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  • An explicit mean-covariance parameterization for multivariate response linear regression
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-11-23
    Aaron J. Molstad; Guangwei Weng; Charles R. Doss; Adam J. Rothman

    Abstract We develop a new method to fit the multivariate response linear regression model that exploits a parametric link between the regression coefficient matrix and the error covariance matrix. Specifically, we assume that the correlations between entries in the multivariate error random vector are proportional to the cosines of the angles between their corresponding regression coefficient matrix

    更新日期:2020-11-25
  • Additive Functional Cox Model
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-11-23
    Erjia Cui; Ciprian M. Crainiceanu; Andrew Leroux

    Abstract We propose the Additive Functional Cox Model to flexibly quantify the association between functional covariates and time to event data. The model extends the linear functional proportional hazards model by allowing the association between the functional covariate and log hazard to vary non-linearly in both the functional domain and the value of the functional covariate. Additionally, we introduce

    更新日期:2020-11-25
  • Change point detection for graphical models in the presence of missing values
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-11-23
    Malte Londschien; Solt Kovács; Peter Bühlmann

    Abstract We propose estimation methods for change points in high-dimensional covariance structures with an emphasis on challenging scenarios with missing values. We advocate three imputation like methods and investigate their implications on common losses used for change point detection. We also discuss how model selection methods have to be adapted to the setting of incomplete data. The methods are

    更新日期:2020-11-25
  • Kriging Riemannian Data via Random Domain Decompositions
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-11-20
    Alessandra Menafoglio; Davide Pigoli; Piercesare Secchi

    Abstract Data taking value on a Riemannian manifold and observed over a complex spatial domain are becoming more frequent in applications, e.g. in environmental sciences and in geoscience. The analysis of these data needs to rely on local models to account for the non stationarity of the generating random process, the nonlinearity of the manifold and the complex topology of the domain. In this paper

    更新日期:2020-11-21
  • MIP-BOOST: Efficient and Effective L 0 Feature Selection for Linear Regression
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-11-17
    Ana Kenney; Francesca Chiaromonte; Giovanni Felici

    Abstract Recent advances in mathematical programming have made Mixed Integer Optimization a competitive alternative to popular regularization methods for selecting features in regression problems. The approach exhibits unquestionable foundational appeal and versatility, but also poses important challenges. Here we propose MIP-BOOST, a revision of standard Mixed Integer Programming feature selection

    更新日期:2020-11-17
  • LowCon: A design-based subsampling approach in a misspecified linear model
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-11-02
    Cheng Meng; Rui Xie; Abhyuday Mandal; Xinlian Zhang; Wenxuan Zhong; Ping Ma

    Abstract We consider a measurement constrained supervised learning problem, that is, (1) full sample of the predictors are given; (2) the response observations are unavailable and expensive to measure. Thus, it is ideal to select a subsample of predictor observations, measure the corresponding responses, and then fit the supervised learning model on the subsample of the predictors and responses. However

    更新日期:2020-11-03
  • Nonparametric Anomaly Detection on Time Series of Graphs
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-11-02
    Dorcas Ofori-Boateng; Yulia R. Gel; Ivor Cribben

    Abstract Identifying change points and/or anomalies in dynamic network structures has become increasingly popular across various domains, from neuroscience to telecommunication to finance. One of the particular objectives of the anomaly detection task from the neuroscience perspective is the reconstruction of the dynamic manner of brain region interactions. However, most statistical methods for detecting

    更新日期:2020-11-03
  • Modeling non-stationary extreme dependence with stationary max-stable processes and multidimensional scaling
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-11-02
    Clément Chevalier; Olivia Martius; David Ginsbourger

    Abstract Modeling the joint distribution of extreme events at multiple locations is a challenging task with important applications. In this study, we use max-stable models to study extreme daily precipitation events in Switzerland. The non-stationarity of the spatial process at hand involves important challenges, which are often dealt with by using a stationary model in a so-called climate space, with

    更新日期:2020-11-03
  • Scalable Algorithms for Large Competing Risks Data
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-10-29
    Eric S. Kawaguchi; Jenny I. Shen; Marc A. Suchard; Gang Li

    Abstract This paper develops two orthogonal contributions to scalable sparse regression for competing risks time-to-event data. First, we study and accelerate the broken adaptive ridge method (BAR), a surrogate ℓ 0-based iteratively reweighted ℓ 2-penalization algorithm that achieves sparsity in its limit, in the context of the Fine-Gray (1999) proportional subdistributional hazards (PSH) model. In

    更新日期:2020-10-30
  • Particle MCMC with Poisson Resampling: Parallelization and Continuous Time Models
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-10-26
    Tomasz Cakala; Blazej Miasojedow; Wojciech Niemiro

    Abstract We introduce a new version of particle filter in which the number of “children” of a particle at a given time has a Poisson distribution. As a result, the number of particles is random and varies with time. An advantage of this scheme is that descendants of different particles can evolve independently. It makes easy to parallelize computations. Moreover, particle filter with Poisson resampling

    更新日期:2020-10-30
  • Bayesian Variable Selection for Gaussian copula regression models
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-10-26
    A. Alexopoulos; L. Bottolo

    Abstract We develop a novel Bayesian method to select important predictors in regression models with multiple responses of diverse types. A sparse Gaussian copula regression model is used to account for the multivariate dependencies between any combination of discrete and/or continuous responses and their association with a set of predictors. We utilize the parameter expansion for data augmentation

    更新日期:2020-10-30
  • Penalized Quantile Regression for Distributed Big Data Using the Slack Variable Representation
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-10-26
    Ye Fan; Nan Lin; Xianjun Yin

    Abstract Penalized quantile regression is a widely used tool for analyzing high-dimensional data with heterogeneity. Although its estimation theory has been well studied in the literature, its computation still remains a challenge in big data, due to the nonsmoothness of the check loss function and the possible nonconvexity of the penalty term. In this paper, we propose the QPADM-slack method, a parallel

    更新日期:2020-10-30
  • Likelihood Evaluation of Jump-Diffusion Models Using Deterministic Nonlinear Filters*
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-10-26
    Jean-François Bégin; Mathieu Boudreault

    Abstract In this study, we develop a deterministic nonlinear filtering algorithm based on a high-dimensional version of Kitagawa (1987) to evaluate the likelihood function of models that allow for stochastic volatility and jumps whose arrival intensity is also stochastic. We show numerically that the deterministic filtering method is precise and much faster than the particle filter, in addition to

    更新日期:2020-10-30
  • Local Linear Forests
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-10-15
    Rina Friedberg; Julie Tibshirani; Susan Athey; Stefan Wager

    Abstract Random forests are a powerful method for non-parametric regression, but are limited in their ability to fit smooth signals. Taking the perspective of random forests as an adaptive kernel method, we pair the forest kernel with a local linear regression adjustment to better capture smoothness. The resulting procedure, local linear forests, enables us to improve on asymptotic rates of convergence

    更新日期:2020-10-16
  • Markov Chain Importance Sampling – a highly efficient estimator for MCMC
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-09-28
    Ingmar Schuster; Ilja Klebanov

    Abstract Markov chain (MC) algorithms are ubiquitous in machine learning and statistics and many other disciplines. Typically, these algorithms can be formulated as acceptance rejection methods. In this work we present a novel estimator applicable to these methods, dubbed Markov chain importance sampling (MCIS), which efficiently makes use of rejected proposals. For the unadjusted Langevin algorithm

    更新日期:2020-09-28
  • Asymptotically exact data augmentation: models, properties and algorithms
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-09-28
    Maxime Vono; Nicolas Dobigeon; Pierre Chainais

    Abstract Data augmentation, by the introduction of auxiliary variables, has become an ubiquitous technique to improve convergence properties, simplify the implementation or reduce the computational time of inference methods such as Markov chain Monte Carlo ones. Nonetheless, introducing appropriate auxiliary variables while preserving the initial target probability distribution and offering a computationally

    更新日期:2020-09-28
  • Non-reversible jump algorithms for Bayesian nested model selection
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-09-28
    Philippe Gagnon; Arnaud Doucet

    Abstract Non-reversible Markov chain Monte Carlo methods often outperform their reversible counterparts in terms of asymptotic variance of ergodic averages and mixing properties. Lifting the state-space (Chen et al., 1999; Diaconis et al., 2000) is a generic technique for constructing such samplers. The idea is to think of the random variables we want to generate as position variables and to associate

    更新日期:2020-09-28
  • d-blink: Distributed End-to-End Bayesian Entity Resolution
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-09-23
    Neil G. Marchant; Andee Kaplan; Daniel N. Elazar; Benjamin I. P. Rubinstein; Rebecca C. Steorts

    Entity resolution (ER; also known as record linkage or de-duplication) is the process of merging noisy databases, often in the absence of unique identifiers. A major advancement in ER methodology has been the application of Bayesian generative models, which provide a natural framework for inferring latent entities with rigorous quantification of uncertainty. Despite these advantages, existing models

    更新日期:2020-09-24
  • A Slice Tour for Finding Hollowness in High-Dimensional Data
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-07-16
    Ursula Laa; Dianne Cook; German Valencia

    Taking projections of high-dimensional data is a common analytical and visualization technique in statistics for working with high-dimensional problems. Sectioning, or slicing, through high dimensions is less common, but can be useful for visualizing data with concavities, or nonlinear structure. It is associated with conditional distributions in statistics, and also linked brushing between plots in

    更新日期:2020-09-23
  • Assessing and Visualizing Simultaneous Simulation Error
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-09-18
    Nathan Robertson; James M. Flegal; Dootika Vats; Galin L. Jones

    Monte Carlo experiments produce samples in order to estimate features such as means and quantiles of a given distribution. However, simultaneous estimation of means and quantiles has received little attention. In this setting we establish a multivariate central limit theorem for any finite combination of sample means and quantiles under the assumption of a strongly mixing process, which includes the

    更新日期:2020-09-20
  • Simultaneous Dimensionality and Complexity Model Selection for Spectral Graph Clustering
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-09-16
    Congyuan Yang; Carey E. Priebe; Youngser Park; David J. Marchette

    Our problem of interest is to cluster vertices of a graph by identifying underlying community structure. Among various vertex clustering approaches, spectral clustering is one of the most popular methods because it is easy to implement while often outperforming more traditional clustering algorithms. However, there are two inherent model selection problems in spectral clustering, namely estimating

    更新日期:2020-09-16
  • Boosting Random Forests to Reduce Bias; One-Step Boosted Forest and its Variance Estimate
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-09-11
    Indrayudh Ghosal; Giles Hooker

    In this paper we propose using the principle of boosting to reduce the bias of a random forest prediction in the regression setting. From the original random forest fit we extract the residuals and then fit another random forest to these residuals. We call the sum of these two random forests a one-step boosted forest. We show with simulated and real data that the one-step boosted forest has a reduced

    更新日期:2020-09-12
  • Global Consensus Monte Carlo
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-09-08
    Lewis J. Rendell; Adam M. Johansen; Anthony Lee; Nick Whiteley

    To conduct Bayesian inference with large data sets, it is often convenient or necessary to distribute the data across multiple machines. We consider a likelihood function expressed as a product of terms, each associated with a subset of the data. Inspired by global variable consensus optimisation, we introduce an instrumental hierarchical model associating auxiliary statistical parameters with each

    更新日期:2020-09-08
  • Model-based edge clustering
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-09-04
    Daniel K. Sewell

    Relational data can be studied using network analytic techniques which define the network as a set of actors and a set of edges connecting these actors. One important facet of network analysis that receives significant attention is community detection. However, while most community detection algorithms focus on clustering the actors of the network, it is very intuitive to cluster the edges. Connections

    更新日期:2020-09-05
  • An Exact Auxiliary Variable Gibbs Sampler for a Class of Diffusions
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-09-01
    Qi Wang; Vinayak Rao; Yee Whye Teh

    Stochastic differential equations (SDEs) or diffusions are continuous-valued continuous-time stochastic processes widely used in the applied and mathematical sciences. Simulating paths from these processes is usually an intractable problem, and typically involves time-discretization approximations. We propose an exact Markov chain Monte Carlo sampling algorithm that involves no such time-discretization

    更新日期:2020-09-02
  • Improving Bayesian Local Spatial Models in Large Data Sets
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-09-01
    Amanda Lenzi; Stefano Castruccio; Håvard Rue; Marc G. Genton

    Environmental processes resolved at a sufficiently small scale in space and time inevitably display non-stationary behavior. Such processes are both challenging to model and computationally expensive when the data size is large. Instead of modeling the global non-stationarity explicitly, local models can be applied to disjoint regions of the domain. The choice of the size of these regions is dictated

    更新日期:2020-09-02
  • Shrinking the Covariance Matrix using Convex Penalties on the Matrix-Log Transformation
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-09-01
    Mengxi Yi; David E. Tyler

    For q-dimensional data, penalized versions of the sample covariance matrix are important when the sample size is small or modest relative to q. Since the negative log-likelihood under multivariate normal sampling is convex in Σ−1, the inverse of the covariance matrix, it is common to consider additive penalties which are also convex in Σ−1. More recently, Deng and Tsui (2013) and Yu et al. (2017) have

    更新日期:2020-09-02
  • Quantum Annealing via Path-Integral Monte Carlo with Data Augmentation
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-09-01
    Jianchang Hu; Yazhen Wang

    This paper considers quantum annealing in the Ising framework for solving combinatorial optimization problems. The path-integral Monte Carlo simulation approach is often used to approximate quantum annealing and implement the approximation by classical computers, which refers to simulated quantum annealing. In this paper we introduce a data augmentation scheme into simulated quantum annealing and develop

    更新日期:2020-09-02
  • Nonlinear Variable Selection via Deep Neural Networks
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-09-01
    Yao Chen; Qingyi Gao; Faming Liang; Xiao Wang

    This paper presents a general framework for high-dimensional nonlinear variable selection using deep neural networks under the framework of supervised learning. The network architecture includes both a selection layer and approximation layers. The problem can be cast as a sparsity-constrained optimization with a sparse parameter in the selection layer and other parameters in the approximation layers

    更新日期:2020-09-02
  • Reduced-dimensional Monte Carlo Maximum Likelihood for Latent Gaussian Random Field Models
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-08-24
    Jaewoo Park; Murali Haran

    Monte Carlo maximum likelihood (MCML) provides an elegant approach to find maximum likelihood estimators (MLEs) for latent variable models. However, MCML algorithms are computationally expensive when the latent variables are high-dimensional and correlated, as is the case for latent Gaussian random field models. Latent Gaussian random field models are widely used, for example in building flexible regression

    更新日期:2020-08-25
  • Nonstationary modeling with sparsity for spatial data via the basis graphical lasso
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-08-19
    Mitchell Krock; William Kleiber; Stephen Becker

    Many modern spatial models express the stochastic variation component as a basis expansion with random coefficients. Low rank models, approximate spectral decompositions, multiresolution representations, stochastic partial differential equations, and empirical orthogonal functions all fall within this basic framework. Given a particular basis, stochastic dependence relies on flexible modeling of the

    更新日期:2020-08-20
  • Dimension reduction for outlier detection using DOBIN
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-08-18
    Sevvandi Kandanaarachchi; Rob J. Hyndman

    This paper introduces DOBIN, a new approach to select a set of basis vectors tailored for outlier detection. DOBIN has a simple mathematical foundation and can be used as a dimension reduction tool for outlier detection tasks. We demonstrate the effectiveness of DOBIN on an extensive data repository, by comparing the performance of outlier detection methods using DOBIN and other bases. We further illustrate

    更新日期:2020-08-18
  • Functional regression for densely observed data with novel regularization
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-08-14
    Ruiyan Luo; Xin Qi

    Smoothness penalty is an efficient regularization method in functional data analysis. However, for a spiky coefficient function which may arise when densely observed spiky functional data are involved, the traditional smoothness penalty could be too strong and lead to an over-smoothed estimate. In this paper, we propose a new family of smoothness penalties which are expressed using wavelet coefficients

    更新日期:2020-08-15
  • Fast Search and Estimation of Bayesian Nonparametric Mixture Models Using a Classification Annealing EM Algorithm
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-08-14
    George Karabatsos

    Bayesian nonparametric (BNP) infinite-mixture models provide flexible and accurate density estimation, cluster analysis, and regression. However, for the posterior inference of such a model, MCMC algorithms are complex, often need to be tailor-made for different BNP priors, and are intractable for large data sets. We introduce a BNP classification annealing EM algorithm which employs importance sampling

    更新日期:2020-08-15
  • Trace Ratio Optimization for High-Dimensional Multi-Class Discrimination
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-08-14
    Jeongyoun Ahn; Hee Cheol Chung; Yongho Jeon

    In multi-class discrimination with high-dimensional data, identifying a lower-dimensional subspace with maximum class separation is crucial. We propose a new optimization criterion for finding such a discriminant subspace, which is the ratio of two traces: the trace of between-class scatter matrix and the trace of within-class scatter matrix. Since this problem is not well-defined for high-dimensional

    更新日期:2020-08-14
  • Spectrally Sparse Nonparametric Regression via Elastic Net Regularized Smoothers
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-08-14
    Nathaniel E. Helwig

    Nonparametric regression frameworks, such as generalized additive models (GAMs) and smoothing spline analysis of variance (SSANOVA) models, extend the generalized linear model (GLM) by allowing for unknown functional relationships between an exponential family response variable and a collection of predictor variables. The unknown functional relationships are typically estimated using penalized likelihood

    更新日期:2020-08-14
  • Model-Free Variable Selection with Matrix-Valued Predictors
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-08-14
    Zeda Li; Yuexiao Dong

    We introduce a novel framework for model-free variable selection with matrix-valued predictors. To test the importance of rows, columns, and submatrices of the predictor matrix in terms of predicting the response, three types of hypotheses are formulated under a unified framework. The asymptotic properties of the test statistics under the null hypothesis are established and a permutation testing algorithm

    更新日期:2020-08-14
  • Anomaly Detection in High Dimensional Data
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-08-13
    Priyanga Dilini Talagala; Rob J. Hyndman; Kate Smith-Miles

    The HDoutliers algorithm is a powerful unsupervised algorithm for detecting anomalies in high-dimensional data, with a strong theoretical foundation. However, it suffers from some limitations that significantly hinder its performance level, under certain circumstances. In this article, we propose an algorithm that addresses these limitations. We define an anomaly as an observation where its k-nearest

    更新日期:2020-08-14
  • Marginally-calibrated deep distributional regression
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-08-13
    Nadja Klein; David J. Nott; Michael Stanley Smith

    Deep neural network (DNN) regression models are widely used in applications requiring state-of-the-art predictive accuracy. However, until recently there has been little work on accurate uncertainty quantification for predictions from such models. We add to this literature by outlining an approach to constructing predictive distributions that are ‘marginally calibrated’. This is where the long run

    更新日期:2020-08-14
  • An efficient algorithm for minimizing multi non-smooth component functions
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-08-05
    Minh Pham; Anh Ninh; Hoang Le; Yufeng Liu

    Many problems in statistics and machine learning can be formulated as an optimization problem of a finite sum of non-smooth convex functions. We propose an algorithm to minimize this type of objective functions based on the idea of alternating linearization. Our algorithm retains the simplicity of contemporary methods without any restrictive assumptions on the smoothness of the loss function. We apply

    更新日期:2020-08-05
  • Model interpretation through lower-dimensional posterior summarization
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-07-21
    Spencer Woody; Carlos M. Carvalho; Jared S. Murray

    Nonparametric regression models have recently surged in their power and popularity, accompanying the trend of increasing dataset size and complexity. While these models have proven their predictive ability in empirical settings, they are often difficult to interpret and do not address the underlying inferential goals of the analyst or decision maker. In this paper, we propose a modular two-stage approach

    更新日期:2020-07-22
  • U-statistical inference for hierarchical clustering
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-07-20
    Marcio Valk; Gabriela Bettella Cybis

    Clustering methods are valuable tools for the identification of patterns in high dimensional data with applications in many scientific fields. However, quantifying uncertainty in clustering is a challenging problem, particularly when dealing with High Dimension Low Sample Size (HDLSS) data. We develop a U-statistics based clustering approach that assesses statistical significance in clustering and

    更新日期:2020-07-20
  • mcvis: A new framework for collinearity discovery, diagnostic and visualization
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-06-30
    Chen Lin; Kevin Wang; Samuel Mueller

    Collinearity discovery through diagnostic tools is an important analysis step when performing linear regression. Despite their wide-spread use, collinearity indices such as the variance inflation factor and the condition number have limitations and may not be effective in some applications. In this article we will contribute to the study of conventional collinearity indices through theoretical and

    更新日期:2020-06-30
  • Sparse Single Index Models for Multivariate Responses
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-06-30
    Yuan Feng; Luo Xiao; Eric C. Chi

    Joint models are popular for analyzing data with multivariate responses. We propose a sparse multivariate single index model, where responses and predictors are linked by unspecified smooth functions and multiple matrix level penalties are employed to select predictors and induce low-rank structures across responses. An alternating direction method of multipliers (ADMM) based algorithm is proposed

    更新日期:2020-06-30
  • Optimal Sampling for Generalized Linear Models under Measurement Constraints
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-06-08
    Tao Zhang; Yang Ning; David Ruppert

    Under “measurement constraints,” responses are expensive to measure and initially unavailable on most of records in the dataset, but the covariates are available for the entire dataset. Our goal is to sample a relatively small portion of the dataset where the expensive responses will be measured and the resultant sampling estimator is statistically efficient. Measurement constraints require the sampling

    更新日期:2020-06-08
  • Bayesian spatial clustering of extremal behaviour for hydrological variables
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-06-04
    Christian Rohrbeck; Jonathan A. Tawn

    To address the need for efficient inference for a range of hydrological extreme value problems, spatial pooling of information is the standard approach for marginal tail estimation. We propose the first extreme value spatial clustering methods which account for both the similarity of the marginal tails and the spatial dependence structure of the data to determine the appropriate level of pooling. Spatial

    更新日期:2020-06-04
  • Illumination depth
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-06-04
    Stanislav Nagy; Jiří Dvořák

    The concept of illumination bodies studied in convex geometry is used to amend the halfspace depth for multivariate data. The proposed notion of illumination enables finer resolution of the sample points, naturally breaks ties in the associated depth-based ordering, and introduces a depth-like function for points outside the convex hull of the support of the probability measure. The illumination is

    更新日期:2020-06-04
  • Surrogate Residuals for Discrete Choice Models
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-06-02
    Chao Cheng; Rui Wang; Heping Zhang

    Discrete Choice Models (DCMs) are a class of models for modelling response variables that take values from a set of alternatives. Examples include logistic regression, probit regression, and multinomial logistic regression. These models are also referred together as generalized linear models. Although there exist methods for the goodness of fit of DCMs, defining intuitive residuals for such models

    更新日期:2020-06-02
  • Delayed acceptance ABC-SMC
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-06-02
    Richard G. Everitt; Paulina A. Rowińska

    Approximate Bayesian computation (ABC) is now an established technique for statistical inference used in cases where the likelihood function is computationally expensive or not available. It relies on the use of a model that is specified in the form of a simulator, and approximates the likelihood at a parameter value θ by simulating auxiliary data sets x and evaluating the distance of x from the true

    更新日期:2020-06-02
  • Correction
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-05-28

    (2020). Correction. Journal of Computational and Graphical Statistics: Vol. 29, No. 3, pp. I-I.

    更新日期:2020-05-28
  • Efficient Parameter Sampling for Markov Jump Processes
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-05-07
    Boqian Zhang; Vinayak Rao

    Markov jump processes are continuous-time stochastic processes widely used in a variety of applied disciplines. Inference typically proceeds via Markov chain Monte Carlo, the state-of-the-art being a uniformization-based auxiliary variable Gibbs sampler. This was designed for situations where the process parameters are known, and Bayesian inference over unknown parameters is typically carried out by

    更新日期:2020-05-07
  • Automated Redistricting Simulation Using Markov Chain Monte Carlo
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-05-07
    Benjamin Fifield; , Michael Higgins; Kosuke Imai; Alexander Tarr

    Legislative redistricting is a critical element of representative democracy. A number of political scientists have used simulation methods to sample redistricting plans under various constraints to assess their impact on partisanship and other aspects of representation. However, while many optimization algorithms have been proposed, surprisingly few simulation methods exist in the published scholarship

    更新日期:2020-05-07
  • Predicting the Output From a Stochastic Computer Model When a Deterministic Approximation is Available
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-05-07
    Evan Baker; Peter Challenor; Matt Eames

    Statistically modeling the output of a stochastic computer model can be difficult to do accurately without a large simulation budget. We alleviate this problem by exploiting readily available deterministic approximations to efficiently learn about the respective stochastic computer models. This is done via the summation of two Gaussian processes; one responsible for modeling the deterministic approximation

    更新日期:2020-05-07
  • Identifying Heterogeneous Effect using Latent Supervised Clustering with Adaptive Fusion
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-05-06
    Jingxiang Chen; Quoc Tran-Dinh; Michael R. Kosorok; Yufeng Liu

    Precision medicine is an important area of research with the goal of identifying the optimal treatment for each individual patient. In the literature, various methods are proposed to divide the population into subgroups according to the heterogeneous effects of individuals. In this paper, a new exploratory machine learning tool, named latent supervised clustering, is proposed to identify the heterogeneous

    更新日期:2020-05-06
  • Massive parallelization boosts big Bayesian multidimensional scaling
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-05-05
    Andrew J. Holbrook; Philippe Lemey; Guy Baele; Simon Dellicour; Dirk Brockmann; Andrew Rambaut; Marc A. Suchard

    Big Bayes is the computationally intensive co-application of big data and large, expressive Bayesian models for the analysis of complex phenomena in scientific inference and statistical learning. Standing as an example, Bayesian multidimensional scaling (MDS) can help scientists learn viral trajectories through space-time, but its computational burden prevents its wider use. Crucial MDS model calculations

    更新日期:2020-05-05
  • Automatic Transformation and Integration to Improve Visualization and Discovery of Latent Effects in Imaging Data
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-04-27
    Gregory J. Hunt; Mark A. Dane; James E. Korkola; Laura M. Heiser; Johann A. Gagnon-Bartsch

    Proper data transformation is an essential part of analysis. Choosing appropriate transformations for variables can enhance visualization, improve efficacy of analytical methods, and increase data interpretability. However, determining appropriate transformations of variables from high-content imaging data poses new challenges. Imaging data produce hundreds of covariates from each of thousands of images

    更新日期:2020-04-27
  • Rerandomization strategies for balancing covariates using pre-experimental longitudinal data
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2020-04-21
    Per Johansson; Mårten Schultzberg

    ABSTRACT This paper considers experimental design based on the strategy of rerandomization to increase the efficiency in experiments. Two aspects of rerandomization are addressed. First, we propose a two-stage allocation sample scheme for randomization inference to the units in experiments that guarantees that the difference-in-mean estimator is an unbiased estimator of the sample average treatment

    更新日期:2020-04-21
  • A Pliable Lasso
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2019-09-05
    Robert Tibshirani; Jerome Friedman

    We propose a generalization of the lasso that allows the model coefficients to vary as a function of a general set of some prespecified modifying variables. These modifiers might be variables such as gender, age, or time. The paradigm is quite general, with each lasso coefficient modified by a sparse linear function of the modifying variables Z. The model is estimated in a hierarchical fashion to control

    更新日期:2020-04-20
  • Bivariate Residual Plots With Simulation Polygons
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2019-09-06
    Rafael A. Moral; John Hinde; Clarice G. B. Demétrio

    When using univariate models, goodness of fit can be assessed through many different methods, including graphical tools such as half-normal plots with a simulation envelope. This is straightforward due to the notion of ordering of a univariate sample, which can readily reveal possible outliers. In the bivariate case, however, it is often difficult to detect extreme points and verify whether a sample

    更新日期:2020-04-20
  • Estimating Time-Varying Graphical Models
    J. Comput. Graph. Stat. (IF 2.319) Pub Date : 2019-09-03
    Jilei Yang; Jie Peng

    In this article, we study time-varying graphical models based on data measured over a temporal grid. Such models are motivated by the needs to describe and understand evolving interacting relationships among a set of random variables in many real applications, for instance, the study of how stock prices interact with each other and how such interactions change over time. We propose a new model, LOcal

    更新日期:2020-04-20
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