scholarly journals Notational analysis in female grand slam tennis competitions

Kinesiology ◽  
2021 ◽  
Vol 53 (1) ◽  
pp. 154-161
Author(s):  
Alejandro Sánchez-Pay ◽  
José Antonio Ortega-Soto ◽  
Bernardino J. Sánchez-Alcaraz
Keyword(s):  
United States ◽  
Analysis Of Variance ◽  
The United States ◽  
Wilcoxon Test ◽  
Specific Training ◽  
Improve Performance ◽  
Test Analysis ◽  
Notational Analysis ◽  
Break Points ◽  
Post Hoc

Grand Slam tennis tournaments are played on different surfaces. The aims of the present study were to analyse the technical differences in the Grand Slam tournaments (Australian Open or AO, Roland Garros or RG, Wimbledon or W, and the United States Open or US), as well as to establish differences between winning and losing players. A total of 580 sets in 248 matches played in Grand Slams between 2017 and 2018 were analysed. To observe differences between the tournaments, a one-way analysis of variance (Kruskal Wallis) with the Bonferroni post-hoc test was performed. Univariate (Wilcoxon test) analysis of data was carried out to show the differences between the winning and losing performances of sets. Players who had more aces, points won on the 1st serve, winning shots and net points won more matches in the AO, W and US than in the RG (p<.05). However, in RG, players won more receiving points (43.56% of the points played) with chances to break the opponents’ service game. The results also showed that the winning players were superior in both service and receiving, and the most influential variables on the outcome of the match were percentage of receiving points won, break points won, and percentage of points won on the first serve. Such knowledge may have implications in the design of appropriate game strategies and specific training sessions to improve performance in professional women’s tennis.

Combining Reliability Coefficients: Toward Reliability Generalization of the Conceptions of Mathematics Questionnaire

2005 ◽  
Vol 96 (3) ◽  
pp. 627-634 ◽  
Author(s):  
Andile Mji ◽  
Haitham M. Alkhateeb
Keyword(s):  
United States ◽  
South Africa ◽  
Analysis Of Variance ◽  
The United States ◽  
Reliability Generalization ◽  
Variance Testing ◽  
The Difference ◽  
Post Hoc ◽  
Strength Of Association ◽  
Reliability Coefficients

The combined coefficient alpha from studies reporting the reliability of scores using the Conceptions of Mathematics Questionnaire were computed. Five studies comprising 898 participants were evaluated. A test of differences among the independent coefficients alpha was statistically significant (χ42 = 10.38, p = .04) for the Fragmented and (χ42 = 11.58, p = .02) for the Cohesive subscales. Post hoc comparisons showed the difference ( F129,299= 1.50, p = .003) was between Australia and Nigeria for the former and ( F155,157 = 1.54, p = .004) between South Africa and the United States for the latter alpha values. A one-way analysis of variance, testing for homogeneity among means within each subscale, indicated that these were homogeneous because the measure of the strength of association accounted for 10% of variability. As reliability coefficients were from homogeneous samples and alpha values were not different, the combined reliability is the best estimate of the population reliability for each subscale.

scholarly journals Higher Psoriasis Skin Clearance Is Associated with Lower Annual Indirect Costs in the United States: A Post Hoc Analysis from the CLEAR Study

2018 ◽  
Vol 24 (7) ◽  
pp. 617-622 ◽  
Author(s):  
Steven R. Feldman ◽  
Yang Zhao ◽  
Isabelle Gilloteau ◽  
Christopher N. Graham ◽  
LaStella Miles ◽  
...  
Keyword(s):  
United States ◽  
Indirect Costs ◽  
The United States ◽  
Post Hoc Analysis ◽  
Post Hoc

Rational and Intuitive Styles: Commensurability across Respondents' Characteristics

1997 ◽  
Vol 80 (1) ◽  
pp. 23-33 ◽  
Author(s):  
W. M. Taggart ◽  
Enzo Valenzi ◽  
Lori Zalka ◽  
Kevin B. Lowe
Keyword(s):  
United States ◽  
Multivariate Analysis ◽  
New Zealand ◽  
Ethnic Group ◽  
Analysis Of Variance ◽  
Training Programs ◽  
The United States ◽  
Assessment Tools ◽  
Industry Data ◽  
Birth Country

This study was designed to examine differences in responses to the six rational/intuitive scales of the Personal Style Inventory in relation to gender, age, ethnic group, birth country, occupation, and industry. Data were collected from 495 participants in training programs in Australia, England, New Zealand, and the United States. Multivariate analysis of variance indicated no differences among groups on the six scales which then are not sensitive to the characteristics so separate norming scores are not indicated. Lack of differences between sexes contrasts with the finding that women score more intuitive than men on other style assessment tools. Findings are not, however, consistent. And, since characteristics other than gender may show similar disparate results, further study of rational-intuitive commensurability is needed.

scholarly journals Consensus and conflict among ecological forecasts of Zika virus outbreaks in the United States

2017 ◽  
Author(s):  
Colin J. Carlson ◽  
Eric Dougherty ◽  
Mike Boots ◽  
Wayne Getz ◽  
Sadie Ryan
Keyword(s):  
United States ◽  
Zika Virus ◽  
The United States ◽  
Ecological Models ◽  
Alternative Methods ◽  
Consensus Method ◽  
Epidemiological Models ◽  
Ecological Niche Models ◽  
Short Term ◽  
Post Hoc

ABSTRACTEcologists are increasingly involved in the pandemic prediction process. In the course of the Zika outbreak in the Americas, several ecological models were developed to forecast the potential global distribution of the disease. Conflicting results produced by alternative methods are unresolved, hindering the development of appropriate public health forecasts. We compare ecological niche models and experimentally-driven mechanistic forecasts for Zika transmission in the continental United States, a region of high model conflict. We use generic and uninformed stochastic county-level simulations to demonstrate the downstream epidemiological consequences of conflict among ecological models, and show how assumptions and parameterization in the ecological and epidemiological models propagate uncertainty and produce downstream model conflict. We conclude by proposing a basic consensus method that could resolve conflicting models of potential outbreak geography and seasonality. Our results illustrate the unacceptable and often undocumented margin of uncertainty that could emerge from using any one of these predictions without reservation or qualification. In the short term, ecologists face the task of developing better post hoc consensus that accurately forecasts spatial patterns of Zika virus outbreaks. Ultimately, methods are needed that bridge the gap between ecological and epidemiological approaches to predicting transmission and realistically capture both outbreak size and geography.

scholarly journals Association between rotavirus gastroenteritis and intussusception: suggested evidence from a retrospective study in claims databases in the United States. Corresponding author: Corinne Willame, MPH, GSK, 20 Avenue Fleming, Wavre, Belgium

2019 ◽  
Author(s):  
Corinne Willame ◽  
Brigitte Cheuvart ◽  
Emmanuel Aris ◽  
Volker Vetter ◽  
Catherine Cohet
Keyword(s):  
United States ◽  
Sensitivity Analysis ◽  
Case Series ◽  
The United States ◽  
Temporal Association ◽  
Administrative Claims ◽  
Fracture Group ◽  
Rotavirus Gastroenteritis ◽  
Risk Period ◽  
Post Hoc

Abstract Background: The etiology of intussusception (IS), a serious medical condition of acute gastrointestinal obstruction, remains unclear. Limited evidence suggests a role for viral infections, including rotavirus infection. This study aimed to explore the risk of IS after rotavirus gastroenteritis (RV GE) in the first year of life, where the incidence of IS is highest. Methods: In this retrospective, self-controlled case series (SCCS), we assessed the risk of IS after RV GE in infants <1 year of age, using data extracted from administrative claims databases in the United States. Incidence rate ratios (IRR) of IS were calculated for the 7- and 21-day risk periods after RV GE (main analysis) or after fracture (sensitivity analysis using a control event) in subjects presenting with claims for these conditions. Post-hoc analyses were also performed. Results: Out of the 290,912,068 subjects screened, 42 subjects presented claims for RV GE and IS (RV GE group) and 66 presented claims for fracture and IS (fracture group). The IRR of IS after RV GE was 79.6 (95% confidence interval, CI: 38.6–164.4) in the 7-day risk period and 25.5 (95% CI: 13.2–49.2) in the 21-day risk period. The sensitivity analysis also showed an association between IS and fracture for the two risk periods: IRR was 6.1 (95% CI: 3.0–12.7) and 2.8 (95% CI: 1.5–5.4) in the 7- and 21-day risk periods, respectively, which suggested potential confounding such as by history of rotavirus vaccination, or a visit effect. Post-hoc analyses investigating these points did not confirm an association between fracture and IS, but still suggested a possible association between RV GE and IS. Conclusions: A temporal association between RV GE and IS was detected using the SCCS design in United States claims databases. However, due to some limitations identified through additional analyses, further studies are needed to confirm this association.

Acquisitions, Profitability, and Growth: A Study of Canadian Firms

2014 ◽  
Vol 15 (2) ◽  
pp. 98-117
Author(s):  
Igor Semenenko ◽  
Junwook Yoo
Keyword(s):  
United States ◽  
Precious Metals ◽  
The United States ◽  
High Tech ◽  
Improve Performance ◽  
Lower Growth ◽  
Acquisition Performance ◽  
Cross Border ◽  
Growth Prospects ◽  
Asset Size

Large acquisitions in the United States by Canadian firms lower growth prospects and profitability of Canadian companies. Results are driven by post-acquisition performance of the largest Canadian industries, including oil & gas, mining and precious metals, which together account for almost 40 percent of Canadian firms with asset size above 100 million reported in Compustat research files. Cross-border acquisitions of firms in high tech industries do not improve performance of Canadian firms.

scholarly journals Using Benchmarking Techniques and the 2011 Maternity Practices Infant Nutrition and Care (mPINC) Survey to Improve Performance among Peer Groups across the United States

2014 ◽  
Vol 30 (1) ◽  
pp. 31-40 ◽  
Author(s):  
Roger A. Edwards ◽  
Deborah Dee ◽  
Amna Umer ◽  
Cria G. Perrine ◽  
Katherine R. Shealy ◽  
...  
Keyword(s):  
United States ◽  
Infant Nutrition ◽  
Peer Groups ◽  
The United States ◽  
Improve Performance

Shock-Qualified Stern Tube Seal with Improved Capabilities and Reduced Total Ownership Cost

2018 ◽  
Author(s):  
S. Klepper ◽  
C. Ludlow ◽  
M. Spadafora
Keyword(s):  
United States ◽  
United States Navy ◽  
Galvanic Corrosion ◽  
The United States ◽  
Improve Performance ◽  
Propulsion Systems ◽  
Operational Conditions ◽  
Seal Failure ◽  
Littoral Combat Ship ◽  
Current Systems

Stern tube seals are a critical component in a ships propulsion system, sealing the shafts penetration through the hull. Stern tube seals can result in a significant maintenance burden when they are unable to handle the operational conditions of the vessel. Current systems are also lacking a capability to be able to operate through a primary seal failure, something that should be critical to the United States Navy. The United States Navy’s Independence-class littoral combat ship (LCS) has challenging operational conditions including the need to survive shock loads, high shaft speed and significant galvanic corrosion potential. Through a five-year effort the authors developed a stern tube seal for LCS that could handle the challenging operational conditions and provide the Navy with new critical capabilities such as the ability to operate propulsion systems through a primary seal failure without the use of packing and to extend maintenance windows to reduce vessel downtime and associated cost. This paper will present the limitations and challenges of existing stern tube seals, followed by the design improvements developed by the authors to improve performance and reliability while also reducing the total ownership cost for the U.S. Navy.

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