TILASTOTIETEELLISIÄ TUTKIMUKSIA STATISTISKA UNDERSÖKNINGAR 17 STATISTICAL RESEARCH REPORTS KIMMO VEHKALAHTI RELIABILITY OF MEASUREMENT SCALES Tarkkonen’s general method supersedes Cronbach’s alpha SUOMEN TILASTOSEURA STATISTISKA SAMFUNDET I FINLAND THE FINNISH STATISTICAL SOCIETY HELSINKI 2000 Kimmo Vehkalahti Licentiate of Social Sciences RELIABILITY OF MEASUREMENT SCALES Tarkkonen’s general method supersedes Cronbach’s alpha Academic dissertation to be publicly discussed, with permission of the Faculty of Social Sciences at the University of Helsinki, in the small hall (pieni juhlasali), University main building, on the 25th of November, 2000, at 10 o’clock. HELSINKI 2000 The author’s address: Department of Statistics P.O. Box 54 (Unioninkatu 37) FIN-00014 University of Helsinki, Finland http://www.helsinki.fi/people/Kimmo.Vehkalahti
[email protected] Created from cover to cover using Survo, an environment for creative processing of text and numerical data. http://www.helsinki.fi/survo/ Printed version ISBN 952-91-2818-5 ISSN 0356-3499 TUMMAVUOREN KIRJAPAINO OY VANTAA 2000 PDF version ISBN 952-91-2819-3 http://ethesis.helsinki.fi/ HELSINGIN YLIOPISTON VERKKOJULKAISUT HELSINKI 2000 STATISTICAL RESEARCH REPORTS 17 Published by the Finnish Statistical Society RELIABILITY OF MEASUREMENT SCALES Tarkkonen’s general method supersedes Cronbach’s alpha by Kimmo Vehkalahti Department of Statistics, University of Helsinki, Finland HELSINKI 2000 Abstract Kimmo Vehkalahti: Reliability of measurement scales: Tarkkonen’s general method supersedes Cronbach’s alpha. Dissertation, University of Helsinki, 116pp. Finnish Statistical Society, Helsinki 2000. ISBN 952-91-2818-5 Methods for assessing the reliability of measurement scales were investigated. Reliability, which is defined as the ratio of the true variance to the total variance, is an important property of measurement.