Shevlin, Mark, Miles, JNV and Bunting, Brendan (1997) Summated rating scales: A Monte Carlo investigation of the effects of reliability and collinearity in regression models. PERSONALITY AND INDIVIDUAL DIFFERENCES, 23 (4). pp. 665-676. [Journal article]
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The practice of combining the scores of multiple item scales, by adding, to form a single composite score is ubiquitous in psychological research. This study examines the effect of such practices in relation to a simple regression model by a series of Monte Carlo simulations. A comparison is made between the addition model and the factor model under varying conditions of reliability and collinearity. It is shown that the use of composite scores will generally tend to result in an underestimation of the population regression effect when the reliability of the items comprising the composite score is low. The use of a factor model results in estimates that are closer to the population value but at the expense of increasing standard errors as the reliability decreases. (C) 1997 Elsevier Science Ltd.
|Item Type:||Journal article|
|Faculties and Schools:||Faculty of Life and Health Sciences|
Faculty of Life and Health Sciences > School of Psychology
|Research Institutes and Groups:||Psychology Research Institute|
Psychology Research Institute > Health Psychology
Psychology Research Institute > Psychological Epidemiology and Mental Health
|Deposited By:||Mrs Fiona Harkin|
|Deposited On:||14 Dec 2009 14:42|
|Last Modified:||12 Mar 2012 16:44|
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