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Jörg Schorer Christel Weiβ 《Measurement in physical education and exercise science》2013,17(3):177-187
Generalizability theory was used to examine both the relative and absolute generalizability of the observed resistance, reactance, and phase angle measurements of total body bioelectrical impedance (Z) for men and women, using the Bioelectrical Impedance Analysis with modified electrode placement sites (Spectrum Lightweight Instrument; RJL Systems, Detroit, MI). Eighty men and 83 women from a military air force base volunteered as participants. RJL's rules for testing whole-body Z were followed with modification of the proximal electrode placement sites to the center of the antecubital space and popliteal fossa. The design was a 4-faceted crossed Person x Day x Occasion x Trial design treating all facets as random. Each participant was tested by 1 experienced tester on 2 days, 2 occasions, and 3 trials. Data were analyzed independently for each Z measurement anal each sex group. Overall, the modified electrode placement sites produced generalizability coefficients that were equal to or lower than the coefficients reported by Turner, Bouffard, and Lukaski (1996) using standard electrode placement sites. It is concluded that the standard method of measuring Z produces higher generalizability coefficients than the modified electrode placement method. 相似文献
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Science Letters:Crossover randomized controlled trial of the electronic version of the Chinese SF-36
CHEN Tian-hui LI Lu SIGLE Joerg M. DU Ya-ping WANG Hong-mei LEI Jun 《Journal of Zhejiang University. Science. B》2007,8(8)
Objectives:to verify the feasibility and reliability of the electronic version of Chinese SF-36 based on the Quality-of-Life-Recorder. Design: A crossover randomized controlled trial, comparing a paper-based and an electronic version of the Chinese SF-36, was conducted. According to generated random numbers, interviewees were asked to fill out either the electronic version or the paper version first. The second version was filled in after a pause of at least 10 min. Settings and participants: One group of 100 medical students at the School of Medicine of Zhejiang University and the other group of 50 outpatients at a clinic for general practice in Hangzhou City (China) were eventually recruited in this study. Results: The acceptance of the electronic version was good (60% of medical students and 84% of outpatients preferred the electronic version). At the level of eight-scale scores, the mean-difference for each scale (except for general health) between the two versions was less than 5%. At the level of 36 questions, the percentage of "exact agreement" ranged within 64%～99%; the percentage of "global agreement" ranged within 72%～99%; 77% of the kappa coefficients demonstrated "good/excellent agreement" and 23% of the kappa coefficients demonstrated "medium agreement". Conclusion: This study, for the first time, can provide empirical basis for the confirmation of the feasibility and reliability of the electronic version of the Chinese SF-36 and may provide an impulse towards widespread deployment of the Quality-of-Life-Recorder in Chinese populations. 相似文献
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The community size effect (or birthplace effect) suggests that high-performance athletes are less likely to emerge from regions with population sizes that are very small or very large. However, previous research on elite Canadian ice hockey players has not considered the influence of intra-national regional variation of population distributions with respect to community size effects. Therefore, the purpose of the current study was to test the heterogeneity of the community size effect between Canadian National Hockey League draftees (2000–2014: n = 1505), from 7 provincial regions within Canada (i.e., British Columbia, Alberta, Saskatchewan, Manitoba, Ontario, Quebec and the Atlantic Provinces). The proportion of athletes in the 9 census population categories were compared to the national and regional general population distributions in the census categories. Results suggest variability of community size effects between the 7 provincial regions within Canada, with only the province of Ontario demonstrating a community size effect congruent with effects reported in previous research. Using regional general population distributions as the comparator to athlete populations changed the direction, meaningfulness and magnitude of community size effects. In conclusion, elite ice hockey player community size effects may not be generalisable to all regions within Canada. 相似文献
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The process of annual age-grouping, applied most commonly in school and sport, has been shown to produce a developmental climate that provides advantages to some while disadvantaging others. This inequality has a number of important short- and long-term consequences known as relative age effects (RAEs). This review summarizes current knowledge regarding the origins of RAEs, their effects on skill acquisition and athlete development as well as possible solutions to this problem. The work done to date reinforces the conclusion that RAEs are remarkably complex and are underpinned by a number of social and procedural factors that make resolution of this inequality difficult. Throughout the review, we propose areas where further work is needed to improve our understanding of this phenomenon. 相似文献
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Joerg M. Meyer 《Teaching Statistics》2018,40(1):29-32
The contrary of stochastic independence splits up into two cases: pairs of events being favourable or being unfavourable. Examples show that both notions have quite unexpected properties, some of them being opposite to intuition. For example, transitivity does not hold. Stochastic dependence is also useful to explain cases of Simpson's paradox. 相似文献
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Joerg Evermann 《Structural equation modeling》2013,20(4):677-702
Multiple-group analysis in covariance-based structural equation modeling (SEM) is an important technique to ensure the invariance of latent construct measurements and the validity of theoretical models across different subpopulations. However, not all SEM software packages provide multiple-group analysis capabilities. The sem package for the R system, which holds an important position as the only open-source SEM software, does not currently offer multigroup analysis. This article offers an alternative to true multigroup modeling that is easy to understand and apply in the R software. It is limited, however, by the constraint that groups require equal sample size. 相似文献
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Joseph Baker Dan Koz Ann-Marie Kungl Jessica Fraser-Thomas Jörg Schorer 《High Ability Studies》2013,24(1):63-76
In an effort to understand the process of skill acquisition and decline, researchers have largely neglected a critical aspect of this development – maximizing time at the highest levels of achievement. This study examined length of career for professional athletes in basketball, football, ice hockey, and baseball and considers whether career length differed by position and player performance (standardized career performance). Results revealed career length differences among positions in baseball and football but not basketball and ice hockey. In all sports, longer careers were associated with superior performance, reinforcing the notion that performance is a critical indicator of career length and suggesting positional demands influence career length. Results highlight the need for further work on this important stage of development. 相似文献
29.
Crossover randomized controlled trial of the electronic version of the Chinese SF-36 总被引：1，自引：0，他引：1
Chen TH Li L Sigle JM Du YP Wang HM Lei J 《Journal of Zhejiang University. Science. B》2007,8(8):604-608
Objectives： to verify the feasibility and reliability of the electronic version of Chinese SF-36 based on the Quality-of-Life-Recorder. Design： A crossover randomized controlled trial, comparing a paper-based and an electronic version of the Chinese SF-36, was conducted. According to generated random numbers, interviewees were asked to fill out either the electronic version or the paper version first. The second version was filled in after a pause of at least 10 min. Settings and participants： One group of 100 medical students at the School of Medicine of Zhejiang University and the other group of 50 outpatients at a clinic for general practice in Hangzhou City （China） were eventually recruited in this study. Results： The acceptance of the electronic version was good （60% of medical students and 84% of outpatients preferred the electronic version）. At the level of eight-scale scores, the mean-difference for each scale （except for general health） between the two versions was less than 5%. At the level of 36 questions, the percentage of ＂exact agreement＂ ranged within 64%～99%; the percentage of ＂global agreement＂ ranged within 72%～99%; 77% of the kappa coefficients demonstrated ＂good/excellent agreement＂ and 23% of the kappa coefficients demonstrated ＂medium agreement＂. Conclusion： This study, for the first time, can provide empirical basis for the confirmation of the feasibility and reliability of the electronic version of the Chinese SF-36 and may provide an impulse towards widespread deployment of the Quality-of-Life-Recorder in Chinese populations. 相似文献
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Joerg Meyer 《Teaching Statistics》2019,41(1):14-17
A formula is derived for a ‘two‐dice horse race’, in which two ordinary dice are thrown repeatedly and each time the sum of the scores determines which horse (numbered 2 to 12) moves forward one space. This paper answers a question posed in a former Teaching Statistics article, and demonstrates the value of simulation. 相似文献