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Strategies to Approximate Random Sampling and Assignment (Pocket Guides to Social Work Research Methods) PDF

212 Pages·2009·2.96 MB·English
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Strategies to Approximate Random Sampling and Assignment P O C K E T G U I D E S T O SOCIAL WORK RESEARCH METHODS Series Editor Tony Tripodi, DSW Professor Emeritus, Ohio State University Determining Sample Size: Balancing Multiple Regression with Discrete Power, Precision, and Practicality Dependent Variables Patrick Dattalo John G. Orme and Terri C ombs-Orme Preparing Research Articles Bruce A. Th yer Developing Cross-Cultural Measurement Systematic Reviews and Th anh V. Tran Meta-Analysis Julia H. Littell, Jacqueline Corcoran, Intervention Research: and Vijayan Pillai Developing Social Programs Mark W. Fraser, Jack M. Richman, Historical Research Maeda J. Galinsky, Elizabeth Ann Danto and Steven H. Day Confi rmatory Factor Analysis Developing and Validating Donna Harrington Rapid Assessment Randomized Controlled Trials: Instruments Design and Implementation for Neil Abell, David W. Springer, and Community-Based Psychosocial Akihito Kamata Interventions Phyllis Solomon, Mary M. Clinical Data-Mining: Cavanaugh, and Jeff rey Draine Integrating Practice and Research Irwin Epstein Needs Assessment David Royse, Strategies to Approximate Michele Staton-Tindall, Random Sampling and Karen Badger, and Assignment J. Matthew Webster Patrick Dattalo PATRICK DATTALO Strategies to Approximate Random Sampling and Assignment 1 2010 1 Oxford University Press, Inc., publishes works that further Oxford University’s objective of excellence in research, scholarship, and education. Oxford New York Auckland Cape Town Dar es Salaam Hong Kong Karachi Kuala Lumpur Madrid Melbourne Mexico City Nairobi New Delhi Shanghai Taipei Toronto With offi ces in Argentina Austria Brazil Chile Czech Republic France Greece Guatemala Hungary Italy Japan Poland Portugal Singapore South Korea Switzerland Th ailand Turkey Ukraine Vietnam Copyright © 2010 by Oxford University Press, Inc. Published by Oxford University Press, Inc. 198 Madison Avenue, New York, New York 10016 www.oup.com Oxford is a registered trademark of Oxford University Press. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior permission of Oxford University Press. Library of Congress Cataloging-in-Publication Data Dattalo, Patrick. Strategies to approximate random sampling and assignment / Patrick Dattalo. p. cm. — (Pocket guides to social work research methods) Includes bibliographical references and index. ISBN 978-0-19-537835-1 1. Sampling (Statistics) 2. Social service—Statistical methods. 3. Social sciences—Statistical methods. I. Title. HA31.2.D383 2010 001.4′33—dc22 2009009573 1 3 5 7 9 8 6 4 2 Printed in the United States of America on acid-free paper For Debra This page intentionally left blank Contents 1 Basic Concepts and Assumptions 3 2 Methodological Alternatives and Supplements to Random Sampling 20 3 Statistical Alternatives and Supplements to Random Sampling 55 4 Methodological Alternatives and Supplements to Random Assignment 93 5 Statistical Alternatives and Supplements to Random Assignment 109 6 Summary and Conclusions 149 Glossary 165 Annotated Bibliography 171 References 187 Index 201 vii This page intentionally left blank Strategies to Approximate Random Sampling and Assignment

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Random sampling and random assignment are considered by many researchers to be the definitive methodological procedures for maximizing external and internal validity. However, there is a daunting list of legal, ethical, and practical barriers to implementing random sampling and random assignment. Wh
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