. E. J. NewmanMay 10, 2006
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Concepts, Developments and Advanced Applications of the PAX Toolkit
The Physics Analysis eXpert (PAX) is an open source toolkit for high energy physics analysis. The C++ class collection provided by PAX is deployed in a number of analyses with complex event…
S. Kappler, M. Erdmann, U. Felzmann et al.May 7, 2006
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Detecting degree symmetries in networks
The surrounding of a vertex in a network can be more or less symmetric. We derive measures of a specific kind of symmetry of a vertex which we call degree symmetry -- the property that many paths…
Petter HolmeMay 3, 2006
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Log-normal statistics in e-mail communication patterns
Following up on Barabasi's recent letter to Nature [435, 207--211 (2005)], we systematically investigate the time series of e-mail usage for 3,188 users at a university. We focus on two…
Daniel B. Stouffer, R. Dean Malmgren, Luis A. N. AmaralMay 3, 2006
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Space-Time Clustering and Correlations of Major Earthquakes
Earthquake occurrence in nature is thought to result from correlated elastic stresses, leading to clustering in space and time. We show that occurrence of major earthquakes in California correlates…
James R. Holliday, John B. Rundle, Donald L. Turcotte et al.May 1, 2006
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Wavelets and Solar Magnetic Activity I: Wavelets on the Edge
The traditional continuous wavelet transform is plagued by the cone-of-influence, ie wavelets which extend past either end of a finite timeseries return transform coefficients which tend to decrease…
Robert W. JohnsonApr 26, 2006
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Comparison of the Hirsch-index with standard bibliometric indicators and with peer judgment for 147 chemistry research groups
In this paper we present characteristics of the statistical correlation between the Hirsch (h-) index and several standard bibliometric indicators, as well as with the results of peer review…
Anthony F. J. van RaanApr 24, 2006
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Precursors of extreme increments
We investigate precursors and predictability of extreme increments in a time series. The events we are focusing on consist in large increments within successive time steps. We are especially…
Sarah Hallerberg, Eduardo G. Altmann, Detlef Holstein et al.Apr 20, 2006
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Bayesian analysis of signal deconvolution using measured instrument response functions
Using measured instrumental response functions for data deconvolution is a known source of uncertainty. This problem is revisited here with Bayesian data analysis an Monte Carlo simulations. Noise…
Pascal PernotApr 19, 2006
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Finding Scientific Gems with Google
We apply the Google PageRank algorithm to assess the relative importance of all publications in the Physical Review family of journals from 1893--2003. While the Google number and the number of…
P. Chen, H. Xie, S. Maslov et al.Apr 18, 2006
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Transcending The Least Squares
The method of quasi-optimal weights provides a comprehensive, asymptotically optimal, transparent and flexible alternative to the least squares method. The optimality holds for a general non-linear,…
Fyodor V. TkachovApr 17, 2006
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Multiscale Entropy Analysis: A New Method to Detect Determinism in a Time Series
In this letter we show that the Multiscale Entropy (MSE) analysis can detect the determinism in a time series.
A. Sarkar, P. BaratApr 5, 2006
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Spurious detection of phase synchronization in coupled nonlinear oscillators
Coupled nonlinear systems under certain conditions exhibit phase synchronization, which may change for different frequency bands or with presence of additive system noise. In both cases, Fourier…
Limei Xu, Zhi Chen, Kun Hu et al.Apr 5, 2006
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On Estimation of Hurst Scaling Exponent through Discrete Wavelets
We study the scaling behavior of the fluctuations, as extracted through wavelet coefficients based on discrete wavelets. The analysis is carried out on a variety of physical data sets, as well as…
P. Manimaran, Prasanta K. Panigrahi, Jitendra C. ParikhApr 1, 2006
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Memory Effects and Scaling Properties of Traffic Flows
Traffic flows are studied in terms of their noise of sound, which is an easily accessible experimental quantity. The sound noise data is studied making use of scaling properties of wavelet transforms…
B. -S. Skagerstam, A. HansenMar 29, 2006
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