![]() ![]() However, these measures remain sensitive to important clinical and functional outcomes. Measures characterized by greater true within-subject variability typically have lower test-retest reliability, requiring adequate powering in research examining group differences and longitudinal change. ![]() In this commentary we provide examples of stable, trait-like constructs which we would expect to remain highly consistent across longer time periods, and contrast these with measures which show acute within-subject change in response to contextual or psychological factors. However, after adopting a high threshold for adequate test-retest reliability, the authors report inadequate reliability for many measures. (Applied Neuropsychology: Adult, 2020), reporting test-retest reliability on the Cambridge Neuropsychological Test Automated Battery (CANTAB), with results that are in keeping with prior research on CANTAB and the broader cognitive assessment literature. Here we respond to the article by Karlsen et al. Test-retest reliability is essential to the development and validation of psychometric tools. ![]()
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