Against coefficient of variation for estimation of intraindividual variability with accuracy measures

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Etat: Serval
Version: Final published version
ID Serval
serval:BIB_749D963F46DD
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Against coefficient of variation for estimation of intraindividual variability with accuracy measures
Périodique
Tutorials in Quantitative Methods for Psychology
Auteur(s)
Golay P., Fagot D., Lecerf T.
ISSN
1913-4126
Statut éditorial
Publié
Date de publication
2013
Peer-reviewed
Oui
Volume
9
Numéro
1
Pages
6-14
Langue
anglais
Résumé
Previous studies have shown that intraindividual variability (iV) in performance is an
important indicator of individual's cognitive functioning and neurological integrity.
While most experiments have examined iV of performance using Reaction Time data
(RTs), few studies have considered it with accuracy measures (e.g. number /
percentage of correct responses). For these two types of measures, intraindividual
standard deviation (iSD) or intraindividual coefficient of variation (iCV;
intraindividual standard deviation divided by the individual mean) were used as
indicators of iV in performance. However, because accuracy data have a lower and an
upper bound (in contrast to RTs), we illustrate both formally and with simulated data,
that the iCV cannot be used with accuracy measures. We also show that the coefficient
iCV is influenced by the number of items which is an issue when dealing with missing
data. We further provide formulas that may help researchers to visualize and correctly
interpret their data using any spreadsheet software. The current article finally
proposes an alternative coefficient (zeta) to examine iV in performance with accuracy
measures that shows similar behaviour as does iCV with RTs data.
Mots-clé
descriptive statistics, coefficient of variation, accuracy measure,
Création de la notice
23/09/2013 12:50
Dernière modification de la notice
03/03/2018 18:21
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