de Andrade Moral, Rafael and Díaz-Orueta, Unai and Oltra-Cucarella, Javier (2022) Logistic versus linear regression-based reliable change index: A simulation study with implications for clinical studies with different sample sizes. Psychological Assessment, 34 (8). pp. 731-741. ISSN 1040-3590

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Abstract

The linear regression-based reliable change index (RCI) is widely used to identify memory impairments through longitudinal assessment. However, the minimum sample size required for estimates to be reliable has never been specified. Using data from 920 participants from the Alzheimer's Disease Neuroimaging Initiative data as true parameters, we run 12,000 simulations for samples of size 10-1,000 and analyzed the percentage of times the estimates are significant, their coverage rate, and the accuracy of the models including both the true-positive rate and the true-negative rate. We compared the linear RCI with a logistic RCI for discrete, bounded scores. We found that the logistic RCI is more accurate than the linear RCI overall, with the linear RCI approximating the logistic RCI for samples of size 200 or greater. We provide an R package to compute the logistic RCI, which can be downloaded from the Comprehensive R Archive Network (CRAN) at https://cran.r-project.org/web/packages/LogisticRCI/, and the code to reproduce all results in this article at https://github.com/rafamoral/LogisticRCIpaper/. (PsycInfo Database Record (c) 2022 APA, all rights reserved).

Item Type:	Article
Keywords:	assessment; dementia; mild cognitive impairment; reliable change index; statistical models;
Academic Unit:	Assisting Living & Learning,ALL institute Faculty of Science and Engineering > Psychology Faculty of Science and Engineering > Research Institutes > Human Health Institute
Item ID:	18131
Identification Number:	https://doi.org/10.1037/pas0001138
Depositing User:	Unai Diaz-Orueta
Date Deposited:	13 Feb 2024 11:02
Journal or Publication Title:	Psychological Assessment
Publisher:	American Psychological Association
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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