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The Theory and Practice of Item Response Theory

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Overview

Item response theory (IRT) is a latent variable modeling approach used to minimize bias and optimize the measurement power of educational and psychological tests and other psychometric applications.

Designed for researchers, psychometric professionals, and advanced students, this book clearly presents both the "how-to" and the "why" of IRT. It describes simple and more complex IRT models and shows how they are applied with the help of widely available software packages. Chapters follow a consistent format and build sequentially, taking the reader from model development through the fit analysis and interpretation phases that one would perform in practice. The use of common empirical data sets across the chapters facilitates understanding of the various models and how they relate to one another.

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Editorial Reviews

From the Publisher

"This book is jam-packed with useful information. It includes basic, practical programming examples, with clear explanations of WinSTEPS and BILOG scripts, and step-by-step interpretations of goodness of fit in IRT problems. The author also covers more advanced forms of IRT, including multicategory items, multidimensional latent influences, and advanced multiple-group problems of linking and equating. A tour de force!"--John J. McArdle, PhD, Head, Quantitative Methods Area, Department of Psychology, University of Southern California
 
"A very well-organized and useful introduction to IRT. The book has an excellent structure that covers widely used IRT models and most of their major applications. The author has done an outstanding job of balancing the mathematical with the conceptual, and each chapter contains examples of applications to real data using commercially available software. The book is liberally supplemented by the kinds of graphic displays that can help neophytes understand the complexities of IRT. An especially useful feature is the up-front glossary of notation and acronyms. This is an excellent text for a one-semester graduate-level course in IRT, and should provide students with the knowledge they require to delve deeper into IRT models and their applications. It is also a useful reference for psychological and educational researchers who apply IRT in their work."--David J. Weiss, PhD, Department of Psychology, University of Minnesota; Editor Emeritus, Applied Psychological Measurement
 
"This book provides a thorough overview of item response theory methodology, with a nice blend of theoretical psychometrics and practical applications. The coverage is quite complete, including the standard dichotomous and polytomous unidimensional models as well as multidimensional models. The examples are very useful. This book will serve very well as a technical reference and as a text for upper-level psychometric theory courses."--Mark D. Reckase, PhD, Department of Counseling, Educational Psychology, and Special Education, Michigan State University
 
"De Ayala does a masterful job of describing the fundamental theory and the many applications of IRT. I am impressed by the breadth of models he covers and the detail he presents on various estimation methods. Coverage includes the standard Rasch; one-, two-, and three-parameter models; polytomous and multidimensional models; and applications to linking/equating and differential item functioning. This is a well-written book that will be useful for graduate students, researchers, and practicing measurement specialists in education, health, and psychology. The greatest strength of this book is de Ayala's ability to present IRT in an engaging, accessible manner."--Bruno D. Zumbo, PhD, Measurement, Evaluation, and Research Methodology Program, and Department of Statistics, University of British Columbia, Canada
 
"Offers a good roadmap to the complex array of IRT model parameters, estimation methods, and readily available IRT programs. By juxtaposing algebraic development of IRT models (and model estimation) alongside annotated results and software output from applied examples, this book provides an excellent resource for both intermediate and advanced IRT practitioners. The applied researcher will find this book to be an excellent practical resource with numerous examples that use multiple software packages to analyze the same datasets."--Scott M. Hofer, PhD, Department of Human Development and Family Sciences, Oregon State University
 
"The book has an excellent balance among the technical, conceptual, and practical aspects of item response theory. It is comprehensive; provides example scripts and output from a variety of popular item response programs; and uses selected data sets throughout the book, making model and program comparisons possible. I also liked the coverage of commonly asked questions related to model fit, item fit, and appropriate sample sizes, which are often missing in item response theory texts."--Kevin J. Grimm, PhD, Department of Psychology, University of California, Davis

Psychometrika

"The main strength of the text is in the descriptions and elaborations of the common IRT models....De Ayala also covers fundamental relationships that exist between models, such as the relationships between the parameters of the nominal response model and the partial credit model. In addition, the chapters contain practical advice for sample sizes commonly used with each model and how to interpret the parameters. De Ayala also presents results as statistical indices and graphics for various examples across different contexts, which allows readers the ability to see how the models work from several different perspectives....Does a good job of introducing common estimation strategies employed in IRT software packages. Especially helpful are the illustrations de Ayala includes with the code from IRT software packages."--Psychometrika
Journal of Educational Measurement

"A must read for practitioners who use item response theory to calibrate test data. It also would serve as a tremendous resource for measurement researchers who daily navigate the circuitous paths of various IRT estimation software programs to analyze and understand their assessment data....Each of the 12 chapters is packed with annotated examples of how to use IRT estimation software and the subsequent output....The author does an excellent job of supplementing explanations of various models with calibration examples and output of multiple data sets using several different IRT calibration software programs including BILOG, MULTILOG, BIGSTEPS, and NOHARM....The book is more practitioner-oriented and applied than previous classic books that provide foundational understanding of IRT models and applications....Would be an excellent text for a graduate level IRT class in which the goal of the course would be to review dichotomous, polytomous, and multidimensional IRT models an how to estimate parameters in the various models using a variety of commercially available software....I would encourage all testing practitioners who work with various IRT models, as well as graduate students who plan to go into the measurement field, to seriously consider this book. It is an excellent resource book and one that provides the reader with insight into the rationale and application of the different IRT models. I applaud Dr. de Ayala for all the time and effort he has put into this book. He has clearly done the measurement field a great service."--Journal of Educational Measurement
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Product Details

  • ISBN-13: 9781593858698
  • Publisher: Guilford Publications, Inc.
  • Publication date: 1/20/2009
  • Series: Methodology In The Social Sciences Series
  • Edition description: New Edition
  • Pages: 448
  • Sales rank: 1,302,609
  • Product dimensions: 7.20 (w) x 10.10 (h) x 1.10 (d)

Meet the Author

R. J. de Ayala is Professor of Educational Psychology at the University of Nebraska-Lincoln. His research interests include psychometrics, item response theory, computerized adaptive testing, applied statistics, and multilevel models. His work has appeared in Applied Psychological Measurement, Applied Measurement in Education, the British Journal of Mathematical and Statistical Psychology, Educational and Psychological Measurement, the Journal of Applied Measurement, and the Journal of Educational Measurement. He is a Fellow of the American Psychological Association’s Division 5: Evaluation, Measurement, and Statistics, as well as of the American Educational Research Association.

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Table of Contents

Symbols and Acronyms

1. Introduction to Measurement

Measurement

Some Measurement Issues

Item Response Theory

Classical Test Theory

Latent Class Analysis

Summary

2. The One-Parameter Model

Conceptual Development of the Rasch Model

The One-Parameter Model

The One-Parameter Logistic Model and the Rasch Model

Assumptions underlying the Model

An Empirical Data Set: The Mathematics Data Set

Conceptually Estimating an Individual's Location

Some Pragmatic Characteristics of Maximum Likelihood Estimates

The Standard Error of Estimate and Information

An Instrument's Estimation Capacity

Summary

3. Joint Maximum Likelihood Parameter Estimation

Joint Maximum Likelihood Estimation

Indeterminacy of Parameter Estimates

How Large a Calibration Sample?

Example: Application of the Rasch Model to the Mathematics Data, JMLE

Summary

4. Marginal Maximum Likelihood Parameter Estimation

Marginal Maximum Likelihood Estimation

Estimating an Individual's Location: Expected A Posteriori

Example: Application of the Rasch Model to the Mathematics Data, MMLE

Metric Transformation and the Total Characteristic Function

Summary

5. The Two-Parameter Model

Conceptual Development of the Two-Parameter Model

Information for the Two-Parameter Model

Conceptual Parameter Estimation for the 2PL Model

How Large a Calibration Sample?

Metric Transformation, 2PL Model

Example: Application of the 2PL Model to the Mathematics Data, MMLE

Information and Relative Efficiency

Summary

6. The Three-Parameter Model

Conceptual Development of the Three-Parameter Model

Additional Comments about the Pseudo-Guessing Parameter, cj

Conceptual Estimation for the 3PL Model

How Large a Calibration Sample?

Assessing Conditional Independence

Example: Application of the 3PL Model to the Mathematics Data, MMLE

Assessing Person Fit: Appropriateness Measurement

Information for the Three-Parameter Model

Metric Transformation, 3PL Model

Handling Missing Responses

Issues to Consider in Selecting among the 1PL, 2PL, and 3PL Models

Summary

7. Rasch Models for Ordered Polytomous Data

Conceptual Development of the Partial Credit Model

Conceptual Parameter Estimation of the PC Model

Example: Application of the PC Model to a Reasoning Ability Instrument, MMLE

The Rating Scale Model

Conceptual Estimation of the RS Model

Example: Application of the RS Model to an Attitudes toward Condom Scale, JMLE

How Large a Calibration Sample?

Information for the PC and RS Models

Metric Transformation, PC and RS Models

Summary

8. Non-Rasch Models for Ordered Polytomous Data

The Generalized Partial Credit Model

Example: Application of the GPC Model to a Reasoning Ability Instrument, MMLE

Conceptual Development of the Graded Response Model

How Large a Calibration Sample?

Example: Application of the GR Model to an Attitudes toward Condom Scale, MMLE

Information for Graded Data

Metric Transformation, GPC and GR Models

Summary

9. Models for Nominal Polytomous Data

Conceptual Development of the Nominal Response Model

How Large a Calibration Sample?

Example: Application of the NR Model to a Science Test, MMLE

Example: Mixed Model Calibration of the Science Test—NR and PC Models, MMLE

Example: NR and PC Mixed Model Calibration of the Science Test, Collapsed Options, MMLE

Information for the NR Model

Metric Transformation, NR Model

Conceptual Development of the Multiple-Choice Model

Example: Application of the MC Model to a Science Test, MMLE

Example: Application of the BS Model to a Science Test, MMLE

Summary

10. Models for Multidimensional Data

Conceptual Development of a Multidimensional IRT Model

Multidimensional Item Location and Discrimination

Item Vectors and Vector Graphs

The Multidimensional Three-Parameter Logistic Model

Assumptions of the MIRT Model

Estimation of the M2PL Model

Information for the M2PL Model

Indeterminacy in MIRT

Metric Transformation, M2PL Model

Example: Application of the M2PL Model, Normal-Ogive Harmonic Analysis Robust Method

Obtaining Person Location Estimates

Summary

11. Linking and Equating

Equating Defined

Equating: Data Collection Phase

Equating: Transformation Phase

Example: Application of the Total Characteristic Function Equating

Summary

12. Differential Item Functioning

Differential Item Functioning and Item Bias

Mantel–Haenszel Chi-Square

The TSW Likelihood Ratio Test

Logistic Regression

Example: DIF Analysis

Summary

Appendix A. Maximum Likelihood Estimation of Person Locations

Estimating an Individual's Location: Empirical Maximum Likelihood Estimation

Estimating an Individual's Location: Newton's Method for MLE

Revisiting Zero Variance Binary Response Patterns

Appendix B. Maximum Likelihood Estimation of Item Locations

Appendix C. The Normal Ogive Models

Conceptual Development of the Normal Ogive Model

The Relationship between IRT Statistics and Traditional Item Analysis Indices

Relationship of the Two-Parameter Normal Ogive and Logistic Models

Extending the Two-Parameter Normal Ogive Model to a Multidimensional Space

Appendix D. Computerized Adaptive Testing

A Brief History

Fixed-Branching Techniques

Variable-Branching Techniques

Advantages of Variable-Branching over Fixed-Branching Methods

IRT-Based Variable-Branching Adaptive Testing Algorithm

Appendix E. Miscellanea

Linear Logistic Test Model (LLTM)

Using Principal Axis for Estimating Item Discrimination

Infinite Item Discrimination Parameter Estimates

Example: NOHARM Unidimensional Calibration

An Approximate Chi-Square Statistic for NOHARM

Mixture Models

Relative Efficiency, Monotonicity, and Information

FORTRAN Formats

Example: Mixed Model Calibration of the Science Test–NR and 2PL Models, MMLE

Example: Mixed Model Calibration of the Science Test–NR and GR Models, MMLE

Odds, Odds Ratios, and Logits

The Person Response Function

Linking: A Temperature Analogy Example

Should DIF Analyses Be Based on Latent Classes?

The Separation and Reliability Indices

Dependency in Traditional Item Statistics and Observed Scores

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