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ERIC Number: EJ785188
Record Type: Journal
Publication Date: 2007-Sep
Pages: 6
Abstractor: Author
Reference Count: 0
ISSN: ISSN-0033-3123
A Measure for the Reliability of a Rating Scale Based on Longitudinal Clinical Trial Data
Laenen, Annouschka; Alonso, Ariel; Molenberghs, Geert
Psychometrika, v72 n3 p443-448 Sep 2007
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.
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Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A