compendia types: Published Papers(130) Journal or Magazine Articles(44) Working Papers(1) Problem Sets(1) Books(1)

research fields: Computer and Information Sciences(175) Statistics(2) Econometrics(2)

226 through 250 of 272 results

Journal of Statistical Software

Stephan J Ritter and Nicholas P Jewell and Alan E Hubbard

We describe the R package multiPIM, including statistical background, functionality and user options. The package is for variable importance analysis, and is meant primarily for analyzing data from exploratory epidemiological studies, though it could certainly be applied in other areas as well. The approach taken to variable importance comes from the causal inference field, and is different from approaches taken in other R packages. By default, multiPIM uses a double robust targeted maximum likelihood estimator (TMLE) of a parameter akin to the attributable risk. Several regression methods/machine learning algorithms are available for estimating the nuisance parameters of the models, including ...

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Image Processing On Line (2012)

Pascal Getreuer

This C source code accompanies with Image Processing On Line (IPOL) article "Rudin-Osher-Fatemi Total Variation Denoising using Split Bregman" at http://www.ipol.im/pub/algo/g_tv_denoising/ Total variation (TV) regularization is a technique for edge-preserving image restoration introduced by Rudin, Osher, and Fatemi. This code implements the TV image denoising model using the fast split Bregman algorithm of Goldstein and Osher. Three different noise models are supported (Gaussian, Laplace, and Poisson) for both grayscale and color images. Please see the readme.txt file inside for details.

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Review of Economics and Statistics

Lena Edlund, Hongbin Li, Junjian Yi, Junsen Zhang

Since the introduction of the one-child policy in China in 1979, many more boys than girls have been born, foreshadowing a sizable bride shortage. What do young men unable to find wives do? This paper focuses on criminality, an asocial activity that has seen a marked rise since the mid-1990s. Exploiting province-year level variation, we find an elasticity of crime with respect to the sex ratio of 16- to 25-year-olds of 3.4, suggesting that male sex ratios can account for one-seventh of the rise in crime. We hypothesize that adverse marriage market conditions drive this association.

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The Astrophysical Journal

Alfred J. Whitehead, Stephen L. W. McMillan, Enrico Vesperini, Simon Portegies Zwart

AMUSE is the Astrophysical Multipurpose Software Environment.

Our aim is to provide a software framework astrophysical simulations, in which existing codes from different domains, such as stellar dynamics, stellar evolution, hydrodynamics and radiative transfer can be easily coupled.

AMUSE uses Python to interface with existing numerical codes. The AMUSE interface handles unit conversions, provides consistent object oriented interfaces, manages the state of the underlying simulation codes and provides transparent distributed computing. On the examples page you can get a quick feel of how this works. AMUSE is free to download, use, and distribute and it comes with ...

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International Journal of Climatology

Joëlle Gergis, Linden Ashcroft, David Karoly

Historical meteorological observations for southeastern Australia, covering 1788–1859. The dataset contains digitised versions of 38 sources of historical temperature, rainfall and pressure information for the southeastern Australian region. It also contains monthly and seasonal anomalies of southern and eastern SEA climate variability for 1788 to 1859. A full description of the dataset and its development has been submitted to Geoscience Data Journal (http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%292049-6060).

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Proceedings of the National Academy of Sciences of the United States of America (2005)

Jared Tanner, David Donoho Coders: Jared Tanner, David Donoho

This code outputs a graphic that presents the fraction of successes in convex (LP) optimization recovering the combinatorial (NP) optimization outcomes. The equivalence phase transition is depicted as a function of the aspect ratio gamma and the sparsity through the phase transition rho. The user must specify the number of points generated, the length of the solution (n), the number of points for δ and ρ, as well as the number of trials performed to compute the fraction of equivalence. The larger the parameters specified (in particular the number of trials), the longer the code takes to run! For more ...

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Vision Research

C.R. Madan, M.L. Spetch

The spectral time-lapse (STL) algorithm is designed to be a simple and efficient technique for analyzing and presenting both spatial and temporal information of animal movements within a two-dimensional image representation. The STL algorithm re-codes an animal's position at every time point with a time-specific color, and overlaid it over a reference frame of the video, to produce a summary image. It additionally incorporates automated motion tracking, such that the animal's position can be extracted and summary statistics such as path length and duration can be calculated, as well as instantaneous velocity and acceleration. This toolbox implements the STL algorithm ...

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Medicinal chemistry

Mahendra Kumar Trivedi

Metronidazole and tinidazole are widely used antimicrobial drugs against Gram-negative and Gram-positive anaerobic bacteria. The present study was aimed to evaluate the impact of biofield treatment on metronidazole and tinidazole using FT-IR and UV spectroscopy. The study was carried out in two groups i.e. control and treatment. Treatment groups were subjected to Mr. Trivedi’s biofield treatment while no treatment was given to control group. FT-IR spectrum of treated metronidazole showed the impact of biofield treatment on frequency of characteristic functional groups such as C=C (imidazole ring) stretching was appeared at lower frequency i.e. from 1600 cm-1 to 1553 cm-1. Likewise, ...

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Journal of Pharmaceutica Analytica Acta

Mahendra Kumar Trivedi

Objective: Chloramphenicol and tetracycline are broad-spectrum antibiotics and widely used against variety of microbial infections. Nowadays, several microbes have acquired resistance to chloramphenicol and tetracycline. The present study was aimed to evaluate the impact of biofield treatment for spectroscopic characterization of chloramphenicol and tetracycline using FT-IR and UV-Vis spectroscopy.

Methods:The study was performed in two groups (control and treatment) of each antibiotic. The control groups remained as untreated, and biofield treatment was given to treatment groups.

Results: FT-IR spectrum of treated chloramphenicol exhibited the decrease in wavenumber of NO2 from 1521 cm-1 to 1512 cm-1 and increase in wavenumber of ...

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Journal of Transportation and Statistics

Gary G. Gavis and Gujay Gavuluri and Gianping Gei

In the United States, the imposition and subsequent repeal of the 55 mph speed limit has led to an energetic debate on the relationship between speed and the risk of being in a (fatal) crash. In addition, research done in the 1960s and 1970s suggested that crash risk is a U-shaped function of speed, with risk increasing as one travels both faster and slower than what is average on a road. This paper describes two case-control analyses of run-off-road crashes, one using data collected in Adelaide, Australia, and the other using data from Minnesota. In both analyses the speeds of ...

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John Snow

The map used by Dr. John Snow to identify the source of the 1854 cholera outbreak in London.

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Transactions on Information Theory (2006)

Michael Elad, Vladimir Temlyakov, David Donoho Coders: Michael Elad, Vladimir Temlyakov, David Donoho

This code studies the stability of various algorithms in finding sparse representations in the presence of noise. In particular, the l^1 method and the orthogonal greedy algorithm are proposed. And for each method, the figures obtained depict the representation error and signal error represented as a function of the noise level, as well as the support recovery success (in percent). The inputs required are the length of the signal and the number of trials. For more information, please visit the SparseLab (Seeking Sparse Solutions to Linear Systems of Equations) website (http://sparselab.stanford.edu/).

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Duke University

Professor David Banks

In this course we learn about the use of probability and statistics in the natural and social sciences, and for public policy. The course requires a basic knowledge of simple calculus, including double integration. It is more advanced that STA 101; in particular, for those majoring in Economics, STA 111 is preferred.

The course will cover the following topics:

  • Linear and nonlinear regression
  • Probability models
  • Risk analysis
  • Hypothesis testing
  • Estimation

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F1000Research

Ricardo H. Ramirez-Gonzalez, Richard M. Leggett, Darren Waite, Anil Thanki, Nizar Drou, Mario Caccamo, Robert Davey

StatsDB is an open-source software package for storage and analysis of next generation sequencing run metrics, allowing consolidated multi-faceted querying and visualisation of QC and primary analysis data via concise APIs in Java and Perl.

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PLoS ONE

Konrad J. Karczewski, Guy Haskin Fernald, Alicia R. Martin, Michael Snyder, Nicholas P. Tatonetti, Joel T. Dudley, I. King Jordan

The increasing public availability of personal complete genome sequencing data has ushered in an era of democratized genomics. However, read mapping and variant calling software is constantly improving and individuals with personal genomic data may prefer to customize and update their variant calls. Here, we describe STORMSeq (Scalable Tools for Open-Source Read Mapping), a graphical interface cloud computing solution that does not require a parallel computing environment or extensive technical experience. This customizable and modular system performs read mapping, read cleaning, and variant calling and annotation. At present, STORMSeq costs approximately $2 and 5–10 hours to process a full exome ...

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Molecular Pharmaceutics & Organic Process Research

Mahendra Kumar Trivedi

Thymol and menthol are naturally occurring plant derived compounds, which have excellent pharmaceutical and antimicrobial applications. The aim of this work was to evaluate the impact of biofield energy on physical and structural characteristics of thymol and menthol. The control and biofield treated compounds (thymol and menthol) were characterized by X-ray diffraction (XRD), Differential Scanning Calorimetry (DSC), Thermogravimetric analysis (TGA), and Fourier Transform Infrared Spectroscopy (FT-IR). XRD study revealed increase in intensity of the XRD peaks of treated thymol, which was correlated to high crystallinity of the treated sample. The treated thymol showed significant increase in crystallite size by 50.01% ...

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Economic Modelling (2011)

George M. Lady, Andrew J. Buck Coders: George M. Lady, Andrew J. Buck

This program is a Monte Carlo simulation of reduced form sign patterns based upon structural sign patterns specified by the user. The basic purpose of the program is to determine if a proposed reduced form sign pattern could possibly be generated by the proposed structural sign patterns. The application was compiled in Visual Studio 6 to run under the Windows operating system. This software was used in support of the work reported on in: - Lady, George and Andrew Buck (2011). "Structural Models, Information and Inherited Restrictions", Economic Modelling, 28, pp. 2820-2831.. - Buck, Andrew and George Lady (2012)."Structural Sign ...

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Economic Modelling (2012)

George M. Lady, Andrew J. Buck Coders: George M. Lady, Andrew J. Buck

This program is a Monte Carlo simulation of reduced form sign patterns based upon structural sign patterns specified by the user. The basic purpose of the program is to determine if a proposed reduced form sign pattern could possibly be generated by the proposed structural sign patterns. The application was compiled in Visual Studio 6 to run under the Windows operating system. This software was used in support of the work reported on in: - Lady, George and Andrew Buck (2011). "Structural Models, Information and Inherited Restrictions", Economic Modelling, 28, pp. 2820-2831.. - Buck, Andrew and George Lady (2012)."Structural Sign ...

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Industrial Engineering & Management

Mahendra Kumar Trivedi, Alice Branton, Dahryn Trivedi, Gopal Nayak

Transition metal oxides (TMOs) have been known for their extraordinary electrical and magnetic properties. In the present study, some transition metal oxides (Zinc oxide, iron oxide and copper oxide) which are widely used in the fabrication of electronic devices were selected and subjected to biofield treatment. The atomic and crystal structures of TMOs were carefully studied by Fourier transform infrared (FT-IR) spectroscopy and X-ray diffraction (XRD) studies. XRD analysis reveals that biofield treatment significantly changed the lattice strain in unit cells, crystallite sizes and densities in ceramics oxide powders. The computed molecular weight of the treated samples exhibited significant variation. ...

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Chemical Communications

Jonathan L. Sessler, Evgeny Katayev, G. Dan Pantos, Yuri A. Ustynyuk

A new 2,6-diamidopyridinedipyrromethane hybrid macrocycle has been synthesized that shows a high selectivity for dihydrogen phosphate and hydrogen sulfate relative to nitrate in acetonitrile solution as judged from UV-vis spectrophotometric titrations; this leads to the suggestion that this or related systems might find use in nuclear waste remediation applications requiring the selective removal of hydrogensulfate from nitrate-rich waste mixtures.

Synthesis and study of a new diamidodipyrromethane macrocycle. An anion receptor with a high sulfate-to-nitrate binding selectivityElectronic supplementary information (ESI) available: detailed experimental data and UV-vis spectrophotometric titration data. See http://www.rsc.org/suppdata/cc/b4/b403665d/

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Proceedings of the National Academy of Sciences

E. Neftci, J. Binas, U. Rutishauser, E. Chicca, G. Indiveri, R. J. Douglas

The quest to implement intelligent processing in electronic neuromorphic systems lacks methods for achieving reliable behavioral dynamics on substrates of inherently imprecise and noisy neurons. Here we report a solution to this problem that involves first mapping an unreliable hardware layer of spiking silicon neurons into an abstract computational layer composed of generic reliable subnetworks of model neurons and then composing the target behavioral dynamics as a “soft state machine” running on these reliable subnets. In the first step, the neural networks of the abstract layer are realized on the hardware substrate by mapping the neuron circuit bias voltages to ...

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Chinese Journal of Astronomy and Astrophysics

G Hobbs, R Edwards, R Manchester

TEMPO2 is a new pulsar timing package that provides the precision necessary for modern millisecond timing projects and should supersede all existing pulsar timing packages such as TEMPO and PSRTIME. As TEMPO2 is the only program available that can analyse multiple pulsar datasets simultaneously it will become an integral part of pulsar timing array projects which aim to detect the signatures of gravitational radiation in pulsar timing residuals. In this paper we describe the basic functionality of TEMPO2.

The software and documentation for TEMPO2 can be obtained from our web-site, http://www.atnf.csiro.au/research/pulsar/tempo2.

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Atmospheric Chemistry and Physics

A. M. Batenburg, S. Walter, G. Pieterse, I. Levin, M. Schmidt, A. Jordan, S. Hammer, C. Yver, T. Röckmann

These are the H2 mixing ratio and deuterium content data used in: Batenburg, A. M., Walter, S., Pieterse, G., Levin, I., Schmidt, M., Jordan, A., Hammer, S., Yver, C., and Röckmann, T.: Temporal and spatial variability of the stable isotopic composition of atmospheric molecular hydrogen: observations at six EUROHYDROS stations, Atmos. Chem. Phys., 11, 6985-6999, doi:10.5194/acp-11-6985-2011

Please cite this ACP article when using these data in a publication, and kindly notify the first author (annekebatenburg'at'gmail.com).

In the CSV files: * Mixing ratios are reduction gas analyzer results obtained at UHEI-IUP, MPI-BGC and LSCE.

  • dD(H2) data are obtained from ...

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Economic Modelling (2011)

Furkan Emirmahmutoglu, Nezir Kose

This code is written to test panel causality which is valid the following cases: 1) The test is valid for four different DGPs in mixed panels involving I(0), I(1), cointegrated and non-cointegrated series. 2) The lag lengths on autoregressive coefficients and exogenous variables can be different for cross-section units. 3) Time periods of each unit should not be same. 4) To prevent cross-section dependency problem, we obtain emprical distribution of the Fisher Test statistic using Bootstrap procedure.

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226 through 250 of 272 results