Transcription of Statistical Power Analysis for the Behavioral Sciences
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Statistical Power Analysis for the Behavioral Sciences
Statistical Power Analysis for the Behavioral Sciences Second Edition Statistical Power Analysis for the Behavioral Sciences Second Edition Jacob Cohen Department of Psychology New York University New York, New York ~ LAWRENCE ERLBAUM ASSOCIATES, PUBLISHERS Copyright 1988 by Lawrence Erlbaum Associates All rights reserved. No part of this book may be reproduced in any form, by photostat, microform, retrieval system, or by any other means, without the prior written permission of the publisher. Library of Congress Cataloging-in-Publication Data Cohen, Jacob. Statistical Power Analysis for the Behavioral Sciences I Jacob Cohen. - 2nd ed. Bibliography: p. Includes index. ISBN 0-8058-0283-5 1. Social Sciences - Statistical methods. 2. Probabilities. I. Title. 1988 300'.
tect operationally defined small, medi~m, and large effect sizes [a meta-analysis before the term was coined (Bangert-Drowns, 1986)]. I found rather poor power, for example, a mean of .48 at the two-tailed .05 level for medium effect sizes. Since the publication of the first edition (1969), there have been two or
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