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https://www.readbyqxmd.com/read/27712116/estimation-of-the-coefficient-of-variation-with-minimum-risk-a-sequential-method-for-minimizing-sampling-error-and-study-cost
#1
Bhargab Chattopadhyay, Ken Kelley
The coefficient of variation is an effect size measure with many potential uses in psychology and related disciplines. We propose a general theory for a sequential estimation of the population coefficient of variation that considers both the sampling error and the study cost, importantly without specific distributional assumptions. Fixed sample size planning methods, commonly used in psychology and related fields, cannot simultaneously minimize both the sampling error and the study cost. The sequential procedure we develop is the first sequential sampling procedure developed for estimating the coefficient of variation...
August 11, 2016: Multivariate Behavioral Research
https://www.readbyqxmd.com/read/27428682/baseline-performance-and-psychometric-properties-of-the-child-sport-concussion-assessment-tool-3-child-scat3-in-5-to-13-year-old-athletes
#2
Lindsay D Nelson, Michelle M Loman, Ashley A LaRoche, Robyn E Furger, Michael A McCrea
OBJECTIVE: To determine the normative, baseline performance and psychometric properties of the Child Sport Concussion Assessment Tool 3 (Child-SCAT3) in 5- to 13-year-old athletes. DESIGN: Cross-sectional study. SETTING: Practice fields. PARTICIPANTS: Contact sport athletes (N = 155) 5 to 13 years old. INDEPENDENT VARIABLES: Age, gender, verbal intellectual functioning (receptive vocabulary). MAIN OUTCOME MEASURES: Child-SCAT3: self-reported and parent-reported symptoms, cognitive performance (child form of the Standardized Assessment of Concussion; SAC-C), and balance (modified Balance Error Scoring System, mBESS-C; tandem gait)...
July 15, 2016: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/27428677/assessment-of-the-postural-stability-of-female-and-male-athletes
#3
David R Howell, Emily Hanson, Dai Sugimoto, Andrea Stracciolini, William P Meehan
OBJECTIVE: Postural stability is often affected by sport-related injuries and subsequently evaluated during postinjury examinations. Intrinsic factors, however, may also affect postural control. We sought to compare the postural control of female and male athletes as measured simultaneously by (1) the modified balance error scoring system (mBESS) and (2) a video-force plate system. DESIGN: Cross-sectional study. SETTING: Sports injury prevention center...
July 15, 2016: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/27266445/evaluation-of-postural-stability-in-youth-athletes-the-relationship-between-two-rating-systems
#4
David R Howell, Benjamin J Shore, Emily Hanson, William P Meehan
OBJECTIVES: The Balance Error Scoring System (BESS) has been documented as a useful way to evaluate postural control following sport-related concussions sustained by youth athletes. However, limitations have been reported with its use due to the reliance on visual observation as the primary measurement outcome. The primary purpose of this study was to examine the correlation between the modified BESS (mBESS) as rated by a clinician and a simultaneous analysis performed by an integrated video-force plate system...
September 2016: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/27032923/the-sport-concussion-assessment-tool-a-systematic-review
#5
Aaron M Yengo-Kahn, Andrew T Hale, Brian H Zalneraitis, Scott L Zuckerman, Allen K Sills, Gary S Solomon
OBJECTIVE Over the last 2 decades, sport-related concussion (SRC) has garnered significant attention. Even with increased awareness and athlete education, sideline recognition and real-time diagnosis remain crucial. The need for an objective and standardized assessment of concussion led to the eventual development of the Sport Concussion Assessment Tool (SCAT) during the Second International Conference on Concussion in Sport in 2004, which is now in its third iteration (SCAT3). In an effort to update our understanding of the most well-known sideline concussion assessment, the authors conducted a systematic review of the SCAT and the evidence supporting its use to date...
April 2016: Neurosurgical Focus
https://www.readbyqxmd.com/read/26962759/confidence-intervals-for-population-reliability-coefficients-evaluation-of-methods-recommendations-and-software-for-composite-measures
#6
Ken Kelley, Sunthud Pornprasertmanit
A composite score is the sum of a set of components. For example, a total test score can be defined as the sum of the individual items. The reliability of composite scores is of interest in a wide variety of contexts due to their widespread use and applicability to many disciplines. The psychometric literature has devoted considerable time to discussing how to best estimate the population reliability value. However, all point estimates of a reliability coefficient fail to convey the uncertainty associated with the estimate as it estimates the population value...
March 2016: Psychological Methods
https://www.readbyqxmd.com/read/26911999/examination-of-age-related-differences-on-clinical-tests-of-postural-stability
#7
Erin O Breen, David R Howell, Andrea Stracciolini, Corey Dawkins, William P Meehan
BACKGROUND: The modified Balance Error Scoring System (mBESS) and Y-Balance Test are common clinical measurements of postural control, but little is known about the effect of age on performance of these tasks. The purpose of this study was to examine how healthy child and adolescent athletes perform on 2 common clinical measurements of postural control. HYPOTHESIS: Younger athletes would demonstrate poorer postural control compared with older athletes. STUDY DESIGN: Cross-sectional study...
February 24, 2016: Sports Health
https://www.readbyqxmd.com/read/26885560/vestibular-dysfunction-following-sub-concussive-head-impact
#8
Sungjae Hwang, Lei Ma, Keisuke Kawata, Ryan Tierney, John Jeka
Current thinking views mild head impact (i.e., subconcussion) as an under-recognized phenomenon that has the ability to cause significant current and future detrimental neurological effects. However, repeated mild impacts to the head often display no observable behavioral deficits based on standard clinical tests, which may lack sensitivity. The current study investigates the effects of sub-concussive impacts from soccer heading with innovative measures of vestibular function and walking stability in a pre-, 0-2 hour post-, 24 hour post-heading repeated measures design...
February 17, 2016: Journal of Neurotrauma
https://www.readbyqxmd.com/read/26863482/normative-values-for-a-video-force-plate-assessment-of-postural-control-in-athletic-children
#9
David R Howell, William P Meehan
The objective of this study was to provide normative data for young athletes during the three stances of the modified Balance Error Scoring System (mBESS) using an objective video-force plate system. Postural control was measured in 398 athletes between 8 and 18 years of age during the three stances of the mBESS using a video-force plate rating system. Girls exhibited better postural control than boys during each stance of the mBESS. Age was not significantly associated with postural control. We provide normative data for a video-force plate assessment of postural stability in pediatric athletes during the three stances of the mBESS...
July 2016: Journal of Pediatric Orthopedics. Part B
https://www.readbyqxmd.com/read/26771426/sample-size-planning-for-the-squared-multiple-correlation-coefficient-accuracy-in-parameter-estimation-via-narrow-confidence-intervals
#10
Ken Kelley
Methods of sample size planning are developed from the accuracy in parameter approach in the multiple regression context in order to obtain a sufficiently narrow confidence interval for the population squared multiple correlation coefficient when regressors are random. Approximate and exact methods are developed that provide necessary sample size so that the expected width of the confidence interval will be sufficiently narrow. Modifications of these methods are then developed so that necessary sample size will lead to sufficiently narrow confidence intervals with no less than some desired degree of assurance...
October 2008: Multivariate Behavioral Research
https://www.readbyqxmd.com/read/25159392/excitation-emission-matrix-fluorescence-coupled-to-chemometrics-for-the-exploration-of-essential-oils
#11
William Mbogning Feudjio, Hassen Ghalila, Mama Nsangou, Yvon G Mbesse Kongbonga, Youssef Majdi
Excitation-emission matrix fluorescence (EEMF) coupled to chemometrics was used to explore essential oils (EOs). The spectrofluorometer was designed with basic and inexpensive materials and was accompanied by appropriate tools for data pre-treatment. Excitation wavelengths varied between 320 nm and 600 nm while emission wavelengths were from 340 nm to 700 nm. Excitation-emission matrix (EEM) spectra of EOs presented different features, revealing the presence of varying fluorophores. EOs from the same species but from different origins presented almost the same spectra, showing the possibility that EEM spectra could be used as additional parameters in the standardisation of EOs...
December 2014: Talanta
https://www.readbyqxmd.com/read/24206726/classification-of-vegetable-oils-based-on-their-concentration-of-saturated-fatty-acids-using-laser-induced-breakdown-spectroscopy-libs
#12
Yvon G Mbesse Kongbonga, Hassen Ghalila, Marthe Boyomo Onana, Zohra Ben Lakhdar
Spectrochemical analyses of organic liquid media such as vegetable oils and sweetened water were performed with the use of LIBS. The aim of this work is to study, on the basis of spectral analyses by LIBS technique of "Swan band" of C2 emitted by different vegetable oils in liquid phase, the characteristics of each organic media. Furthermore this paper proposes, as a classification, a single parameter that could be used to determine the concentration of saturated fatty acids of vegetable oils. A Nd:YAG operating at λ=532 nm and an energies per pulse of 30 mJ was focused onto the surface of the liquid in ambient air...
March 15, 2014: Food Chemistry
https://www.readbyqxmd.com/read/22724611/evaluation-of-the-balance-error-scoring-system-bess-in-the-diagnosis-of-acute-mountain-sickness-at-4380%C3%A2-m
#13
Martin J Macinnis, Jim L Rupert, Michael S Koehle
Ascent to altitude is associated with a decrease in balance; however, the effect of acute mountain sickness (AMS) status on balance is variable depending on the test used and the altitude at which the test is performed. Here, we report preliminary findings on the relationship between the balance error scoring system (BESS) and AMS at the 2010 Janai Purnima festival at Gosainkunda, Nepal (4380 m). All subjects (n=37) completed a shortened BESS test (mBESS) while a subset completed the full BESS test (n=27)...
June 2012: High Altitude Medicine & Biology
https://www.readbyqxmd.com/read/22004142/accuracy-in-parameter-estimation-for-ancova-and-anova-contrasts-sample-size-planning-via-narrow-confidence-intervals
#14
COMPARATIVE STUDY
Keke Lai, Ken Kelley
Contrasts of means are often of interest because they describe the effect size among multiple treatments. High-quality inference of population effect sizes can be achieved through narrow confidence intervals (CIs). Given the close relation between CI width and sample size, we propose two methods to plan the sample size for an ANCOVA or ANOVA study, so that a sufficiently narrow CI for the population (standardized or unstandardized) contrast of interest will be obtained. The standard method plans the sample size so that the expected CI width is sufficiently small...
May 2012: British Journal of Mathematical and Statistical Psychology
https://www.readbyqxmd.com/read/21589668/associations-between-three-clinical-assessment-tools-for-postural-stability
#15
Richard C Clark, Casie E Saxion, Kenneth L Cameron, J Parry Gerber
STUDY DESIGN: Clinical Measurement, Correlation, Reliability OBJECTIVES: To assess the relationship between the Single Leg Balance (SLB), modified Balance Error Scoring System (mBESS), and modified Star Excursion Balance (mSEBT) tests and secondarily to assess inter-rater and test-retest reliability of these tests. BACKGROUND: Ankle sprains often result in chronic instability and dysfunction. Several clinical tests assess postural deficits as a potential cause of this dysfunction; however, limited information exists pertaining to the relationship that these tests have with one another...
September 2010: North American Journal of Sports Physical Therapy: NAJSPT
https://www.readbyqxmd.com/read/21417531/accuracy-in-parameter-estimation-for-targeted-effects-in-structural-equation-modeling-sample-size-planning-for-narrow-confidence-intervals
#16
Keke Lai, Ken Kelley
In addition to evaluating a structural equation model (SEM) as a whole, often the model parameters are of interest and confidence intervals for those parameters are formed. Given a model with a good overall fit, it is entirely possible for the targeted effects of interest to have very wide confidence intervals, thus giving little information about the magnitude of the population targeted effects. With the goal of obtaining sufficiently narrow confidence intervals for the model parameters of interest, sample size planning methods for SEM are developed from the accuracy in parameter estimation approach...
June 2011: Psychological Methods
https://www.readbyqxmd.com/read/18522056/an-r-package-to-compute-commonality-coefficients-in-the-multiple-regression-case-an-introduction-to-the-package-and-a-practical-example
#17
Kim Nimon, Mitzi Lewis, Richard Kane, R Michael Haynes
Multiple regression is a widely used technique for data analysis in social and behavioral research. The complexity of interpreting such results increases when correlated predictor variables are involved. Commonality analysis provides a method of determining the variance accounted for by respective predictor variables and is especially useful in the presence of correlated predictors. However, computing commonality coefficients is laborious. To make commonality analysis accessible to more researchers, a program was developed to automate the calculation of unique and common elements in commonality analysis, using the statistical package R...
May 2008: Behavior Research Methods
https://www.readbyqxmd.com/read/18183915/methods-for-the-behavioral-educational-and-social-sciences-an-r-package
#18
Ken Kelley
Methods for the Behavioral, Educational, and Social Sciences (MBESS; Kelley, 2007b) is an open source package for R (R Development Core Team, 2007b), an open source statistical programming language and environment. MBESS implements methods that are not widely available elsewhere, yet are especially helpful for the idiosyncratic techniques used within the behavioral, educational, and social sciences. The major categories of functions are those that relate to confidence interval formation for noncentral t, F, and chi2 parameters, confidence intervals for standardized effect sizes (which require noncentral distributions), and sample size planning issues from the power analytic and accuracy in parameter estimation perspectives...
November 2007: Behavior Research Methods
https://www.readbyqxmd.com/read/11591651/mouse-bac-ends-quality-assessment-and-sequence-analyses
#19
COMPARATIVE STUDY
S Zhao, S Shatsman, B Ayodeji, K Geer, G Tsegaye, M Krol, E Gebregeorgis, A Shvartsbeyn, D Russell, L Overton, L Jiang, G Dimitrov, K Tran, J Shetty, J A Malek, T Feldblyum, W C Nierman, C M Fraser
A large-scale BAC end-sequencing project at The Institute for Genomic Research (TIGR) has generated one of the most extensive sets of sequence markers for the mouse genome to date. With a sequencing success rate of >80%, an average read length of 485 bp, and ABI3700 capillary sequencers, we have generated 449,234 nonredundant mouse BAC end sequences (mBESs) with 218 Mb total from 257,318 clones from libraries RPCI-23 and RPCI-24, representing 15x clone coverage, 7% sequence coverage, and a marker every 7 kb across the genome...
October 2001: Genome Research
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