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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/7816

Title: A measure for the reliability of a rating scale based on longitudinal clinical trial data
Authors: Laenen, Annouschka
Alonso Abad, Ariel
Molenberghs, Geert
Issue Date: 2007
Publisher: SPRINGER
Citation: PSYCHOMETRIKA, 72(3). p. 443-448
Abstract: A new measure for reliability of a rating scale is introduced, based on the classical definition of reliability, as the ratio of the true score variance and the total variance. Clinical trial data can be employed to estimate the reliability of the scale in use, whenever repeated measurements are taken. The reliability is estimated from the covariance parameters obtained from a linear mixed model. The method provides a single number to express the reliability of the scale, but allows for the study of the reliability's time evolution. The method is illustrated using a case study in schizophrenia.
Notes: Univ Hasselt, Ctr Stat Agoralaan Gelouw D, B-3590 Diepenbeek, Belgium.Laenen, A, Univ Hasselt, Ctr Stat Agoralaan Gelouw D, B-3590 Diepenbeek, Belgium.annouschka.laenen@uhasselt.be
URI: http://hdl.handle.net/1942/7816
DOI: 10.1007/s11336-007-9002-7
ISI #: 000251153500010
ISSN: 0033-3123
Category: A1
Type: Journal Contribution
Validation: ecoom, 2008
Appears in Collections: Research publications

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