Comparing Groups : Randomization and Bootstrap Methods Using R

A hands-on guide to using R to carry out key statistical practices in educational and behavioral sciences research Computing has become an essential part of the day-to-day practice of statistical work, broadening the types of questions that can now be addressed by research scientists applying newly derived data analytic techniques. Comparing Groups: Randomization and Bootstrap Methods Using R emphasizes the direct link between scientific research questions and data analysis. Rather than relying on mathematical calculations, this book focus on conceptual explanations and the use of statistical computing in an effort to guide readers through the integration of design, statistical methodology, and computation to answer specific research questions regarding group differences. Utilizing the widely-used, freely accessible R software, the authors introduce a modern approach to promote methods that provide a more complete understanding of statistical concepts. Following an introduction to R, each chapter is driven by a research question, and empirical data analysis is used to provide answers to that question. These examples are data-driven inquiries that promote interaction between statistical methods and ideas and computer application. Computer code and output are interwoven in the book to illustrate exactly how each analysis is carried out and how output is interpreted. Additional topical coverage includes: Data exploration of one variable and multivariate data Comparing two groups and many groups Permutation tests, randomization tests, and the independent samples t-Test Bootstrap tests and bootstrap intervals Interval estimates and effect sizes Throughout the book, the authors incorporate data from real-world research studies as well aschapter problems that provide a platform to perform data analyses. A related Web site features a complete collection of the book's datasets along with the accompanying codebooks and the R script files and commands, allowing readers to reproduce the presented output and plots. Comparing Groups: Randomization and Bootstrap Methods Using R is an excellent book for upper-undergraduate and graduate level courses on statistical methods, particularlyin the educational and behavioral sciences. The book also serves as a valuable resource for researchers who need a practical guide to modern data analytic and computational methods. "This book, written by three behavioral scientists for other behavioral scientists, addresses common issues in statistical analysis for the behavioral and educational sciences. Modern Statistical & Computing Methods for the Behavioral and Educational Sciences using R emphasizes the direct link between scientific research questions and data analysis. Purposeful attention is paid to the integration of design, statistical methodology, and computation to propose answers to specific research questions. Furthermore, practical suggestions for the analysis and presentation of results, in prose, tables and/or figures, are included. Optional sections for each chapter include methodological extensions for readers desiring additional technical details. Rather than focus on mathematical calculations like so many other introductory texts in the behavioral sciences, the authors focus on conceptual explanations and the use of statistical computing. Statistical computing is an integral part of statistical work, and to support student learning in this area, examples using the R computer program are provided throughout the book. Rather than relegate examples to the end of chapters, the authors interweave computer examples with the narrative of the book. Topical coverage includes an introduction to R, data exploration of one variable, data exploration of multivariate data - comparing two groups and many groups, permutation and randomization tests, the independent samples t-Test, the Bootstrap test, interval estimates and effect sizes, power, and dependent samples"-- Provided by publisher. CoverPage......Page 1 FrontMatter......Page 2 TitlePage......Page 4 CopyRight......Page 5 Contents......Page 6 List of Figures......Page 14 List of Tables......Page 22 Foreword......Page 24 Preface......Page 26 Acknowledgements......Page 32 ch01 AN INTRODUCTION TO R......Page 34 ch02 DATA REPRESENTATION AND PREPARATION......Page 54 ch03 DATA EXPLORATION: ONE VARIABLE......Page 82 ch04 EXPLORATION OF MULTIVARIATE DATA: COMPARING TWO GROUPS......Page 100 ch05 EXPLORATION OF MULTIVARIATE DATA: COMPARING MANY GROUPS......Page 128 ch06 RANDOMIZATION AND PERMUTATION TESTS......Page 150 ch07 BOOTSTRAP TESTS......Page 172 ch08 PHILOSOPHICAL CONSIDERATIONS......Page 206 ch09 BOOTSTRAP INTERVALS AND EFFECT SIZES......Page 214 ch10 DEPENDENT SAMPLES......Page 240 ch11 PLANNED CONTRASTS......Page 262 ch12 UNPLANNED CONTRASTS......Page 288 References......Page 320