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The Hand. of Res. Synthesis & Meta-Analysis, 2nd Ed.

Harris Cooper, Larry V. Hedges, Jeffrey C. Valentine

Publication Year: 2009

When the first edition of The Handbook of Research Synthesis was published in 1994, it quickly became the definitive reference for researchers conducting meta-analyses of existing research in both the social and biological sciences. In this fully revised second edition, editors Harris Cooper, Larry Hedges, and Jeff Valentine present updated versions of the Handbook’s classic chapters, as well as entirely new sections reporting on the most recent, cutting-edge developments in the field. Research synthesis is the practice of systematically distilling and integrating data from a variety of sources in order to draw more reliable conclusions about a given question or topic. The Handbook of Research Synthesis and Meta-Analysis draws upon years of groundbreaking advances that have transformed research synthesis from a narrative craft into an important scientific process in its own right. Cooper, Hedges, and Valentine have assembled leading authorities in the field to guide the reader through every stage of the research synthesis process—problem formulation, literature search and evaluation, statistical integration, and report preparation. The Handbook of Research Synthesis and Meta-Analysis incorporates state-of-the-art techniques from all quantitative synthesis traditions. Distilling a vast technical literature and many informal sources, the Handbook provides a portfolio of the most effective solutions to the problems of quantitative data integration. Among the statistical issues addressed by the authors are the synthesis of non-independent data sets, fixed and random effects methods, the performance of sensitivity analyses and model assessments, and the problem of missing data. The Handbook of Research Synthesis and Meta-Analysis also provides a rich treatment of the non-statistical aspects of research synthesis. Topics include searching the literature, and developing schemes for gathering information from study reports. Those engaged in research synthesis will also find useful advice on how tables, graphs, and narration can be used to provide the most meaningful communication of the results of research synthesis. In addition, the editors address the potentials and limitations of research synthesis, and its future directions. The past decade has been a period of enormous growth in the field of research synthesis. The second edition Handbook thoroughly revises original chapters to assure that the volume remains the most authoritative source of information for researchers undertaking meta-analysis today. In response to the increasing use of research synthesis in the formation of public policy, the second edition includes a new chapter on both the strengths and limitations of research synthesis in policy debates and decisions. Another new chapter looks at computing effect sizes and standard errors from clustered data, such as schools or clinics. Authors also discuss updated techniques for locating hard-to-find “fugitive” literature, ways of systematically assessing the quality of a study, and progress in statistical methods for detecting and estimating the effects of publication bias. The Handbook of Research Synthesis and Meta-Analysis is an illuminating compilation of practical instruction, theory, and problem solving. This unique volume offers the reader comprehensive instruction in the skills necessary to conduct powerful research syntheses meeting the highest standards of objectivity. The significant developments included in the second edition will ensure that the Handbook remains the premier text on research synthesis for years to come.

Published by: Russell Sage Foundation

Title Page

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Copyright

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Contents

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pp. vii-ix

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Foreword

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pp. xi-xiii

The past decade has been a time of enormous growth in the need for and use of research syntheses in the social and behavioral sciences. The need was given impetus by the increase in social research that began in the 1960s and continues unabated today. ...

About the Authors

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pp. xv-xvi

PART I: Introduction

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1. Research Synthesis as a Scientific Process

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pp. 3-16

The moment we are introduced to science we are told it is a cooperative, cumulative enterprise. Like the artisans who construct a building from blueprints, bricks, and mortar, scientists contribute to a common edifice, called knowledge. ...

PART II: Formulating A Problem

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2. Hypotheses and Problems in Research Synthesis

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pp. 19-35

Texts on research methods often list sources of research ideas (see, for example, Cherulnik 2001). Sometimes ideas for research come from personal experiences, sometimes from pressing social issues. Sometimes a researcher wishes to test a theory meant to help...

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3. Statistical Considerations

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pp. 37-47

Research synthesis is an empirical process. As with any empirical research, statistical considerations have an influence at many points in the process. Some of these, such as how to estimate a particular effect parameter or establish its sampling uncertainty, are narrowly matters...

PART III: Searching the Literature

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4. Scientific Communication and Literature Retrieval

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pp. 51-71

Following analysts such as Russell Ackoff and his colleagues (1976), it is convenient to divide scientific communication into four modes: informal oral, informal written, formal oral, and formal written. The first two, exemplified by telephone conversations and mail among colleagues, are...

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5. Using Reference Databases

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pp. 73-101

The objective of this chapter is to introduce standard literature search tools and their use in research synthesis. Our focus is on research databases relevant to the social, behavioral, and medical sciences. We assume that the reader...

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6. Grey Literature

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pp. 103-125

The objective of this chapter, and of the original in the 1994 edition of this handbook, on which this one is based, is to provide methods of retrieving hard to find literature and information on particular areas of research.1 We begin by briefly outlining the many developments that have...

PART IV: Coding the Literature

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7. Judging the Quality of Primary Research

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pp. 129-146

Empirical studies vary in terms of the rigor with which they are conducted, and the quality of the studies comprising a research synthesis can have an impact on the validity of conclusions arising from that synthesis. However, the wide agreement on these points belies a fundamental...

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8. Identifying Interesting Variables and Analysis Opportunities

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pp. 147-158

Research synthesis relies on information reported in a selection of studies on a topic of interest. The purpose of this chapter is to examine the types of variables that can be coded from those studies and to outline the kinds of relationships that can be examined in the analysis of the...

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9. Systematic Coding

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pp. 159-176

A research synthesist has collected a set of studies that address a similar research question and wishes to code the studies to create a dataset suitable for meta-analysis. This task is analogous to interviewing, but a study rather than a person is interviewed. ...

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10. Evaluating Coding Decisions

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pp. 177-203

Coding is a critical part of research synthesis. It is an attempt to reduce a complex, messy, context-laden, and quantification-resistant reality to a matrix of numbers. Thus it will always remain a challenge to fit the numerical scheme to the reality, and the fit will never be perfect. ...

PART V: Statistically Describing Study Outcomes

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11. Vote-Counting Procedures in Meta-Analysis

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pp. 207-220

As the number of scientific studies continues to grow, it becomes increasingly important to integrate the results from these studies. One simple approach involves counting votes. In the conventional vote-counting procedure, one simply divides studies into three categories: those...

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12. Effect Sizes for Continuous Data

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pp. 221-235

In any meta-analysis, we start with summary data from each study and use it to compute an effect size for the study. An effect size is a number that reflects the magnitude of the relationship between two variables. For example, if a study reports the mean and standard deviation for the...

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13. Effect Sizes for Dichotomous Data

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pp. 237-253

In many studies measurements are made on binary (dichotomous) rather than numerical scales. Examples include studies of attitudes or opinions (the two categories for the response variable being agree or disagree with some statement), case-control studies in epidemiology (the two...

PART VI: Statistically Combining Effect Sizes

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14. Combining Estimates of Effect Size

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pp. 257-277

In 1896, Sir Almroth Wright—a colleague and mentor of Sir Alexander Fleming, who discovered penicillin— developed a vaccine to protect against typhoid (Susser 1977; see Roberts 1989). The typhoid vaccine was tested in several settings, and on the basis of these tests the vaccine...

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15. Analyzing Effect Sizes: Fixed-Effects Models

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pp. 279-293

A central question in research synthesis is whether methodological, contextual, or substantive differences in research studies are related to variation in effect-size parameters. ...

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16. Analyzing Effect Sizes: Random-Effects Models

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pp. 295-315

This volume considers the problem of quantitatively summarizing results from a stream of studies, each testing a common hypothesis. In the simplest case, each study yields a single estimate of the impact of some intervention. ...

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17. Correcting for the Distorting Effects of Study Artifacts in Meta-Analysis

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pp. 317-333

Every study has imperfections, many of which bias the results. In some cases we can define precisely what a methodologically ideal study would be like, and thus say that the effect size obtained from any real study will differ to some extent from the value that would have been...

PART VII: Special Statistical Issues and Problems

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18. Effect Sizes in Nested Designs

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pp. 337-355

Studies with nested designs are frequently used to evaluate the effects of social treatments, such as interventions, products, or technologies in education or public health. One common nested design assigns entire sites—often classrooms, schools, clinics, or communities—to the...

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19. Stochastically Dependent Effect Sizes

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pp. 357-376

Much of the literature on meta-analysis deals with analyzing effect sizes obtained from k independent studies in each of which a single treatment is compared with a control (or with a standard treatment). Because the studies are statistically independent, so are the effect sizes. ...

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20. Model-Based Meta-Analysis

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pp. 377-395

In this chapter I introduce model-based meta-analysis and update what is known about research syntheses aimed at examining models and questions more complex than those addressed in typical bivariate meta-analyses. I begin with the idea of model-based (or model-driven)...

PART VIII: Data Interpretation

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21. Handling Messing Data

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pp. 399-416

This chapter discusses what researchers can do when studies are missing the information needed for meta-analysis. Despite careful evaluation of coding decisions, researchers will find that studies in a research synthesis invariably differ in the types and quality of the information...

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22. Sensitivity Analysis and Diagnostics

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pp. 417-433

At every step in a research synthesis, decisions are made that can affect the conclusions and inferences drawn from that analysis. Sometimes a decision is easy to defend, such as one to omit a poor quality study from the meta-analysis based on prespecified exclusion criteria, or to...

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23. Publication Bias

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pp. 435-452

That the published scientific literature documents only a proportion of the results of all research carried out is a perpetual concern. Further, there is good direct and indirect evidence to suggest that the unpublished proportion may be systematically different from the published, since...

PART IX: Tying Research Synthesis to Substantive Issues

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24. Advantages of Certainty and Uncertainty

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pp. 455-472

A research synthesis typically is not an endpoint in the investigation of a topic. Rarely does a synthesis offer a definitive answer to the theoretical or empirical question that inspired the investigation. Instead, most research syntheses serve as way stations along a sometimes...

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25. Research Synthesis and Public Policy

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pp. 473-493

These three statements are based on some form of research syntheses. Each was motivated by different interests but all share a purpose—they were conducted to inform policy makers and practitioners about what works. Rather than relying on personal opinion, a consensus of experts,...

PART X: Reporting the Results

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26. Visual and Narrative Interpretation

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pp. 497-519

Meta-analyses in the social sciences and education often provide policy makers, practitioners, and researchers with critical new information that summarizes the central quantitative findings from a particular research literature. However, meta-analytic articles and reports are also rather...

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27. Reporting Format

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pp. 521-534

The other chapters in this handbook discuss the complexities and intricacies of conceptualizing and conducting research syntheses or systematic reviews. If these pieces of research are to be of most use to readers, they need to be reported in a clear way. ...

PART XI: Summary

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28. Threats to the Validity of Generalized Inferences

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pp. 537-560

This chapter provides a nonstatistical way of summarizing many of the main points in the preceding chapters. In particular, it takes the major assumptions outlined and translates them from formal statistical notation into ordinary English. ...

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29. Potentials and Limitations

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pp. 561-572

We suspect that readers of this volume have reacted to it in one of two ways: they have been overwhelmed by the number and complexity of the issues that face a research synthesist or they have been delighted to have a manual to help them through the synthesis process. ...

Glossary

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pp. 573-583

Appendix A: Data Sets

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pp. 585-589

Appendix B: Tables

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pp. 591-594

Index

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pp. 595-615


E-ISBN-13: 9781610441384
Print-ISBN-13: 9780871541635

Page Count: 632
Publication Year: 2009

Edition: 2nd ed.

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  • Research -- Statistical methods -- Handbooks, manuals, etc.
  • Research -- Methodology -- Handbooks, manuals, etc.
  • Information storage and retrieval systems -- Research -- Handbooks, manuals, etc.
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