Spatio-Temporal Methods in Environmental Epidemiology: 1st Edition (Hardback) book cover

Spatio-Temporal Methods in Environmental Epidemiology

1st Edition

By Gavin Shaddick, James V. Zidek

Chapman and Hall/CRC

395 pages | 52 Color Illus.

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pub: 2015-06-24
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Description

Teaches Students How to Perform Spatio-Temporal Analyses within Epidemiological Studies

Spatio-Temporal Methods in Environmental Epidemiology is the first book of its kind to specifically address the interface between environmental epidemiology and spatio-temporal modeling. In response to the growing need for collaboration between statisticians and environmental epidemiologists, the book links recent developments in spatio-temporal methodology with epidemiological applications. Drawing on real-life problems, it provides the necessary tools to exploit advances in methodology when assessing the health risks associated with environmental hazards. The book’s clear guidelines enable the implementation of the methodology and estimation of risks in practice.

Designed for graduate students in both epidemiology and statistics, the text covers a wide range of topics, from an introduction to epidemiological principles and the foundations of spatio-temporal modeling to new research directions. It describes traditional and Bayesian approaches and presents the theory of spatial, temporal, and spatio-temporal modeling in the context of its application to environmental epidemiology. The text includes practical examples together with embedded R code, details of specific R packages, and the use of other software, such as WinBUGS/OpenBUGS and integrated nested Laplace approximations (INLA). A supplementary website provides additional code, data, examples, exercises, lab projects, and more.

Representing a major new direction in environmental epidemiology, this book—in full color throughout—underscores the increasing need to consider dependencies in both space and time when modeling epidemiological data. Students will learn how to identify and model patterns in spatio-temporal data as well as exploit dependencies over space and time to reduce bias and inefficiency.

Reviews

"The authors of this text, both accomplished researchers in the area, provide a much-needed consolidation of spatio-temporal modelling methods…The textbook condenses many complex topics into accessible and manageable chapters addressing key elements of modern spatio-temporal analyses of environmental epidemiologic data…The authors provide helpful R examples throughout…Analytic challenges such as missing data, measurement error, and preferential sampling often arise in environmental epidemiology and are each described in detail along with focused data examples and accompanying code…The text covers a remarkable number of topics in its 318 pages (including many full color graphics and examples of code and output). The structure outlined above provides excellent coverage of many areas of recent development, held together with compelling examples and illustrations…Overall, I found the book a comprehensive overview placing many different topics into a logical perspective with focused, helpful examples. I enjoyed reading the book, am already recommending it to colleagues, and anticipate referring to it often in my future work."

—Lance A.Waller, Emory University, The American Statistician, November 2016

Table of Contents

Why spatio-temporal epidemiology?

Overview

Health-exposure models

Dependencies over space and time

Examples of spatio-temporal epidemiological analyses

Bayesian hierarchical models

Spatial data

Good spatio-temporal modelling approaches

Modelling health risks

Overview

Types of epidemiological study

Measures of risk

Standardised mortality ratios (SMRs)

Generalised linear models

Generalised additive models

Generalised estimating equations

Poisson models for count data

Estimating relative risks in relation to exposures

Modelling the cumulative effects of exposure

Logistic models for case-controls studies

The importance of uncertainty

Overview

The wider world of uncertainty

Quantitative uncertainty

Methods for assessing uncertainty

Quantifying uncertainty

Embracing uncertainty: the Bayesian approach

Overview

Introduction to Bayesian inference

Exchangeability

Using the posterior for inference

Predictions

Transformations of parameters

Prior formulation

The Bayesian approach in practice

Overview

Analytical approximations

Markov chain Monte Carlo (MCMC)

Using samples for inference

WinBUGS

INLA

Strategies for modelling

Overview

Contrasts

Hierarchical models

Generalised linear mixed models

Linking exposure and health models

Model selection and comparison

What about the p-value?

Comparison of models—Bayes factors

Bayesian model averaging

Is ‘real’ data always quite so real?

Overview

Missing Values

Measurement error

Preferential sampling

Spatial patterns in disease

Overview

The Markov random field (MRF)

The conditional autoregressive (CAR) model

Spatial models for disease mapping

From points to fields: modelling environmental hazards over space

Overview

A brief history of spatial modelling

Exploring spatial data

Modelling spatial data

Spatial trend

Spatial prediction

Stationary and isotropic spatial processes

Variograms

Fitting variogram models

Kriging

Extensions of simple kriging

A hierarchical model for spatially varying exposures

INLA and spatial modelling in a continuous domain

Non-stationary random fields

Why time also matters

Overview

Time series epidemiology

Time series modelling

Modelling the irregular components

The spectral representation theorem and Bochner’s lemma

Forecasting

State space models

A hierarchical model for temporally varying exposures

The interplay between space and time in exposure assessment

Overview

Strategies

Spatio-temporal models

Dynamic linear models for space and time

An empirical Bayes approach

A hierarchical model for spatio-temporal exposure data

Approaches to modelling non-separable processes

Roadblocks on the way to causality: exposure pathways, aggregation and other sources of bias

Overview

Causality

Ecological bias

Acknowledging ecological bias

Exposure pathways

Personal exposure models

Better exposure measurements through better design

Overview

Design objectives?

Design paradigms

Geometry-based designs

Probability-based designs

Model-based

An entropy-based approach

Implementation challenges

New frontiers

Overview

Non-stationary fields

Physical–statistical modelling

The problem of extreme values

Appendix 1: Distribution theory

Appendix 2: Entropy decomposition

References

Index

Author index

A Summary and Exercises appear at the end of each chapter.

About the Authors

Gavin Shaddick is a reader in statistics in the Department of Mathematical Sciences at the University of Bath. He received his master’s in applied stochastic systems from University College London and his PhD in statistics and epidemiology from Imperial College London.

His research interests include the theory and application of Bayesian statistics to the areas of spatial epidemiology, environmental health risk, and the modeling of spatio-temporal fields of environmental hazards. Of particular interest are computational techniques that allow the implementation of complex statistical models to real-life applications where the scope over both space and time may be very large.

Dr. Shaddick is actively involved in a number of substantive epidemiological projects related to the effects of air pollution to health. He has worked on many large-scale funded projects, including the high-resolution mapping of environmental pollutants, the utilization of information from multiple sources in estimating exposures to environmental hazards, and the characterization of uncertainty in scenario assessment and policy support.

He is a co-author of the Oxford Handbook of Epidemiology for Clinicians, which was Highly Commended in the Basis of Medicine Category, BMA Book Awards 2013.

James V. Zidek is a professor emeritus in the Department of Statistics at the University of British Columbia. Professor Zidek received his MSc and PhD in statistics from the University of Alberta and Stanford University, respectively.

He began his research career working on Wald’s statistical decision theory. That interest shifted into Bayesian decision analysis. His interest in applications also emerged early in his career and as a consultant, published with engineering collaborators, the first design code for long-span bridges, such as the famous Golden Gate Bridge in San Francisco. The combination of theory and practice led him to an EPA project on acid rain where he, with a few of his collaborators, started to lay the foundations of environmetrics as it is now called, notably on the design of environmental monitoring networks and spatio-temporal modeling of environmental processes. That work led naturally into spatio-temporal epidemiology, which remains an area of interest. He has published about 100 refereed articles and a book on modeling environmental processes.

His contributions to statistics have been recognized by a number of honors. He is a fellow of the ASA, IMS, and Royal Society of Canada; member of the ISI; and a recipient of the Gold Medal of the Statistical Society of Canada (its highest honor).

About the Series

Chapman & Hall/CRC Texts in Statistical Science

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Subject Categories

BISAC Subject Codes/Headings:
MAT029000
MATHEMATICS / Probability & Statistics / General
MED028000
MEDICAL / Epidemiology