The standard error in the Jacobson and Truax Reliable Change Index: The classical approach to the assessment of reliable change

Gerard H. Maassen

130 citations0/0 files storedJournal of the International Neuropsychological Society

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Psychometric Methodologies and Testing Psychological Testing and Assessment Reliability and Agreement in Measurement

Abstract

Researchers and clinicians using Jacobson and Truax's index to assess the reliability of change in patients, or its counterpart by Chelune et al., which takes practice effects into account, are confused by the different ways of calculating the standard error encountered in the literature (see the discussion started in this journal by Hinton-Bayre). This article compares the characteristics of (1) the standard error used by Jacobson and Truax, (2) the standard error of difference scores used by Temkin et al. and (3) an adaptation of Jacobson and Truax's approach that accounts for difference between initial and final variance. It is theoretically demonstrated that the last variant is preferable, which is corroborated by real data.

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References

1969Statistical Theories of Mental Test Scores 1991Clinical significance: A statistical approach to defining meaningful change in psychotherapy research.1991Clinical significance: A statistical approach to defining meaningful change in psychotherapy research.1984Psychotherapy outcome research: Methods for reporting variability and evaluating clinical significance 1986A method of assessing change in a single subject: An alteration of the RC index 1999Test–retest reliability and practice effects of Expanded Halstead–Reitan Neuropsychological Test Battery 1999Detecting significant change in neuropsychological test performance: A comparison of four models 1993“TScores for Change”: An illustration of a regression approach to depicting change in clinical neuropsychology

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