Statistical Properties of the Returns of Stock Prices of International MarketsWe investigate statistical properties of daily international market indices of seven countries, and high-frequency S&P500 and KOSDAQ data, by using the detrended fluctuation method and the…GabJin Oh, Cheol-Jun Um, Seunghwan Kim·Jan 18, 2006SaveLearn
Multiple scattering and attenuation corrections in Deep Inelastic Neutron Scattering experimentsMultiple scattering and attenuation corrections in Deep Inelastic Neutron Scattering experiments are analyzed. The theoretical basis is stated, and a Monte Carlo procedure to perform the calculation…J. Dawidowski, J. J. Blostein, J. R. Granada·Jan 16, 2006SaveLearn
Teaching statistics with Excel and RDespite several deficiencies, the use of spreadsheets in statistics courses is increasingly common. In this paper we discuss many shortcomings resulting from this approach. We suggest a technique…Matteo Dell'Omodarme, Giada Valle·Jan 11, 2006SaveLearn
Modular Implementation of Particle Flow Algorithm with Minimized Dependence on the Detector GeometryA Particle Flow Algorithm (PFA) with the minimized dependence on the detector geometry is presented. Current PFA implementation includes procedures of the track reconstruction, calorimeter…A. Raspereza·Jan 11, 2006SaveLearn
The Inconstancy of the Fundamental Physical Constants: Computational StatusIt is argued that the CODATA recommended values of the fundamental physical constants could not be used as the reference data in searching the hypothetical space-time variations of the fundamental…V. V. Ezhela, Yu. V. Kuyanov, V. N. Larin et al.·Jan 11, 2006SaveLearn
Non Poisson intermittent events in price formationThe formation of price in a financial market is modelled as a chain of Ising spin with three fundamental figures of trading. We investigate the time behaviour of the model, and we compare the results…Antonella Greco, Luca Sorriso-Valvo, Vincenzo Carbone·Jan 9, 2006SaveLearn
Escape rates in periodically driven Markov processesWe present an approximate analytical expression for the escape rate of time-dependent driven stochastic processes with an absorbing boundary such as the driven leaky integrate-and-fire model for…Michael Schindler, Peter Talkner, Peter Hänggi·Jan 9, 2006SaveLearn
Identification of nonlinear noisy dynamics of an ecosystem from observations of one of its trajectory componentsThe problem of determining dynamical models and trajectories that describe observed time-series data allowing for the understanding, prediction and possibly control of complex systems in nature is of…V. N. Smelyanskiy, D. G. Luchinsky, M. Millons·Jan 2, 2006SaveLearn
On the multi-fractal structure of traded volume in financial marketsIn this pre-print we explore the multi-fractal properties of 1 minute traded volume of the equities which compose the Dow Jones 30. We also evaluate the weights of linear and non-linear dependences…L. G. Moyano, J. de Souza, S. M. Duarte Queiros·Dec 24, 2005SaveLearn
The PAX Toolkit and its Applications at Tevatron and LHCAt the CHEP03 conference we launched the Physics Analysis eXpert (PAX), a C++ toolkit released for the use in advanced high energy physics (HEP) analyses. This toolkit allows to define a level of…Steffen Kappler, Martin Erdmann, Ulrich Felzmann et al.·Dec 23, 2005SaveLearn
Escape of a Uniform Random Walk from an IntervalWe study the first-passage properties of a random walk in the unit interval in which the length of a single step is uniformly distributed over the finite range [-a,a]. For a of the order of one, the…T. Antal, S. Redner·Dec 22, 2005SaveLearn
Analysis of Rainfall records in India: Self Organized Criticality and ScalingThe time series data of the monthly rainfall records (for the time period 1871-2002) in All India and different regions of India are analyzed. It is found that the distributions of the rainfall…A. Sarkar, P. Barat·Dec 21, 2005SaveLearn
Perfect TemperingMultimodal structures in the sampling density (e.g. two competing phases) can be a serious problem for traditional Markov Chain Monte Carlo (MCMC), because correct sampling of the different…M. Daghofer, M. Konegger, H. G. Evertz et al.·Dec 19, 2005SaveLearn
Characteristic time scales of tick quotes on foreign currency markets: an empirical study and agent-based modelPower spectrum densities for the number of tick quotes per minute (market activity) on three currency markets (USD/JPY, EUR/USD, and JPY/EUR) for periods from January 1999 to December 2000 are…Aki-Hiro Sato·Dec 19, 2005SaveLearn
What is the most competitive sport?We present an extensive statistical analysis of the results of all sports competitions in five major sports leagues in England and the United States. We characterize the parity among teams by the…E. Ben-Naim, F. Vazquez, S. Redner·Dec 15, 2005SaveLearn
Spectrometer Calibration by Expectation Maximization MethodExpectation Maximization (EM) algorithm is a parameter estimation method from incomplete observations. In this paper, an implementation of this method to the calibration of HKS spectrometer at…Lulin Yuan·Dec 14, 2005SaveLearn
Large dimension forecasting models and random singular value spectraWe present a general method to detect and extract from a finite time sample statistically meaningful correlations between input and output variables of large dimensionality. Our central result is…Jean-Philippe Bouchaud, Laurent Laloux, M. Augusta Miceli et al.·Dec 10, 2005SaveLearn
First Passage Time Densities in Resonate-and-Fire ModelsMotivated by the dynamics of resonant neurons we discuss the properties of the first passage time (FPT) densities for nonmarkovian differentiable random processes. We start from an exact expression…T. Verechtchaguina, I. M. Sokolov, L. Schimansky-Geier·Dec 9, 2005SaveLearn
The Bayesian Effects in Measurement of the Asymmetry of Poisson FlowsAs it follows from the interrelation of Gamma and Poisson distributions the observed value of asymmetry for Poisson flows of events has the bias. The Monte Carlo experiment confirms the presence of…S. I. Bityukov, N. V. Krasnikov, A. Kuznetsov et al.·Dec 7, 2005SaveLearn
The Growth of Business Firms: Theoretical Framework and Empirical EvidenceWe introduce a model of proportional growth to explain the distribution of business firm growth rates. The model predicts that the distribution is exponential in the central part and depicts an…Dongfeng Fu, Fabio Pammolli, S. V. Buldyrev et al.·Dec 1, 2005SaveLearn
Efficient Data Assimilation for Spatiotemporal Chaos: a Local Ensemble Transform Kalman FilterData assimilation is an iterative approach to the problem of estimating the state of a dynamical system using both current and past observations of the system together with a model for the…Brian R. Hunt, Eric J. Kostelich, Istvan Szunyogh·Nov 28, 2005SaveLearn
Algorithm for Model Validation: Theory and ApplicationsValidation is often defined as the process of determining the degree to which a model is an accurate representation of the real world from the perspective of its intended uses. Validation is crucial…D. Sornette, A. B. Davis, K. Ide et al.·Nov 26, 2005SaveLearn
Ordering Algorithms and Confidence Intervals in the Presence of Nuisance ParametersWe discuss some issues arising in the evaluation of confidence intervals in the presence of nuisance parameters (systematic uncertainties) by means of direct Neyman construction in multi-dimensional…Giovanni Punzi·Nov 23, 2005SaveLearn
Reply to Comment on "The origin of bursts and heavy tails in human dynamics"Understanding human dynamics is of major scientific and practical importance and can be increasingly addressed in a quantitative fashion thanks to electronic records capturing various human activity…A. -L. Barabasi, K. -I. Goh, A. Vazquez·Nov 22, 2005SaveLearn
Fits, and especially linear fits, with errors on both axes, extra variance of the data points and other complicationsThe aim of this paper, triggered by some discussions in the astrophysics community raised by astro-ph/0508529, is to introduce the issue of `fits' from a probabilistic perspective (also known as…G. D'Agostini·Nov 21, 2005SaveLearn