Mising Data A Gentle Introduction

Statisticians have made considerable progress in developing methodologies for dealing with missing data. However, these methods are not well known to social science researchers or to many graduate students in the behavioral sciences. This book systematically explores methods for classification for diagonosis and prevention of missing data problems. It provides step-by-step instructions analyzing data sets with some observations missing; reviews imputation methods and advises investigators on how to report on analyses when some participants have been lost to follow-up. This is an excellent book that will help behavioral science investigators handle analytical problems for virtually every study they conduct. ``

-Robert M. Kaplan, Department of Health Services, UCLA School of Public Health

``This book is full of useful information about methodological and statistical issues related to missing data. It includes clear definitions of types of missing data, ways to reduce their negative effects and analytical strategies for maximizing the use of all data? Even partial data? Collected in a research study. A unique strength of the book is its focus on missing data as a threat to the validity of a studies conclusions. Unlike other sources on missing data analysis, design approaches for preventing missing data are emphasized. More advanced statistical approaches to missing data analysis are also described clearly. This is a valuable, practical resource. ``

-David MacKinnon, Department of Psychology, Arizona State University

While most books on missing data focus on applying sophisticated statistical techniques to deal with the problem after it has occurred, this volume provides a methodology for the control and prevention of missing data. In clear, nontechnical language, the authors help the reader understand the different types of missing data and their implications for the reliability, validity and generalizability of a studies conclusions. They provide practical recommendations for designing studies that decrease the likelihood of missing data and for addressing this important issue when reporting study results. When statistical remedies are needed? Such as deletion procedures, augmentation methods and single imputation and multiple imputation procedures? The book also explains how to make sound decisions about their use.

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