The unreliable change of reliable change indices

The classic method for assessment of reliable change, in 1991 re-introduced as Jacobson's RC, can be characterized as a confidence interval method. In recent years, several RC indices have been proposed using Kelley's (1947) (Kelley, T. L. (1947). Fundamentals of statistics. Cambridge: Har...

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Published in:Behaviour research and therapy 2001-04, Vol.39 (4), p.495-498
Main Author: Maassen, Gerard H.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Change scores
Confidence Intervals
Data Interpretation, Statistical
Estimates
Fundamental and applied biological sciences. Psychology
Humans
Kelley's estimate
Kelley, T L
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Psychometrics. Statistics. Methodology
Reliability
Reliable change indices
Reproducibility of Results
Statistics
Statistics. Mathematics
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description The classic method for assessment of reliable change, in 1991 re-introduced as Jacobson's RC, can be characterized as a confidence interval method. In recent years, several RC indices have been proposed using Kelley's (1947) (Kelley, T. L. (1947). Fundamentals of statistics. Cambridge: Harvard University Press) formula for estimating true change. In these proposals, interval estimation and confidence intervals are mixed up, which leads to unjustified probability statements. When Kelley's estimate is correctly expanded into a normal distributed statistic, the classic approach reveals itself as a large sample approximation of a properly constructed RCI based on Kelley's formula. Researchers should continue using the classic approach for the determination of reliable change.
doi_str_mv 10.1016/S0005-7967(00)00029-2
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source Applied Social Sciences Index & Abstracts (ASSIA); Elsevier:Jisc Collections:Elsevier Read and Publish Agreement 2022-2024:Freedom Collection (Reading list)
subjects Biological and medical sciences
Change scores
Confidence Intervals
Data Interpretation, Statistical
Estimates
Fundamental and applied biological sciences. Psychology
Humans
Kelley's estimate
Kelley, T L
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Psychometrics. Statistics. Methodology
Reliability
Reliable change indices
Reproducibility of Results
Statistics
Statistics. Mathematics
title The unreliable change of reliable change indices
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