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Fast grid search and bootstrap‐based inference for continuous two‐phase polynomial regression models Environmetrics (IF 1.039) Pub Date : 2020-11-27 Hyunju Son; Youyi Fong
Two‐phase polynomial regression models (Robison, 1964; Fuller, 1969; Gallant and Fuller, 1973; Zhan et al., 1996) are widely used in ecology, public health, and other applied fields to model nonlinear relationships. These models are characterized by the presence of threshold parameters, across which the mean functions are allowed to change. That the threshold is a parameter of the model to be estimated
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On the spatial and temporal shift in the archetypal seasonal temperature cycle as driven by annual and semi‐annual harmonics Environmetrics (IF 1.039) Pub Date : 2020-12-28 Joshua S. North; Erin M. Schliep; Christopher K. Wikle
Statistical methods are required to evaluate and quantify the uncertainty in environmental processes, such as land and sea surface temperature, in a changing climate. Typically, annual harmonics are used to characterize the variation in the seasonal temperature cycle. However, an often overlooked feature of the climate seasonal cycle is the semi‐annual harmonic, which can account for a significant
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Spatial hierarchical modeling of threshold exceedances using rate mixtures Environmetrics (IF 1.039) Pub Date : 2020-10-26 Rishikesh Yadav; Raphaël Huser; Thomas Opitz
We develop new flexible univariate models for light‐tailed and heavy‐tailed data, which extend a hierarchical representation of the generalized Pareto (GP) limit for threshold exceedances. These models can accommodate departure from asymptotic threshold stability in finite samples while keeping the asymptotic GP distribution as a special (or boundary) case and can capture the tails and the bulk jointly
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Likelihood‐based inference for spatiotemporal data with censored and missing responses Environmetrics (IF 1.039) Pub Date : 2020-11-05 Katherine A. L. Valeriano; Victor H. Lachos; Marcos O. Prates; Larissa A. Matos
This paper proposes an alternative method to deal with spatiotemporal data with censored and missing responses using the SAEM algorithm. This algorithm is a stochastic approximation of the widely used EM algorithm and is an important tool for models in which the E‐step does not have an analytic form. Besides the algorithm developed to estimate the model parameters from a likelihood‐based perspective
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Modeling short‐ranged dependence in block extrema with application to polar temperature data Environmetrics (IF 1.039) Pub Date : 2020-10-05 Brook T. Russell; Whitney K. Huang
The block maxima approach is an important method in univariate extreme value analysis. While assuming that block maxima are independent results in straightforward analysis, the resulting inferences maybe invalid when a series of block maxima exhibits dependence. We propose a model, based on a first‐order Markov assumption, that incorporates dependence between successive block maxima through the use
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Data fusion with Gaussian processes for estimation of environmental hazard events Environmetrics (IF 1.039) Pub Date : 2020-09-24 Xiaoyu Xiong; Benjamin D. Youngman; Theodoros Economou
Environmental hazard events such as extra‐tropical cyclones or windstorms that develop in the North Atlantic can cause severe societal damage. Environmental hazard is quantified by the hazard footprint, a spatial area describing potential damage. However, environmental hazards are never directly observed, so estimation of the footprint for any given event is primarily reliant on station observations
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Discussion on A high‐resolution bilevel skew‐t stochastic generator for assessing Saudi Arabia's wind energy resources Environmetrics (IF 1.039) Pub Date : 2020-08-15 Emilio Porcu; Jonas Rysgaard; Valerie Eveloy
We provide a detailed discussion on the analysis presented by Tagle and co‐authors, who suggested an approach to improve earlier models for handling non‐Gaussianity in spatial wind field speed data by simplifying the model formulation to better accommodate large data sets. Our discussion focuses on the energy and socio‐economic context of wind potential assessment in Saudi Arabia – an oil‐rich country
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Rejoinder to the discussion on A high‐resolution bilevel skew‐t stochastic generator for assessing Saudi Arabia's wind energy resources Environmetrics (IF 1.039) Pub Date : 2020-09-20 Felipe Tagle; Marc G. Genton; Andrew Yip; Suleiman Mostamandi; Georgiy Stenchikov; Stefano Castruccio
This is the rejoinder of the discussion article: env‐19‐0145, DOI: 10.1002/env.2628
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A parametric model for distributions with flexible behavior in both tails Environmetrics (IF 1.039) Pub Date : 2020-08-31 Michael L. Stein
For many problems of inference about a marginal distribution function, while the entire distribution is important, extreme quantiles are of particular interest because rare outcomes may have large consequences. In some applications, only the extreme upper quantiles require extra attention, but in, for example, climatological applications, extremes in both tails of the distribution can be impactful
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A spatiotemporal model for multivariate occupancy data Environmetrics (IF 1.039) Pub Date : 2020-08-19 Staci A. Hepler; Robert J. Erhardt
We present a multivariate occupancy model to simultaneously model the presence/absence of multiple species, and demonstrate its use with a goal of estimating parameters related to occupancy. The proposed model accounts for both spatial and temporal dependence within each species, as well as dependence across all species. These dependencies are addressed through random effects, defined so there is no
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Simultaneous autoregressive models for spatial extremes Environmetrics (IF 1.039) Pub Date : 2020-08-17 Miranda J. Fix; Daniel S. Cooley; Emeric Thibaud
Motivated by the widespread use of large gridded data sets in the atmospheric sciences, we propose a new model for extremes of areal data that is inspired by the simultaneous autoregressive (SAR) model in classical spatial statistics. Our extreme SAR model extends recent work on transformed‐linear operations applied to regularly varying random vectors, and is unique among extremes models in being directly
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Modeling spatial data using local likelihood estimation and a Matérn to spatial autoregressive translation Environmetrics (IF 1.039) Pub Date : 2020-09-16 Ashton Wiens, Douglas Nychka, William Kleiber
Modeling data with nonstationary covariance structure is important to represent heterogeneity in geophysical and other environmental spatial processes. In this work, we investigate a two‐stage approach to modeling nonstationary covariances that is efficient for large data sets. First, maximum likelihood estimation is used in local, moving windows to infer spatially varying covariance parameters. These
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A smoothing spline model for multimodal and skewed circular responses: Applications in meteorology and oceanography Environmetrics (IF 1.039) Pub Date : 2020-08-17 Fatemeh Hassanzadeh
The analysis of circular data is the main subject in many disciplines, such as meteorology and oceanography. In this article, we introduce a new multimodal skew‐circular model as an extension of the circular beta distribution. We propose a truncated power smoothing spline for modeling the skewness parameter and identifying significant factors of the asymmetry. A Markov chain Monte Carlo scheme is provided
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Adjusting a finite population block kriging estimator for imperfect detection Environmetrics (IF 1.039) Pub Date : 2020-08-15 Matt Higham; Jay Ver Hoef; Lisa Madsen; Andy Aderman
A finite population version of block kriging (FPBK) estimates a total or a mean when there is perfect detection of population units. However, many environmental datasets challenge the assumption of perfect detection. We consider two extensions of FPBK that incorporate imperfect detection. Spatial population estimator with detection: ratio then add (SPEDRA) adjusts observed counts by the estimated detection
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A spatial capture–recapture model with attractions between individuals Environmetrics (IF 1.039) Pub Date : 2020-08-11 Paul McLaughlin; Haim Bar
Over the past two decades there have been many advancements in modeling capture–recapture (CR) data to account for emerging data collection technology and techniques. Spatial capture–recapture (SCR) models have been introduced to estimate population size and numerous other demographic parameters from spatially explicit CR data. Recently SCR models have also begun incorporating realistic animal movement
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A spatio‐temporal model for the analysis and prediction of fine particulate matter concentration in Beijing Environmetrics (IF 1.039) Pub Date : 2020-07-19 Yating Wan; Minya Xu; Hui Huang; Song Xi Chen
Effective air quality management and forecasting in Beijing is urgently needed as the region suffers from the worst air pollution in any standards. However, the statistical mechanism of the PM2.5 formation with respect to various factors is underexplored in this region and China in general. Through an elaborate application with refinement of a spatio‐temporal model with varying coefficients to the
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Discussion on A high‐resolution bilevel skew‐t stochastic generator for assessing Saudi Arabia's wind energy resources Environmetrics (IF 1.039) Pub Date : 2020-07-18 Andrew Zammit‐Mangion
Statistical spatiotemporal environmental data analysis is rarely straightforward, with one having to face challenges relating to big data, non‐Gaussianity, nonstationarity, multiple scales of behavior, deterministic (numerical) model output, and more. One often has to rely heavily on good statistical parallel computing skills and sound knowledge of the application domain. The work of Tagle et al. (2020)
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Sequential tests of causality between environmental time series: With application to the global warming theory Environmetrics (IF 1.039) Pub Date : 2020-07-06 Carlo Grillenzoni; Elisa Carraro
Analysis of the causality between environmental time series is particularly debated nowadays. Checking if the global warming is caused by human activities or the solar irradiance, or if air pollution is produced by industrial plants or consumers' behavior are typical examples. Statistical methods for testing these hypotheses mainly focus on bivariate autoregressive (ARX) models and their fitting performance;
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Functional estimation of diversity profiles Environmetrics (IF 1.039) Pub Date : 2020-06-29 Francesca Fortuna; Stefano Antonio Gattone; Tonio Di Battista
It is well known that the diversity profile provides a complete picture about the evenness of the relative abundance distribution of an ecological population. This complexity measure is a continuous function evaluated on a suitable grid of values x ≥ 0 that determine the measure's sensitivity to the most dominant species. In this paper, a functional design‐based estimation of diversity profiles is
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Quantifying the impact of the modifiable areal unit problem when estimating the health effects of air pollution Environmetrics (IF 1.039) Pub Date : 2020-06-23 Duncan Lee; Chris Robertson; Colin Ramsay; Kate Pyper
Air pollution is a major public health concern, and large numbers of epidemiological studies have been conducted to quantify its impacts. One study design used to quantify these impacts is a spatial areal unit design, which estimates a population‐level association using data on air pollution concentrations and disease incidence that have been spatially aggregated to a set of nonoverlapping areal units
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A joint Bayesian space–time model to integrate spatially misaligned air pollution data in R‐INLA Environmetrics (IF 1.039) Pub Date : 2020-06-23 C. Forlani; S. Bhatt; M. Cameletti; E. Krainski; M. Blangiardo
In air pollution studies, dispersion models provide estimates of concentration at grid level covering the entire spatial domain and are then calibrated against measurements from monitoring stations. However, these different data sources are misaligned in space and time. If misalignment is not considered, it can bias the predictions. We aim at demonstrating how the combination of multiple data sources
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Bayesian nonparametric monotone regression Environmetrics (IF 1.039) Pub Date : 2020-06-08 Ander Wilson; Jessica Tryner; Christian L'Orange; John Volckens
In many applications there is interest in estimating the relation between a predictor and an outcome when the relation is known to be monotone or otherwise constrained due to the physical processes involved. We consider one such application‐inferring time‐resolved aerosol concentration from a low‐cost differential pressure sensor. The objective is to estimate a monotone function and make inference
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Robust functional multivariate analysis of variance with environmental applications Environmetrics (IF 1.039) Pub Date : 2020-05-31 Zhuo Qu; Wenlin Dai; Marc G. Genton
We propose median polish for functional multivariate analysis of variance (FMANOVA) with the implementation of depth for multivariate functional data. As an alternative to classical mean estimation, functional median polish estimates the functional grand effect and factor effects based on functional medians in one‐way and two‐way additive FMANOVA models. Median polish estimates in FMANOVA are visually
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On modeling positive continuous data with spatiotemporal dependence Environmetrics (IF 1.039) Pub Date : 2020-05-30 Moreno Bevilacqua; Christian Caamaño‐Carrillo; Carlo Gaetan
In this article, we concentrate on an alternative modeling strategy for positive data that exhibit spatial or spatiotemporal dependence. Specifically, we propose to consider stochastic processes obtained through a monotone transformation of scaled version of χ2 random processes. The latter is well known in the specialized literature and originates by summing independent copies of a squared Gaussian
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An extended and unified modeling framework for benchmark dose estimation for both continuous and binary data Environmetrics (IF 1.039) Pub Date : 2020-05-16 Marc Aerts; Matthew W. Wheeler; José Cortiñas Abrahantes
Protection and safety authorities recommend the use of model averaging to determine the benchmark dose approach as a scientifically more advanced method compared with the no‐observed‐adverse‐effect‐level approach for obtaining a reference point and deriving health‐based guidance values. Model averaging however highly depends on the set of candidate dose–response models and such a set should be rich
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Detecting British Columbia coastal rainfall patterns by clustering Gaussian processes Environmetrics (IF 1.039) Pub Date : 2020-05-16 F. Paton; P.D. McNicholas
Functional data analysis is a statistical framework where data are assumed to follow some functional form. This method of analysis is commonly applied to time series data, where time, measured continuously or in discrete intervals, serves as the location for a function's value. Gaussian processes are a generalization of the multivariate normal distribution to function space and, in this article, they
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Space‐time autoregressive estimation and prediction with missing data based on Kalman filtering Environmetrics (IF 1.039) Pub Date : 2020-05-11 Leonardo Padilla; Bernado Lagos‐Álvarez; Jorge Mateu; Emilio Porcu
We propose a Kalman filter algorithm to provide a formal statistical analysis of space‐time data with an autoregressive structure in time. The Kalman filter technique allows to capture the temporal dependence as well as the spatial correlation structure through state‐space equations, and it is aimed to perform statistical inference in terms of parameter estimation and prediction at unobserved locations
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Ensemble forecasting of the Zika space‐time spread with topological data analysis Environmetrics (IF 1.039) Pub Date : 2020-05-05 Marwah Soliman; Vyacheslav Lyubchich; Yulia R. Gel
As per the records of the World Health Organization, the first formally reported incidence of Zika virus occurred in Brazil in May 2015. The disease then rapidly spread to other countries in Americas and East Asia, affecting more than 1,000,000 people. Zika virus is primarily transmitted through bites of infected mosquitoes of the species Aedes (Aedes aegypti and Aedes albopictus). The abundance of
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A high‐resolution bilevel skew‐t stochastic generator for assessing Saudi Arabia's wind energy resources Environmetrics (IF 1.039) Pub Date : 2020-05-03 Felipe Tagle; Marc G. Genton; Andrew Yip; Suleiman Mostamandi; Georgiy Stenchikov; Stefano Castruccio
Saudi Arabia has recently established its renewable energy targets as part of its “Vision 2030” proposal, which represents a roadmap for reducing the country's dependence on oil over the next decade. This study provides a foundational assessment of the wind resource in Saudi Arabia that serves as a guide for the development of the outlined wind energy component. The assessment is based on a new high‐resolution
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Incorporating covariate information in the covariance structure of misaligned spatial data Environmetrics (IF 1.039) Pub Date : 2020-04-27 Esmail Yarali, Firoozeh Rivaz
Incorporating covariates in the second‐ structure of spatial processes is an effective way of building flexible nonstationary covariance models. Fitting these covariances requires covariates to already exist at locations where there is response data. However, studies in environmental statistics often involve covariate and response data that are misaligned in space. A common strategy to remedy this
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Heatwave duration: Characterizations using probabilistic inference Environmetrics (IF 1.039) Pub Date : 2020-03-20 Sohini Raha, Sujit K. Ghosh
Characterization of heatwave duration is becoming increasingly important in environmental research as they pose a significant threat to many human lives worldwide. Although several quantification of the extremities of a heatwave have been proposed in literature, they are mostly improvised and there does not exist a universally accepted definition of heatwave. In this article, we devise a probabilistic
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A sample coordination method to monitor totals of environmental variables Environmetrics (IF 1.039) Pub Date : 2020-03-10 Xin Zhao, Anton Grafström
A new sampling strategy for design‐based environmental monitoring is proposed. It has the potential to produce superior estimators for totals of environmental variables and their changes over time. In the strategy, we combine two concepts known as spatially balanced sampling and coordination of samples. Spatially balanced sampling can provide superior estimators of totals, while coordination of samples
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Flexible covariate representations for extremes Environmetrics (IF 1.039) Pub Date : 2020-03-04 E. Zanini, E. Eastoe, M. J. Jones, D. Randell, P. Jonathan
Environmental extremes often show systematic variation with covariates. Three different nonparametric descriptions (penalized B‐splines, Bayesian adaptive regression splines, and Voronoi partition) for the dependence of extreme value model parameters on covariates are considered. These descriptions take the generic form of a linear combination of basis functions on the covariate domain, but differ
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Issue Information Environmetrics (IF 1.039) Pub Date : 2020-03-01
No abstract is available for this article.
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Bayesian spatial extreme value analysis of maximum temperatures in County Dublin, Ireland Environmetrics (IF 1.039) Pub Date : 2020-02-04 John O'Sullivan, Conor Sweeney, Andrew C. Parnell
In this study, we begin a comprehensive characterization of temperature extremes in Ireland for the period 1981–2010. We produce return levels of anomalies of daily maximum temperature extremes for an area over Ireland, for the 30‐year period 1981–2010. We employ extreme value theory (EVT) to model the data using the generalized Pareto distribution (GPD) as part of a three‐level Bayesian hierarchical
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Modeling the duration and size of extended attack wildfires as dependent outcomes Environmetrics (IF 1.039) Pub Date : 2020-01-21 Dexen DZ. Xi, C.B. Dean, Stephen W. Taylor
Understanding the complex relationship between the duration and size of forest fires is important in order to better predict these key characteristics of fires for fire management purposes in a changing climate. Describing this relationship is also important for our fundamental understanding of fire science. Here, we develop and utilize novel techniques for characterizing the distribution of multiple
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A lattice and random intermediate point sampling design for animal movement Environmetrics (IF 1.039) Pub Date : 2020-01-03 Elizabeth Eisenhauer, Ephraim Hanks
Animal movement studies have become ubiquitous in animal ecology for the estimation of space use and the analysis of movement behavior. In these studies, animal movement data are primarily collected at regular time intervals. We propose an irregular sampling design that could lead to greater efficiency and information gain in animal movement studies. Our novel sampling design, called lattice and random
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Bayesian estimation and model selection of a multivariate smooth transition autoregressive model Environmetrics (IF 1.039) Pub Date : 2019-12-26 Glen Livingston Jr, Darfiana Nur
The multivariate smooth transition autoregressive model with order k (M‐STAR)(k) is a nonlinear multivariate time series model able to capture regime changes in the conditional mean. The main aim of this paper is to develop a Bayesian estimation scheme for the M‐STAR(k) model that includes the coefficient parameter matrix, transition function parameters, covariance parameter matrix, and the model order
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Hidden Markov random field models applied to color homogeneity evaluation in dyed textile images Environmetrics (IF 1.039) Pub Date : 2019-12-25 Victor Freguglia, Nancy L. Garcia, Juliano L. Bicas
Color is one of the most important features in any textile material. Due to its competitive price, most of the colorants currently used for textile dyeing are synthetic, originated from nonrenewable sources, and highly pollutant. There is an increasing interest for natural processes to dye fabrics. When new textile dyeing technologies are developed, evaluating the quality of these techniques involves
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Spatiotemporal reconstructions of global CO2‐fluxes using Gaussian Markov random fields Environmetrics (IF 1.039) Pub Date : 2019-12-21 Unn Dahlén, Johan Lindström, Marko Scholze
Atmospheric inverse modeling is a method for reconstructing historical fluxes of green‐house gas between land and atmosphere, using observed atmospheric concentrations and an atmospheric tracer transport model. The small number of observed atmospheric concentrations in relation to the number of unknown flux components makes the inverse problem ill‐conditioned, and assumptions on the fluxes are needed
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Structural break analysis for spectrum and trace of covariance operators Environmetrics (IF 1.039) Pub Date : 2019-12-20 A. Aue, G. Rice, O. Sönmez
This paper deals with analyzing structural breaks in the covariance operator of sequentially observed functional data. For this purpose, procedures are developed to segment an observed stretch of curves into periods for which second‐order stationarity may be reasonably assumed. The proposed methods are based on measuring the fluctuations of sample eigenvalues, either individually or jointly, and traces
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A permutation approach to the analysis of spatiotemporal geochemical data in the presence of heteroscedasticity Environmetrics (IF 1.039) Pub Date : 2019-12-20 Veronika Římalová, Alessandra Menafoglio, Alessia Pini, Vilém Pechanec, Eva Fišerová
This paper proposes a novel nonparametric approach to model and reveal differences in the geochemical properties of the soil, when these are described by space–time measurements collected in a spatial region naturally divided into two parts. The investigation is motivated by a real study on a space–time geochemical data set, consisting of measurements of potassium chloride pH, water pH, and percentage
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Harnessing the power of topological data analysis to detect change points Environmetrics (IF 1.039) Pub Date : 2019-12-19 Umar Islambekov, Monisha Yuvaraj, Yulia R. Gel
We introduce a novel geometry‐oriented methodology, based on the emerging tools of topological data analysis, into the change‐point detection framework. The key rationale is that change points are likely to be associated with changes in geometry behind the data‐generating process. While the applications of topological data analysis to change‐point detection are potentially very broad, in this paper
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Probabilistic predictive principal component analysis for spatially misaligned and high-dimensional air pollution data with missing observations. Environmetrics (IF 1.039) Pub Date : 2019-12-19 Phuong T Vu,Timothy V Larson,Adam A Szpiro
Accurate predictions of pollutant concentrations at new locations are often of interest in air pollution studies on fine particulate matters (PM2.5), in which data are usually not measured at all study locations. PM2.5 is also a mixture of many different chemical components. Principal component analysis (PCA) can be incorporated to obtain lowerdimensional representative scores of such multipollutant
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Modeling sea‐level processes on the U.S. Atlantic Coast Environmetrics (IF 1.039) Pub Date : 2019-12-05 Candace Berrett, William F. Christensen, Stephan R. Sain, Nathan Sandholtz, David W. Coats, Claudia Tebaldi, Hedibert F. Lopes
One of the major concerns engendered by a warming climate are changing sea levels and their lasting effects on coastal populations, infrastructures, and natural habitats. Sea levels are now monitored by satellites, but long‐term records are only available at discrete locations along the coasts. Sea levels and sea‐level processes must be better understood at the local level to best inform real‐world
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Predicting extreme surges from sparse data using a copula‐based hierarchical Bayesian spatial model Environmetrics (IF 1.039) Pub Date : 2019-12-05 N. Beck, C. Genest, J. Jalbert, M. Mailhot
A hierarchical Bayesian model is proposed to quantify the magnitude of extreme surges on the Atlantic coast of Canada with limited data. Generalized extreme value distributions are fitted to surges derived from water levels measured at 21 buoys along the coast. The parameters of these distributions are linked together through a Gaussian field whose mean and variance are driven by atmospheric sea‐level
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Bayesian spatial analysis of hardwood tree counts in forests via MCMC Environmetrics (IF 1.039) Pub Date : 2019-12-03 Reihaneh Entezari, Patrick E. Brown, Jeffrey S. Rosenthal
In this paper, we use a Bayesian spatial model to spatially interpolate forest inventory data from the Timiskaming and Abitibi River forests in Ontario, Canada. We consider a Bayesian generalized linear geostatistical model and implement a Markov chain Monte Carlo algorithm to sample from its posterior distribution. How spatial predictions for new sites in the forests change as the amount of training
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Issue Information Environmetrics (IF 1.039) Pub Date : 2019-12-02
No abstract is available for this article.
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Bayesian inference for finite populations under spatial process settings Environmetrics (IF 1.039) Pub Date : 2019-11-22 Alec M. Chan‐Golston, Sudipto Banerjee, Mark S. Handcock
We develop a Bayesian model–based approach to finite population estimation accounting for spatial dependence. Our innovation here is a framework that achieves inference for finite population quantities in spatial process settings. A key distinction from the small area estimation setting is that we analyze finite populations referenced by their geographic coordinates. Specifically, we consider a two‐stage
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Space–time trends and dependence of precipitation extremes in North‐Western Germany Environmetrics (IF 1.039) Pub Date : 2019-11-20 R. Cabral, A. Ferreira, P. Friederichs
The assessment of long‐term trends in environmental extremes is a challenging and important subject in the current discussion on global climate change. We propose a new approach for evaluating temporal trends and spatial homogeneity in extremes accounting also for spatial dependence. Based on exceedances over a space–time threshold, we provide estimators for a so‐called scedasis function and the extreme
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Goodness‐of‐fit tests for βARMA hydrological time series modeling Environmetrics (IF 1.039) Pub Date : 2019-11-14 Vinícius T. Scher, Francisco Cribari‐Neto, Guilherme Pumi, Fábio M. Bayer
We address the issue of performing portmanteau testing inference using time series data that assume values in the standard unit interval. The motivation involves modeling the time series dynamics of the proportion of stocked hydroelectric energy in the South of Brazil. Our focus lies in the class of beta autoregressive moving average (βARMA) models. In particular, we wish to test the goodness‐of‐fit
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Estimating population size with imperfect detection using a parametric bootstrap Environmetrics (IF 1.039) Pub Date : 2019-11-03 Lisa Madsen, Dan Dalthorp, Manuela Maria Patrizia Huso, Andy Aderman
We develop a novel method of estimating population size from imperfectly detected counts of individuals and a separate estimate of detection probability. Observed counts are separated into classes within which detection probability is assumed constant. Within a detection class, counts are modeled as a single binomial observation X with success probability p where the goal is to estimate index N. We
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Nonlinear reaction–diffusion process models improve inference for population dynamics Environmetrics (IF 1.039) Pub Date : 2019-11-03 Xinyi Lu, Perry J. Williams, Mevin B. Hooten, James A. Powell, Jamie N. Womble, Michael R. Bower
Partial differential equations (PDEs) are a useful tool for modeling spatiotemporal dynamics of ecological processes. However, as an ecological process evolves, we need statistical models that can adapt to changing dynamics as new data are collected. We developed a model that combines an ecological diffusion equation and logistic growth to characterize colonization processes of a population that establishes
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A multivariate spatial skew‐t process for joint modeling of extreme precipitation indexes Environmetrics (IF 1.039) Pub Date : 2019-10-29 Arnab Hazra, Brian J. Reich, Ana‐Maria Staicu
To study trends in extreme precipitation across the United States over the years 1951–2017, we analyze 10 climate indexes that represent extreme precipitation, such as annual maximum of daily precipitation and annual maximum of consecutive five‐day average precipitation. We consider the gridded data produced by the CLIMDEX project (http://www.climdex.org/gewocs.html), constructed using daily precipitation
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Issue Information Environmetrics (IF 1.039) Pub Date : 2019-10-13
No abstract is available for this article.
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Issue Information Environmetrics (IF 1.039) Pub Date : 2019-09-04
No abstract is available for this article.
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Spatio‐temporal classification in point patterns under the presence of clutter Environmetrics (IF 1.039) Pub Date : 2019-08-23 Marianna Siino, Francisco J. Rodríguez‐Cortés, Jorge Mateu, Giada Adelfio
We consider the problem of detection of features in the presence of clutter for spatio‐temporal point patterns. In previous studies, related to the spatial context, Kth nearest‐neighbor distances to classify points between clutter and features. In particular, a mixture of distributions whose parameters were estimated using an expectation‐maximization algorithm. This paper extends this methodology to
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Comments on Schoenberg et al. (2003) Environmetrics (IF 1.039) Pub Date : 2019-08-16 Hamid Ghorbani
This article comments on the work of Schoenberg FP et al., “On the distribution of wildfire sizes. Environmetrics. 2003;14:e605. https://doi.org/10.1002/env.605.” These comments are mainly about both numerical and visual goodness‐of‐fit criteria, used for comparing the performance of candidate distributions for wildfire sizes. First, the maximum likelihood estimate of the half‐normal distribution and
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A Bayesian spatiotemporal model of panel design data: Airborne particle number concentration in Brisbane, Australia Environmetrics (IF 1.039) Pub Date : 2019-08-04 Sam Clifford, Samantha Low‐Choy, Mandana Mazaheri, Farhad Salimi, Lidia Morawska, Kerrie Mengersen
In environmental monitoring, the ability to obtain high‐quality data across space and time is often limited by the cost of purchasing, deploying and maintaining a large collection of equipment, and the employment of personnel to perform these tasks. An ideal design for a monitoring campaign would be dense enough in time to capture short‐range variation at each site, long enough in time to examine trends
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Bayesian time‐varying quantile regression to extremes Environmetrics (IF 1.039) Pub Date : 2019-07-28 Fernando Ferraz Do Nascimento, Marcelo Bourguignon
Maximum analysis consists of modeling the maximums of a data set by considering a specific distribution. Extreme value theory (EVT) shows that, for a sufficiently large block size, the maxima distribution is approximated by the generalized extreme value (GEV) distribution. Under EVT, it is important to observe the high quantiles of the distribution. In this sense, quantile regression techniques fit
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