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)

126 through 150 of 272 results

Journal of Financial Economics (2012)

Philip Valta

This code was used to generate the tables in the paper "Competition and the Cost of Debt", Journal of Financial Economics 105, 2012.

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Handbook of Financial Time Series, Springer Verlag (2009)

Andrew J. Patton

This code estimates a dozen constant and time-varying copula functions for bivariate time-series (e.g. Normal, Clayton, Rotates Clayton, Plackett, Frank, Gumbel, Rotated Gumbel, Student, Symmetrised Joe-Clayton). These copulas are then compared by relying on criteria such as Log-likelihood, AIC or BIC. Besides, the code reports the plots for exceedence correlations, quantile dependence and the graphical comparison of the constant and the time-varying versions of three copulas, i.e. Normal, Gumbel and SJC. For the constant copulas, the level of tail dependence (Ldep and Udep) is also indicated.

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WWU Muenster (2013)

Christian Himpe, Mario Ohlberger

The juq function verifies and tests the empirical gramians computed by the emgr framework as described in the paper. running juq; prints only the error table after computations finished, juq(1); also plots the error in outputs and juq(2); additionally saves these plots. Main and auxiliary code are compatible with MATLAB and OCTAVE and are licensed under the 2-clause (simplified) BSD license.

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F1000Research

Ilya Minkin, Hoa Pham, Ekaterina Starostina, Nikolay Vyahhi, Son Pham

We present C-Sibelia, a highly accurate and easy-to-use software tool for comparing two closely related bacterial genomes, which can be presented as either finished sequences or fragmented assemblies. C-Sibelia takes as input two FASTA files and produces: (1) a VCF file containing all identified single nucleotide variations and indels; (2) an XMFA file containing alignment information. The software also produces Circos diagrams visualizing high level genomic architecture for rearrangement analyses. C-Sibelia is a part of the Sibelia comparative genomics suite, which is freely available under the GNU GPL v.2 license at http://sourceforge.net/projects/sibelia-bio. C-Sibelia is compatible with Unix-like operating systems. ...

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Cambridge University Press

Andrew Gelman, Jennifer Hill

Data Analysis Using Regression and Multilevel/Hierarchical Models is a comprehensive manual for the applied researcher who wants to perform data analysis using linear and nonlinear regression and multilevel models. The book introduces a wide variety of models, whilst at the same time instructing the reader in how to fit these models using available software packages. The book illustrates the concepts by working through scores of real data examples that have arisen from the authors’ own applied research, with programming codes provided for each one. Topics covered include causal inference, including regression, post stratification, matching, regression discontinuity, and instrumental variables, as ...

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Science Translational Medicine

N. P. Tatonetti, P. P. Ye, R. Daneshjou, R. B. Altman

Adverse drug events remain a leading cause of morbidity and mortality around the world. Many adverse events are not detected during clinical trials before a drug receives approval for use in the clinic. Fortunately, as part of postmarketing surveillance, regulatory agencies and other institutions maintain large collections of adverse event reports, and these databases present an opportunity to study drug effects from patient population data. However, confounding factors such as concomitant medications, patient demographics, patient medical histories, and reasons for prescribing a drug often are uncharacterized in spontaneous reporting systems, and these omissions can limit the use of quantitative signal ...

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FBI

Reference: Vandaele, W. (1978) Participation in illegitimate activities: Erlich revisited. In Deterrence and incapacitation, Blumstein, A., Cohen, J. and Nagin, D., eds., Washington, D.C.: National Academy of Sciences, 270-335. Methods: A Primer, New York: Chapman & Hall, 11. Also found in: Hand, D.J., et al. (1994) A Handbook of Small Data Sets, London: Chapman & Hall, 101-103.

Authorization: Contact author

Description: These data are crime-related and demographic statistics for 47 US states in 1960. The data were collected from the FBI's Uniform Crime Report and other government agencies to determine how the variable crime rate depends on the other variables ...

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F1000Research

Carly Strasser, John Kunze, Stephen Abrams, Patricia Cruse

The DataUp source code package includes three components: (1) the Excel add-in; (2) the public web client; and (3) the private web service that mediates between the add-in and client and the ONEShare repository. All code is written in C# and relies on the .NET framework.

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Electoral Studies

Matt Golder

This article describes a new data set that covers the electoral institutions used in all of the democratic legislative and presidential elections in 199 countries between 1946 (or independence) and 2000. A clear and consistent classification of the electoral institutions used in these elections is followed by a concise geographical and temporal analysis. The worldwide focus of the data set reveals several striking patterns. For example, there have been almost as many elections under dictatorship as there have been under democracy. Other patterns include the fact that presidential regimes nearly always employ proportional electoral formulas, absolute majority rule has become ...

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Journal of Neurophysiology (2003)

David Brown, Andrew Davison, Jianfeng Feng

This is a model of the mammalian olfactory bulb for the NEURON simulator. The model contains only mitral and granule cells. It is intended that the properties of the network can be explored by changing the files parameters_[HTML_REMOVED].hoc and experiment_[HTML_REMOVED].hoc. It should not be necessary to change the other files. After compiling the mod files, start the simulation by running init.hoc Type show_results() if after running the odour stimulus simulation the mitral cell spike time histogram graph is empty.

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Science

D. N. Reshef, Y. A. Reshef, H. K. Finucane, S. R. Grossman, G. McVean, P. J. Turnbaugh, E. S. Lander, M. Mitzenmacher, P. C. Sabeti

Identifying interesting relationships between pairs of variables in large data sets is increasingly important. Here, we present a measure of dependence for two-variable relationships: the maximal information coefficient (MIC). MIC captures a wide range of associations both functional and not, and for functional relationships provides a score that roughly equals the coefficient of determination (R2) of the data relative to the regression function. MIC belongs to a larger class of maximal information-based nonparametric exploration (MINE) statistics for identifying and classifying relationships. We apply MIC and MINE to data sets in global health, gene expression, major-league baseball, and the human gut ...

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Science Journal of Analytical Chemistry

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

1-Chloro-3-nitrobenzene (3-CNB) is an aromatic halo-amine compound used as chemical intermediate for the production of several fine chemicals like pharmaceuticals, dyes, agricultural chemicals, etc. The stable isotope ratio analysis has drawn attention in numerous fields such as agricultural, food authenticity, biochemistry, etc. The objective of the current research was to investigate the impact of the biofield energy treatment on the isotopic abundance ratios of PM+1/PM, PM+2/PM and PM+3/PM in 3-CNB using gas chromatography - mass spectrometry (GC-MS). The sample, 3-CNB was divided into two parts - one part was denoted as control and another part was referred as biofield energy ...

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Modern Chemistry

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

The objective of the current study was to evaluate the effect of biofield energy treatment on the isotopic abundance ratios of PM+1/PM, PM+2/PM, PM+3/PM and PM+4/PM in p-DCB using gas chromatography-mass spectrometry (GC-MS). The p-DCB was divided into two parts - one part was control sample, and another part was considered as the treated sample which was subjected to biofield energy treatment (The Trivedi Effect®). T1, T2, T3, and T4 were referred the biofield treated p-DCB having analyzed at different time intervals. The GC-MS analysis of both the control and biofield treated p-DCB indicated the presence of the parent molecular ...

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Stanford University (2012)

Sina Jafarpour, Matan Gavish, Hatef Monajemi, David Donoho Coders: Hatef Monajemi, David Donoho

This code generates the figures in the paper "Deterministic Matrices Matching the Compressed Sensing Phase Transitions of Gaussian Random Matrices" by H. Monajemi, S. Jafarpour, Stat330/CME362 Collaboration, M. Gavish, and D. L. Donoho

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BMJ

J. Hippisley-Cox, C. Coupland

Derive and validate a new clinical risk prediction algorithm QThrombosis to estimate individual patients’ risk of venous thromboembolism.

The derivation cohort included 14 756 incident cases of venous thromboembolism from 10 095 199 person years of observation (rate of 14.6 per 10 000 person years). The validation cohort included 6913 incident cases from 4 632 694 person years of observation (14.9 per 10 000 person years).

We have developed and validated a new risk prediction model that quantifies absolute risk of thrombosis at 1 and 5 years. It can help identify patients at high risk of venous thromboembolism for ...

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Nature Biotechnology

Cole Trapnell, David G Hendrickson, Martin Sauvageau, Loyal Goff, John L Rinn, Lior Pachter

Differential analysis of gene and transcript expression using high-throughput RNA sequencing (RNA-seq) is complicated by several sources of measurement variability and poses numerous statistical challenges. We present Cuffdiff 2, an algorithm that estimates expression at transcript-level resolution and controls for variability evident across replicate libraries. Cuffdiff 2 robustly identifies differentially expressed transcripts and genes and reveals differential splicing and promoter-preference changes. We demonstrate the accuracy of our approach through differential analysis of lung fibroblasts in response to loss of the developmental transcription factor HOXA1, which we show is required for lung fibroblast and HeLa cell cycle progression. Loss of HOXA1 ...

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Cell Biology

Zhuqing Qu-Petersen

Identification of multipotent progenitors has been difficult due to their rarity in adults. Here, we report a novel type of neuroepithelial myogenic progenitor that can be isolated from adult murine skeletal muscle. In culture, these progenitors generated radial glia-like cells that initiated mosaic myotubes, and subsequently developed into embryonic/fetal- like myoblasts capable of robust myofiber formation. These cells could also differentiate into neuronal lineage. By contrast, progenitors from bone marrow produced progenies more uniformly of an adult myoblast lineage. When grafted into dystrophic muscles of mdx mice, the muscle- and marrow-derived cells restored dystrophin expression; however, fetal-like myogenesis towards a ...

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The Journal of Law, Economics, & Organization (2006)

Hasung Jang, Bernard S Black, Woochan Kim Coders: Hasung Jang, Bernard S Black, Woochan Kim

This code allows the user evaluating the robustness of the relationship found between an overall corporate governance index and the market value of Korean public companies. The sample includes 515 Korean companies based on a 2001 Korea Stock Exchange survey (the dataset can be downloaded). The user can choose the dependent variable (Tobin’s q, Market / Book, Market / Sales) and a set of control explicative variables. The corporate governance index (KCGI) is systemically introduced in the specification. The user can also define some restrictions on the sample used (see, Table 5, page 382). The code systematically displays both OLS ...

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F1000Research

N Lally, CL Nord, V Walsh, JP Roiser

N-back task code (d prime version for probing 3-back, including training). Coded in Matlab (release 2008b for Windows; Mathworks, Natick, MA, USA) using the Cogent Toolbox.

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Journal of Clinical Oncology

C. Capalbo, A. Buffone, A. Vestri, E. Ricevuto, C. Rinaldi, M. Zani, S. Ferraro, L. Frati, I. Screpanti, A. Gulino, G. Giannini

BRCAPRO is a statistical model, with associated software, for assessing the probability that an individual carries a germline deleterious mutation of the BRCA1 and BRCA2 genes, based on family history of breast and ovarian cancer, based on his or her family's history of breast and ovarian cancer, including male breast cancer and bilateral synchronous and asynchronous diagnoses. BRCAPRO uses a Mendelian approach that assumes autosomal dominant inheritance. This assumption is supported extensively by previous linkage analyses. Age-dependent penetrances and prevalences are based on a systematic review of the literature. BRCAPRO was originally developed as part of the Duke SPORE in ...

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Science

N. Coltice, T. Rolf, P. J. Tackley, S. Labrosse

The distribution of seafloor ages determines fundamental characteristics of Earth such as sea level, ocean chemistry, tectonic forces, and heat loss from the mantle. The present-day distribution suggests that subduction affects lithosphere of all ages, but this is at odds with the theory of thermal convection that predicts that subduction should happen once a critical age has been reached. We used spherical models of mantle convection to show that plate-like behavior and continents cause the seafloor area-age distribution to be representative of present-day Earth. The distribution varies in time with the creation and destruction of new plate boundaries. Our simulations ...

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The Journal of Neuroscience

L. Q. Uddin, K. S. Supekar, S. Ryali, V. Menon

Using functional and effective connectivity measures applied to fMRI data, we examine interactions within and between the SN, CEN, and DMN. We find that functional coupling between key network nodes is stronger in adults than in children, as are causal links emanating from the rFIC. Specifically, the causal influence of the rFIC on nodes of the SN and CEN was significantly greater in adults compared with children. Notably, these results were entirely replicated on an independent dataset of matched children and adults. Developmental changes in functional and effective connectivity were related to structural connectivity along these links. Diffusion tensor imaging ...

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Chemical Sciences Journal

Mahendra Kumar Trivedi

Paracetamol and piroxicam are non-steroidal anti-inflammatory drugs (NSAIDs), widely used in pain and inflammatory diseases. The present study aimed to evaluate the impact of biofield treatment on spectral properties of paracetamol and piroxicam. The study was performed in two groups (control and treatment) of each drug. The control groups remained as untreated, and biofield treatment was given to treatment groups. Subsequently, spectral properties of both drugs before and after biofield treatment were characterized using FT-IR and UV-Vis spectroscopic techniques. FT-IR data of paracetamol showed N-H amide II bending peak in biofield treated paracetamol, which was shifted to lower wavenumber (1565 ...

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Journal of Powder Metallurgy & Mining

Mahendra Kumar Trivedi

Silicon carbide (SiC) is a well-known ceramic due to its excellent spectral absorbance and thermo-mechanical properties. The wide band gap, high melting point and thermal conductivity of SiC is used in high temperature applications. The present study was undertaken to investigate the effect of biofield treatment on physical, atomic, and structural characteristics of SiC powder. The control and biofield treated SiC powder was analysed using X-ray diffraction (XRD), particle size analyzer, surface area analyzer, and Fourier transform infrared (FT-IR) spectroscopy techniques with respect to control. The XRD pattern revealed that crystallite size was significantly increased by 40% in treated SiC ...

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PLoS ONE

Nicholas G. Reich, Jessica A. Myers, Daniel Obeng, Aaron M. Milstone, Trish M. Perl, Sten H. Vermund

In recent years, the number of studies using a cluster-randomized design has grown dramatically. In addition, the cluster-randomized crossover design has been touted as a methodological advance that can increase efficiency of cluster-randomized studies in certain situations. While the cluster-randomized crossover trial has become a popular tool, standards of design, analysis, reporting and implementation have not been established for this emergent design. We address one particular aspect of cluster-randomized and cluster-randomized crossover trial design: estimating statistical power. We present a general framework for estimating power via simulation in cluster-randomized studies with or without one or more crossover periods. We have ...

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126 through 150 of 272 results