scholarly journals A Comparison of the Technique of the 180° Cutting Maneuver Performed on Grass and on a Hardwood Floor

2018 ◽  
Vol 7 (4) ◽  
pp. 22-35
Author(s):  
Brad Gerbrandt ◽  
Marion Joyce Alexander ◽  
David Telles-Langdon
Keyword(s):  
Turning Point ◽  
Body Position ◽  
Stepwise Multiple Regression ◽  
Test Time ◽  
Change Of Direction ◽  
Independent Variables ◽  
Running Shoes ◽  
Forward Stepwise ◽  
Run Up ◽  
Highly Correlated

The 180º cutting maneuver (also known as the 505 drill) is commonly seen in field and court sports, and it consists of a 15 m run up to a turning point, followed by a timed stop and 180º change of direction for 5 m. The purpose of this study was to determine the most effective joint movements, limb velocities and body positions to perform the 180º cutting maneuver.  Additionally, the study compared the kinematics of the 505 drill performed indoors while wearing running shoes and outdoors while wearing cleats.  For this study, twelve athletes executed the 505 drill indoors while wearing running shoes, and twelve executed the 505 drill outdoors while wearing cleats.  Fifty nine independent variables were measured for each athlete and compared to the athlete’s time to complete the test.  Mean test time was 2.27 seconds for the indoor group and a significantly lower 2.47 s for the outdoor group. Correlation analysis and forward stepwise multiple regression analysis was performed on both groups to determine which variables were significantly related to test time.  Trunk forward lean at push off of the jab leg was most highly correlated to test time for the indoor athletes (r= -0.887), however, flexion at maximum flexion of the jab knee was most highly correlated to test time for the outdoor group (r= -0.748).  Outdoor athletes could benefit from assuming a lower and more flexed body position similar to the indoor athletes and attain a greater degree of trunk lean at jab leg touchdown.

A Factor Analysis of Advertising Practitioners' Perceptions of Advertising Ethics

1993 ◽  
Vol 73 (3_suppl) ◽  
pp. 1307-1314 ◽  
Author(s):  
Cornelius B. Pratt ◽  
E. Lincoln James
Keyword(s):  
Factor Analysis ◽  
Regression Analysis ◽  
Social Responsibility ◽  
Principal Components ◽  
Stepwise Multiple Regression ◽  
Stepwise Multiple Regression Analysis ◽  
Advertising Ethics ◽  
Independent Variables ◽  
Forward Stepwise ◽  
Public Responsibility

This research investigated the perceptions of advertising ethics among 460 members of the American Advertising Federation. A principal components factor analysis of members' perceptions, measured by 17 statements, produced four factors of “agencies' standards,” “active public responsibility,” “advertising claims,” and “agencies' social responsibility.” These factors, then used as composite independent variables in a forward stepwise multiple-regression analysis, showed that Factor 3 (“advertising claims”) was the best predictor of the application of deontological (or nonconsequential) ethics to ethically troublesome situations in advertising. Implications of these results for advertising ethics are outlined and suggestions for further research are offered.

Muslim Trade and City Growth Before the Nineteenth Century: Comparative Urbanization in Europe, the Middle East and Central Asia

2019 ◽  
pp. 1-24 ◽  
Author(s):  
Lisa Blaydes ◽  
Christopher Paik
Keyword(s):  
Middle East ◽  
New World ◽  
Turning Point ◽  
Industrial Revolution ◽  
Middle Eastern ◽  
Trade Routes ◽  
Central Asian ◽  
Before And After ◽  
Run Up ◽  
Alternative Routes

AbstractScholars have long sought to understand when and why the Middle East fell behind Europe in its economic development. This article explores the importance of historical Muslim trade in explaining urban growth and decline in the run-up to the Industrial Revolution. The authors examine Eurasian urbanization patterns as a function of distance to Middle Eastern trade routes before and after 1500 CE – the turning point in European breakthroughs in seafaring, trade and exploration. The results suggest that proximity to historical Muslim trade routes was positively associated with urbanization in 1200 but not in 1800. These findings speak to why Middle Eastern and Central Asian cities – which had long benefited from their central location between Europe and Asia – declined as Europeans found alternative routes to the East and opened trade opportunities in the New World.

A Generalized Equation for Prediction of VO2peak from a Step Test

2020 ◽  
Author(s):  
Corey A. Selland ◽  
Joshua Kelly ◽  
Kathleen Gums ◽  
Jessica R. Meendering ◽  
Matt Vukovich
Keyword(s):  
Cross Validation ◽  
Prediction Equation ◽  
Step Test ◽  
Abdominal Circumference ◽  
Stepwise Multiple Regression ◽  
Forward Stepwise ◽  
Test Equation ◽  
New Equation ◽  
Pearson Correlations ◽  
Development Group

AbstractThis study aimed to develop an equation to reduce variability of VO2peak prediction from a step test and compare VO2peak prediction from the new equation to the Queen’s College Step Test (QCST). The development group (n=86; 21.7±2 years) was utilized to develop the SDState step test equation to predict relative VO2peak. The cross-validation group (n=99; 21.6±2 years) was used to determine the validity of the SDState step test VO2peak prediction equation. A regression analysis was used to identify the best model to predict VO2peak. Analysis of variance (ANOVA) was further used to determine differences among predicted and measured VO2peak values. Forward stepwise multiple regression identified age, sex, abdominal circumference, and active heart rate at the 3-min mark of the step test to be significant predictors of VO2peak (mL·kg−1·min−1). No differences among measured VO2peak (47.3±7.1 mL·kg−1·min−1) and predicted VO2peak (QCST, 46.9±9.3 mL·kg−1·min−1; SDState 48.3±5.7 mL·kg−1·min−1) were found. Pearson correlations, ICC, SEE, TEE, Bland-Altman plots, and Mountain plots indicate the SDState step test equation provides less variation in the prediction of VO2peak compared to the QCST. The SDState step test equation is effective for predicting VO2peak from the YMCA step test in young, healthy adults.

Predicting Performance in Army Aviation Flight Training

1992 ◽  
Vol 36 (12) ◽  
pp. 907-910
Author(s):  
Gabriel P. Intano ◽  
William R. Howse
Keyword(s):  
Student Performance ◽  
Flight Training ◽  
Stepwise Multiple Regression ◽  
Multiple Discriminant Analysis ◽  
Development Activity ◽  
Training Performance ◽  
Predicting Performance ◽  
Flight Students ◽  
Forward Stepwise ◽  
Track Test

The Army Research Institute Aviation Research and Development Activity successfully implemented the Multi-Track Test Battery (MTTB) and associated classification functions in 1988. The battery and functions have been used to assign flight students to their combat skills aircraft. The present program determined the applicability of the battery to prediction of student performance in flight training. Performance evaluation in training consists of flight phase grades and academic phase grades. In addition to these grades, Overall Average Grade and Overall Flight Grade were also predicted using Forward Stepwise Multiple Regression procedures. Stepwise Multiple Discriminant Analysis was used to investigate two additional measures, flight deficiency training setback and flight deficiency attrition.

scholarly journals Variables contributing to farmers; attitude towards IPM practices in rice cultivation in Godagari, Rajshahi

1970 ◽  
Vol 5 ◽  
pp. 11-15 ◽  
Author(s):  
M Mostafizur Rahman
Keyword(s):  
Indirect Effects ◽  
Crop Production ◽  
Study Data ◽  
Rice Cultivation ◽  
Farm Size ◽  
Stepwise Multiple Regression ◽  
Direct And Indirect Effects ◽  
Chi Square ◽  
Independent Variables ◽  
Field Schools

To identify the factors contributing to the farmers’ attitude towards Integrated Pest Management (IPM) practices in rice cultivation, 158 family heads of the Farmers Field Schools (FFSs) at Godagari Upzila under Rajshahi District were chosen at random to constitute the subjects of the study. Data were collected from 5 September, 2006 to 28 January, 2007. Twenty four selected characteristics of the farmers were considered as the independent variables while the attitude towards IPM practices in rice cultivation was the only dependent variable. Chi-square tests revealed that all variables except age, family size, farm size, supervision of crop production, annual income and peer relationship differed significantly with the attitude of the farmers. Stepwise multiple regression analysis indicated that aspiration alone contributed more than three-fifths (65.10%) of the total variation, whereas knowledge about pests, predators and risk orientation had also considerable contribution to the attitude towards IPM practices. Results of the path co-efficient analysis showed that aspiration, knowledge about pests and predators, risk orientation, mass extension contact and communication exposure had strong direct and indirect effects on the attitude of the farmers towards IPM practices in rice cultivation in the study area. Key words: Contributing variables; farmers'; attitude; IPM; rice cultivation; Barind. DOI: 10.3329/jles.v5i0.7342 J. Life Earth Sci., Vol. 5: 11-15, 2010

Lung edema increases transvascular filtration rate but not filtration coefficient

1989 ◽  
Vol 66 (4) ◽  
pp. 1553-1560 ◽  
Author(s):  
J. C. Parker ◽  
M. I. Townsley ◽  
J. T. Cartledge
Keyword(s):  
Weight Gain ◽  
Filtration Rate ◽  
Autologous Blood ◽  
Filtration Coefficient ◽  
Lung Edema ◽  
Base Line ◽  
Edema Formation ◽  
Independent Variables ◽  
Highly Correlated ◽  
Severe Pulmonary Edema

To determine whether the accelerated rate of lobe weight gain during severe pulmonary edema is attributed to increased permeability of the microvascular barrier or a loss of tissue forces opposing filtration, the effect of edema on capillary filtration coefficient (Kf,C), interstitial compliance (Ci), and the volume of fluid filtered after a step increase in microvascular pressure (delta Vi) were determined in eight isolated left lower lobes of dog lungs perfused at 37 degrees C with autologous blood. After attaining a base-line isogravimetric state, the capillary pressure (Pc) was increased in successive steps of 2, 5, and 10 cmH2O. This sequence of vascular pressure increases was repeated three times. Edema accumulation was expressed as weight gained as a percent of initial lobe weight (% delta Wt), and Kf,C was measured by time 0 extrapolation of the weight gain curve. An exponential rate constant for the decrease in the rate of weight gain with time (K) was calculated for each curve. Ci was then calculated by assuming that the capillary wall and interstitium constitute a resistance-capacitance network. Kf,C was not increased by edema formation in any group. Between mild (% delta Wt less than 30%) and severe edema states (% delta Wt greater than 50%) respective mean Ci increased significantly from 3.54 to 9.12 ml.cmH2O-1.100 g-1, K decreased from 0.089 to 0.036 min-1, and delta Vi increased from 1.28 to 2.4 ml.cmH2O-1.100 g-1. The delta Vi during each Pc increase was highly correlated with Kf,C and Ci when used together as independent variables (r = 0.99) but less well correlated when used separately.(ABSTRACT TRUNCATED AT 250 WORDS)

Application of multiple regression analysis to morphometric characters obtained from Serranus cabrilla (linnaeus, 1758) by using stepwise method

2017 ◽  
Author(s):  
Levent Sangün ◽  
O. Ýnanç Güney
Keyword(s):  
Body Weight ◽  
Regression Analysis ◽  
Multiple Regression Analysis ◽  
Multiple Regression ◽  
The Body ◽  
Stepwise Multiple Regression ◽  
Morphometric Characters ◽  
Independent Variables ◽  
Fisheries Science ◽  
Stepwise Method

In fisheries science, high number of morphometric measures (independent variables) taken from different parts of the fish complicates the estimation of the body weight (dependent variable). Therefore, the researchers are seeking for a solution facilitating the interpretation of the equations of correlation between the characteristics. One way to deal with this challenge is the dimension reduction by means of stepwise multiple regression analysis. The aim of this study is to explain total variation with the same accuracy by using fewer independent variables. To accomplish this, 12 morphometric measures from 210 individuals of Serranus cabrilla were measured to estimate the body weight. Firstly, the 95% of the variation was explained by means of multiple regression analysis by using all variables. Then, by step-wise method, the same results were achieved with fewer independent variables. Finally, the variables with inter-multicollinearity eliminated and with two remaining independent variables determination coefficients resulted as 95%. The result showed that using more variables does not create significant distinction for accuracy to estimate the body weight although; the total length and body dept was the most effective features for weight.

PREDICTION OF CHANGES IN THE COMPOSITION OF NATURALLY FERMENTED AND CHEMICALLY PRESERVED COLOSTRUM DURING STORAGE

1980 ◽  
Vol 60 (3) ◽  
pp. 763-777
Author(s):  
E. ELIZABETH WHEELER ◽  
S. A. IKURIOR ◽  
J. B. STONE ◽  
I. McMILLAN
Keyword(s):  
Titratable Acidity ◽  
Stepwise Multiple Regression ◽  
Nonprotein Nitrogen ◽  
Total Solids ◽  
Ambient Temperatures ◽  
Effects Of Temperature ◽  
Highly Correlated ◽  
Nutrient Changes ◽  
Temperature Time ◽  
Storage Temperatures

Colostrum was treated with Chemstor (C), formic acid (FA) or a mixture (M) each at the 0.50, 0.75 and 1.00% level (vol/vol) ornaturally fermented (NF) and stored for42 days at each of three ambient temperatures (12, 20 and 28 °C). Analyses of pH, titratable acidity, total solids, protein, nonprotein nitrogen (NPN), lactose and fat were performed initially and at 14-day intervals during storage. Observed data were analyzed by stepwise multiple regression to isolate effects of temperature, time and level of preservative and to predict nutrient changes throughout storage. In NF colostrum, the predicted pH and protein decreased and NPN increased at all storage temperatures. An increase in acidity and decreases in total solids, lactose and fat were predicted over time only in NF colostrum stored at high temperatures. The predicted pH remained constant over temperature and time in FA- and M-treated colostrum and was determined exclusively by the level of preservative applied. M-treatment resulted in lower predicted NPN and higher total solids, protein, lactose and fat during storage than C- or FA-treatment. Fewer nutrient losses were predicted in treated than in NF colostrum. Predicted and observed values were highly correlated.

scholarly journals Determinants of Cumulative GPA of First Year Widyatama University Students

2018 ◽  
Vol 7 (4.34) ◽  
pp. 267
Author(s):  
Farida Nursjanti ◽  
Indra Taruna ◽  
Shinta .
Keyword(s):  
High School ◽  
Stepwise Multiple Regression ◽  
First Year ◽  
Exam Score ◽  
Prospective Students ◽  
First Year Students ◽  
Entrance Exam ◽  
Independent Variables ◽  
Students First ◽  
The University

As a private college-oriented quality, Widyatama University has some quality commitments including receiving potential prospective students and giving priority to customer satisfaction. However, the university only uses entrance exam score, does not use previous academic performance such as national exam score to select potential prospective students. The aims of this research were to examine and to evaluate the factors which affect students’ First Year Cumulative GPA (FYCGPA) in Widyatama University. This research also investigated the determinants of students’ FYCGPA by the factors to explain variances in FYCGPA. This research used gender, major in high school, national exam score and entrance exam score as independent variables. Stepwise multiple regression analysis was carried out in this study. The result indicated that gender, entrance exam score, and major in high school have significant effect to FYCGPA. The model used in this study showed that 24.6% of the variances in FYCGPA can be explained by gender, entrance exam score, and major in high school. This results show that Widyatama University should consider more factors in selecting potential prospective students and providing services to first year students.  

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