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

Philippe Golay; Delphine Fagot; Thierry Lecerf

doi:10.20982/tqmp.09.1.p006

Both Reaction Time and Accuracy Measures of Intraindividual Variability Predict Cognitive Performance in Alzheimer's Disease

Frontiers in Human Neuroscience ◽

10.3389/fnhum.2018.00124 ◽

2018 ◽

Vol 12 ◽

Cited By ~ 7

Author(s):

Björn U. Christ ◽

Marc I. Combrinck ◽

Kevin G. F. Thomas

Keyword(s):

Alzheimer’S Disease ◽

Alzheimer's Disease ◽

Reaction Time ◽

Cognitive Performance ◽

Intraindividual Variability ◽

Accuracy Measures

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Exploring changes in processing speed and intraindividual variability in youth following sports-related concussion

Journal of Concussion ◽

10.1177/2059700219839588 ◽

2019 ◽

Vol 3 ◽

pp. 205970021983958 ◽

Cited By ~ 1

Author(s):

Stephanie L Green ◽

Michelle L Keightley ◽

Nancy J Lobaugh ◽

Deirdre R Dawson ◽

Alex Mihailidis

Keyword(s):

Working Memory ◽

Reaction Time ◽

Processing Speed ◽

Coefficient Of Variation ◽

Response Times ◽

Reaction Times ◽

Sports Participation ◽

Intraindividual Variability ◽

Return To Sports ◽

Mean Reaction Time

Background Concussion represents a growing concern in sports participation for adults and youth alike. Studies exploring the neurocognitive sequelae of concussion, such as speed of processing typically compare mean reaction time scores to a control group. Intraindividual variability measures the consistency of reaction times between trials and has been previously explored in adults post-concussion. Some adult studies show increased variability following injury. Developmentally youth show higher intraindividual variability than adults, which may put them at higher risk of increased intraindividual variability change post-concussion. Exploring intraindividual variability may provide additional insight into fluctuating performance reported following injury. Despite preliminary findings of slowed reaction time in youth, a pre-/post-concussion comparison of intraindividual variability of reaction time has not been explored. Objective To describe and compare pre- and post-concussion measures of processing speed and intraindividual variability in youth. Methods A pre-/post-concussion design was used to compare mean reaction time and the coefficient of variation before and after sports-related concussion in 18 youth athletes aged 10–14 years using verbal and nonverbal working memory tasks. Pre-/post-concussion reaction time and coefficient of variation were compared using t-tests. Results The coefficient of variation for nonverbal working memory was significantly higher following concussion, but no changes in average reaction time were found. Conclusions Preliminary findings suggest that average response times are unchanged following concussion, but the fluctuation across response times is more variable during a nonverbal working memory task in youth. Increased variability in speed of reaction times could have implications for safe return to sports and reduced academic performance.

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The Effect of Mode of Transport on Intraindividual Variability in Glycemic and Insulinemic Response Testing

International Journal of Sport Nutrition and Exercise Metabolism ◽

10.1123/ijsnem.2017-0250 ◽

2018 ◽

Vol 28 (3) ◽

pp. 253-258

Author(s):

Alaaddine El-Chab ◽

Miriam E. Clegg

Keyword(s):

Coefficient Of Variation ◽

Acute Exercise ◽

Area Under The Curve ◽

Intraindividual Variability ◽

Moderate Intensity ◽

Glycemic Response ◽

Moderate Intensity Exercise ◽

Exercise Tests ◽

Mode Of Transport ◽

Response Testing

The effect of light- to moderate-intensity exercise, such as that used as a mode of transport, on glycemic response testing is unclear. The aim was to investigate the effect of acute exercise (walking and cycling), simulated to act as a mode of transport, prior to glycemic response testing on the intraindividual variability of blood glucose and insulin. A total of 11 male participants visited the laboratory four times. Initially, they undertook a maximum oxygen uptake and two submaximal exercise tests. For the other three visits, they either rested (25 min), cycled, or walked 5 km followed by a 2-hr glycemic response test after consuming a glucose drink (50 g of available carbohydrate). The mean coefficient of variation of each transport group was below the International Organization for Standardization cutoff of 30%. The highest mean coefficient of variation of glucose area under the curve (AUC) was between the rest and the walking trials (30%) followed by walking and cycling (26%). For insulin AUC, the highest mean coefficient of variation was between walking and cycling (28%) followed by rest and walking (24%). The lowest glucose AUC and insulin AUC were between rest and cycling (25% and 14%, respectively). This study did not find differences (p > .05) between the conditions for glucose AUC (at 120 min, rest: 134.5 ± 104.6 mmol/L; walking: 115.5 ± 71.7 mmol/L; and cycling: 142.5 ± 75 mmol/L) and insulin AUC (at 120 min, rest: 19.45 ± 9.12 μmol/ml; walking: 16.49 ± 8.42 μmol/ml; and cycling: 18.55 ± 9.23 μmol/ml). The results indicate no difference between the tests undertaken; however, further research should ensure the inclusion of two rest conditions.

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Intraindividual Variability in Development Within and Between Individuals

European Psychologist ◽

10.1027//1016-9040.6.3.187 ◽

2001 ◽

Vol 6 (3) ◽

pp. 187-193 ◽

Cited By ~ 47

Author(s):

John R. Nesselroade

Keyword(s):

Statistical Analysis ◽

Research Design ◽

Intraindividual Variability ◽

Factor Analytic

A focus on the study of development and other kinds of changes in the whole individual has been one of the hallmarks of research by Magnusson and his colleagues. A number of different approaches emphasize this individual focus in their respective ways. This presentation focuses on intraindividual variability stemming from Cattell's P-technique factor analytic proposals, making several refinements to make it more tractable from a research design standpoint and more appropriate from a statistical analysis perspective. The associated methods make it possible to study intraindividual variability both within and between individuals. An empirical example is used to illustrate the procedure.

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Emotional Variability Predicts Tiredness in Daily Life

Journal of Individual Differences ◽

10.1027/1614-0001/a000206 ◽

2016 ◽

Vol 37 (3) ◽

pp. 181-193 ◽

Cited By ~ 4

Author(s):

Aire Mill ◽

Anu Realo ◽

Jüri Allik

Keyword(s):

Sampling Method ◽

Daily Life ◽

Emotional Experience ◽

Experience Sampling ◽

Experience Sampling Method ◽

Building Blocks ◽

Intraindividual Variability ◽

Unique Role ◽

Over Time

Abstract. Intraindividual variability, along with the more frequently studied between-person variability, has been argued to be one of the basic building blocks of emotional experience. The aim of the current study is to examine whether intraindividual variability in affect predicts tiredness in daily life. Intraindividual variability in affect was studied with the experience sampling method in a group of 110 participants (aged between 19 and 84 years) during 14 consecutive days on seven randomly determined occasions per day. The results suggest that affect variability is a stable construct over time and situations. Our findings also demonstrate that intraindividual variability in affect has a unique role in predicting increased levels of tiredness at the momentary level as well at the level of individuals.

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