scholarly journals Analysis of Variance: The Fundamental Concepts and Application with R

2021 ◽  
Vol 09 (10) ◽  
Author(s):  
Adeniran, A. T. ◽  
Keyword(s):  
Analysis Of Variance ◽  
Statistical Significance ◽  
Data Entry ◽  
P Value ◽  
Control Groups ◽  
R Software ◽  
Treatment Groups ◽  
Anova Model ◽  
Post Hoc ◽  
Mathematical Foundations

The Analysis of Variance (ANOVA) test has long been an essential tool for researchers conducting studies on multiple experimental groups with or without one or more control groups. This article encapsulates the fundamentals of ANOVA for an intended benefit of the reader of scientific literature who does not possess expertise in statistics. The emphasis is on conceptually-based perspectives regarding the use and interpretation of ANOVA results, with minimal coverage of the mathematical foundations. Data entry, checking basic parametric assumptions of ANOVA, descriptive statistics of the data by treatment groups, fitting ANOVA model, statistical significance of the test based on p-value, and post-hoc analysis are all explored using R-software.

scholarly journals Characteristics of anteroposterior curvatures of the spine in soccer and futsal players

2017 ◽  
Vol 18 (4) ◽  
Author(s):  
Krystyna Chromik ◽  
Anna Burdukiewicz ◽  
Jadwiga Pietraszewska ◽  
Aleksandra Stachoń ◽  
Paweł Wolański ◽  
...  
Keyword(s):  
College Students ◽  
Statistical Analysis ◽  
Injury Prevention ◽  
Analysis Of Variance ◽  
Statistical Significance ◽  
Body Posture ◽  
Soccer Players ◽  
Prevention Training ◽  
The Difference ◽  
Post Hoc

AbstractPurpose. The aim of the study was to determine differences in anteroposterior spine curvatures between futsal players, soccer players, and non-training students. The results may contribute to the development of present-day knowledge of posturometry, and its implementation in training can help reduce the risk of body posture disorders in athletes. Methods. The examined group consisted of 48 athletes and 38 non-training college students. Body posture parameters were measured with the use of Posturometr-S. The normality of distribution was checked with the Shapiro-Wilk test, and the differences between the groups were measured with ANOVA and the Bonferroni post-hoc test. The level of statistical significance was set at p < 0.05. Results. The analysis of angle values revealed the widest and most similar measurements in the group of futsal players and soccer players. The analysis of variance proved statistically significant differences between the soccer players and futsal players (p = 0.003). The difference between the soccer players and non-training students was statistically significant. The highest γ angular value was measured in non-training students, followed by futsal players and soccer players. The statistical analysis revealed significant differences between the non-training students and futsal players, as well as non-training students and soccer players (p < 0.001). Conclusions. A complex assessment of athletes’ body posture is crucial in injury prevention. Training overloads may often lead to disorders of the organ of locomotion and affect the correct body posture in athletes. This, in turn, may result in pains and injuries.

scholarly journals Perception on Management of Nursing Education Institutes among Bachelors Students in Selected Nursing Colleges at Kathmandu

2020 ◽  
Vol 7 (1) ◽  
pp. 23-36
Author(s):  
Bhuwan Kumari Dangol ◽  
Narbada Thapa
Keyword(s):  
Nursing Education ◽  
Nursing Students ◽  
Statistical Significance ◽  
Data Entry ◽  
Education Institution ◽  
Cross Sectional Study ◽  
Current Status ◽  
P Value ◽  
Cross Sectional ◽  
Organizational Goals

Management is a process of planning, decision making, organizing, leading, motivating and controlling, and an effective utilization of the resources to reach the organizational goals efficiently and effectively. Management has a crucial role in quality of work and production in any institutions. Although a rapid increase of Nursing Education Institutions in Nepal since last decade which had been trained thousands of nursing cadres, the management aspects of these institutions are not studied adequately. Thus current study intended to explore the current status of Nursing Education Institution Management as experienced and perceived by the bachelors nursing students. A descriptive cross-sectional study was conducted among the nursing institutions in Kathmandu valley. Of the total 28 in the valley, 14 were selected purposively. From the selected institutions, all 377 eligible students currently in final year of study were selected. Among them, 208were from BSN and 169 were from B Sc program.  The data was collected through the self administered structured questioners after taking informed consent. Data entry and analysis was done in SPSS version 16 software. The findings of the study show that 70% students were satisfied in institutional management (mean59.62, SD ± 3.66). In academic management (78%), (mean139.82, SD ± 6.22), followed by human resources 67%, (mean43.54, SD ± 2.79) and were in physical resources management 75% students were satisfied (mean45.02, SD ± 3.08). Analysis of variations between group (administrators, faculties, students) found statistical significance (p value <0.05). So it is concluded the perception of students, faculties and administrator were different on managing the nursing education.

scholarly journals GPS technology to control of external demands of elite Brazilian female football players during competitions (Tecnología GPS para controlar las demandas externas de las jugadoras de fútbol brasileñas de élite durante las competiciones)

Retos ◽  
2020 ◽  
pp. 18-26
Author(s):  
Vitor Ayres Principe ◽  
Ignácio Antônio Seixas-da-Silva ◽  
Rodrigo Gomes de Souza Vale ◽  
Rodolfo De Alkmim Moreira Nunes
Keyword(s):  
Statistical Significance ◽  
Walking Distance ◽  
P Value ◽  
Soccer Teams ◽  
Acceleration Zone ◽  
Playing Time ◽  
Las Mujeres ◽  
Using Data ◽  
Post Hoc ◽  
Women's Soccer

Abstract. This study aimed to determine the external load demands of elite Brazilian soccer players by position and playing time, using data from global positioning technology (GPS) at a data acquisition frequency of 10Hz from a Polar Team Pro. Twenty-three professional players from a top-flight Brazilian women's soccer team participated in the study. The women were 27.65 ± 4.66 years, 165.35 ± 5.82 cm and 60.91 ± 5.34 kg. Data were collected during two competitions disputed simultaneously, the The São Paulo State Championship and the Brazilian Championship A1 series of 2019. Nine variables related to the external locomotor demand performed by the players in the disputed matches were analyzed. The statistical procedures used were the two-way ANOVA with Bonferroni post hoc for data adjustment, and Cohen’s effect size (d), with a p-value < .05 adopted to demonstrate statistical significance. The significant differences in the variables total distance, walking distance, jogging distance, running distance, Sprinting distance, acceleration zone 1, acceleration zone 2, deceleration zone 1 and deceleration zone 2 were analyzed, and the results showed a decrease in the external locomotor demand of the loads during the matches played by these athletes. These results should be used to improve load control and adapt training practices in women's soccer teams.  Resumen. Este estudio tuvo como objetivo determinar el comportamiento de las demandas de carga externa de los jugadores de fútbol brasileños de élite por posición y tiempo de juego, utilizando datos de la tecnología de posicionamiento global (GPS) a una frecuencia de adquisición de datos de 10Hz de un Polar Team Pro. Veintitrés jugadoras profesionales de un equipo de fútbol femenino brasileño de primer nivel participaron en el estudio. Las mujeres tenían 27.65 ± 4.66 años, 165.35 ± 5.82 cm y 60.91 ± 5.34 kg. Los datos fueron recolectados durante dos competencias disputadas simultáneamente, el Campeonato del Estado de São Paulo y el Brasileño de la serie A1 de 2019. Se analizaron nueve variables relacionadas con la demanda externa de locomotoras realizadas por los jugadores en los partidos disputados. Los procedimientos estadísticos utilizados fueron el ANOVA de dos vías con Bonferroni post hoc para el ajuste de datos, y el tamaño del efecto de Cohen (d), con un valor de p < .05 adoptado para demostrar la significación estadística. Se analizaron las diferencias significativas en las variables distancia caminando, distancia de trote, distancia corriendo, distancia de sprint, zona de aceleración 1, zona de aceleración 2, zona de desaceleración 1 y zona de desaceleración 2, y los resultados mostraron una disminución en la demanda locomotora externa de las cargas durante los partidos jugados por estos Atletas. Estos resultados deberían usarse para mejorar el control de carga y adaptar las prácticas de entrenamiento en los equipos de fútbol femenino.

Unusually Small F-Statistic in Analysis of Variance and Regression Analysis

2016 ◽  
Vol 3 (3) ◽  
pp. 45-59
Author(s):  
Ceyhun Ozgur
Keyword(s):  
Regression Analysis ◽  
Lower Limit ◽  
Analysis Of Variance ◽  
Control Chart ◽  
Linear Models ◽  
Statistical Significance ◽  
P Value ◽  
Mean Square ◽  
Process Change ◽  
The Mean

All textbooks and articles dealing with classical tests in the context of linear models stress the implications of a significantly large F-ratio since it indicates that the mean square for whatever effect is being evaluated contains significantly more than just error variation. In general, though, with one minor exception, all texts and articles, to the authors' knowledge, ignore the implications of an F-ratio that is significantly smaller than one would expect due to chance alone. Why this is so difficult to explain since such an occurrence is similar to a range value falling below the lower limit on a control chart for variation or a p-value falling below the lower limit on a control chart for proportion defective. In both of those cases the small value represents an unusual and significant occurrence and, if valid, a process change that indicates an improvement. Therefore, it behooves the quality manager to determine what that change is in order to have it continue. In the case of a significantly small F-ratio some problem may be indicated that requires the designer of the experiment to identify it, and to take “corrective action.” While graphical procedures are available for helping to identify some of the possible problems that are discussed they are somewhat subjective when deciding if one is looking at an actual effect; e.g., interaction, or whether the result is merely due to random variation. A significantly small F-ratio can be used to support conclusions based on the graphical procedures by providing a level of statistical significance as well as serving as a warning flag or warning that problems may exist in the design and/or analysis.

scholarly journals Fluoride release from two types of fluoride-containing orthodontic adhesives: Conventional versus resin-modified glass ionomer cements—An in vitro study

PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0247716
Author(s):  
Yasemin Dziuk ◽  
Sachin Chhatwani ◽  
Stephan C. Möhlhenrich ◽  
Sabrina Tulka ◽  
Ella A. Naumova ◽  
...  
Keyword(s):  
Analysis Of Variance ◽  
Free Water ◽  
P Value ◽  
Orthodontic Appliances ◽  
Fluoride Release ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
Fluoride Ions ◽  
Significant Difference ◽  
Post Hoc

Introduction Development of white spot lesions (WSLs) during orthodontic treatment is a common risk factor. Fixation of the orthodontic appliances with glass ionomer cements could reduce the prevalence of WSL’s due to their fluoride release capacities. The purpose of this study was to evaluate differences of fluoride release properties from resin-modified and conventional glass ionomer cements (GICs). Methods The resin-modified GICs Fuji ORTHO LC (GC Orthodontics), Meron Plus QM (VOCO), as well as the conventional GICs Fuji ORTHO (GC Orthodontics), Meron (VOCO) and Ketac Cem Easymix (3M ESPE) were tested in this study. The different types of GICs were applied to hydroxyapatite discs according to the manufacturer’s instructions and stored in a solution of TISAB III (Total Ionic Strength Adjustment Buffer III) and fluoride-free water at 37°C. Fluoride measurements were made after 5 minutes, 2 hours, 24 hours, 14 days, 28 days, 2 months, 3 months and 6 months. One factor analysis of variance (ANOVA) was used for the overall comparison of the cumulative fluoride release (from measurement times of 5 minutes to 6 months) between the different materials with the overall level of significance set to 0.05. Tukey’s post hoc test was used for post hoc pairwise comparisons in the cumulative fluoride release between the different materials. Results The cumulative fluoride release (mean ± sd) in descending order was: Fuji ORTHO LC (221.7 ± 10.29 ppm), Fuji ORTHO (191.5 ± 15.03 ppm), Meron Plus QM (173.0 ± 5.89 ppm), Meron (161.3 ± 7.84 ppm) and Ketac Cem Easymix (154.6 ± 6.09 ppm) within 6 months. Analysis of variance detected a significant difference in the cumulative fluoride release between at least two of the materials (rounded p-value < 0.001). Pairwise analysis with Tukey’s post hoc test showed a significant difference in the cumulative fluoride release for all the comparisons except M and MPQM (p = 0.061) and KCE and M (p = 0.517). Conclusion Fluoride ions were released cumulatively over the entire test period for all products. When comparing the two products from the same company (Fuji ORTHO LC vs. Fuji ORTHO from GC Orthodontics Europe GmbH and Meron Plus QM vs. Meron from VOCO GmbH, Mannheim, Germany), it can be said that the resin-modified GICs have a higher release than conventional GICs. The highest individual fluoride release of all GICs was at 24 hours. A general statement, whether resin-modified or conventional GICs have a higher release of fluoride cannot be made.

A More Powerful Post Hoc Multiple Comparison Procedure in Analysis of Variance

1998 ◽  
Vol 23 (3) ◽  
pp. 279-289 ◽  
Author(s):  
Alan J. Klockars ◽  
Gregory R. Hancock
Keyword(s):  
Analysis Of Variance ◽  
Infinite Number ◽  
Critical Values ◽  
Multiple Comparison ◽  
Treatment Groups ◽  
Small Set ◽  
F Distribution ◽  
Multiple Comparison Procedure ◽  
Post Hoc

Scheffé’s test ( Scheffé, 1953 ), which is commonly used to conduct post hoc contrasts among k group means, is unnecessarily conservative because it guards against an infinite number of potential post hoc contrasts when only a small set would ever be of interest to a researcher. This paper identifies a set of post hoc contrasts based on subsets of the treatment groups and simulates critical values from the appropriate multivariate F-distribution to be used in place of those associated with Scheffé’s test. The proposed method and its critical values provide a uniformly more powerful post hoc procedure.

scholarly journals PERSALINAN NYAMAN DENGAN TEKNIK REBOZO

2021 ◽  
Vol 12 (2) ◽  
pp. 287
Author(s):  
Putri Yuriati ◽  
Etika Khoiriyah
Keyword(s):  
Treatment Group ◽  
Pain Relief ◽  
Labor Pain ◽  
P Value ◽  
Group Comparison ◽  
Control Groups ◽  
Treatment Groups ◽  
Positive Effects ◽  
Coated Membranes ◽  
Long Time

Persalinan adalah proses dimana bayi, plasenta dan selaput ketuban keluar dari rahim ibu pada usia cukup bulan tanpa disertai penyulit. Pada proses persalinan kemampuan dan keterampilan penolong sangat mempengaruhi kenyamanan dan kelancaran persalinan. Asuhan yang diberikan dapat disesuaikan dengan kondisi ibu. Teknik rebozo dapat digunakan selama persalinan untuk membantu serat otot dalam ligament uterus rileks sehingga mampu mengurangi rasa sakit serta dapat menciptakan efek positif psikologis dan sosial, sehingga ibu yang melahirkan dalam keadaan rileks, semua lapisan otot dalam rahim akan bekerja sama secara harmonis sehingga persalinan berjalan lancar, mudah, dan nyaman. Penelitian ini bertujuan untuk mengetahui pengaruh tekhnik rebozo dengan lamanya kalai 1 dan tingkat nyeri pada proses persalinan. Desain penelitian ini menggunakan Pra Eksperiment dengan pendekatan satisfic group comparison desain untuk mengetahui pengaruh tekhnik rebozo terhadap pengurangan rasa nyeri dan lamanya kala I pada kelompok perlakuan dan untuk mengetahui tingkat nyeri dan lamanya kala I pada kelompok kontrol. Hasil analisa lama kala I dengan menggunakan teknik rebozo pada kelompok perlakuan sebesar1,20 dimana p-value 0,002. Sedangkan analisa tingkat nyeri sebesar 1,20 dengan p-value 0,000. Ada pengaruh dilakukan teknik rebozo dengan lamanya kala I dan tingkat nyeri pada proses persalinan. Teknik rebozo dapat diterapkan pada setiap proses persalinan normal. Kata kunci : Teknik Rebozo, Lama Kala I, Nyeri Persalinan  AbstractChildbirth is a process by which babies, placenta and amni-coated membranes emerge from the mother's womb at enough age without an embroiderer. In the delivery of helper skills and skills greatly affect the comfort and smoothness of delivery. The upbringing given can be tailored to the mother's condition. The rebozo technique can be used during labor to help the muscle fibers in the ligament of the uterus relax so that it helps to reduce pain and can create psychological and social positive effects, so that the relaxed birth of the mother works harmonically and thus function smoothly, easily, and comfortably. The study aims to identify the effects of rebozo's technique with length of time 1 and the level of pain in childbirth. This research design USES pre experiment with the satisfic group submission design to know the rebozo's impact on pain relief and length of time on treatment groups and to know the degree of pain and length of time on control groups. Ancient analysis of time I used a rebozo technique on a huge treatment group 1.20 where p-value 0.002. While the analysis of pain levels is 1.20 with p-value 0,000. Rebozo techniques have been affected by the length of time and the degree of pain in childbirth. Rebozo techniques can be applied to any normal childbirth process. Keywords: Rebozo Technique, Long Time I, Labor Pain

scholarly journals Evaluation of Attitude Towards Collaboration in Physicians and Nurses: A Cross-Sectional Research

2020 ◽  
Author(s):  
Pınar Erarslan ◽  
Yıldırm Beyazıt Gülhan
Keyword(s):  
Significant Relationship ◽  
Statistical Significance ◽  
Health Service Delivery ◽  
Demographic Variables ◽  
P Value ◽  
Cross Sectional ◽  
Anova Test ◽  
Homogeneous Universe ◽  
Post Hoc ◽  
Voluntary Basis

INTRODUCTION: In this study, it was aimed to investigate the attitudes of physicians and nurses working in a aducational and research hospital towards collaboration according to socio-demographic variables. METHODS: This study was conducted in a aducational andr esearch hospital between April-May 2018. 1292 physicians and nurses constituted the universe and the sample size was 297 for this non-homogeneous universe. The questionnaires prepared in accordance with the aim of the study were completed by physicians and nurses on a voluntary basis. ‘Jefferson Scale of Attitudes Toward Physician-Nurse Collaboration’ was used to evaluate the collaboration score. For statistical analysis, t-test, One-way Anova test, and after the Anova test, Scheffe was used as complementary post-hoc analysis to determine the differences. The p value of <0.05 was accepted for statistical significance. RESULTS: According to the occupational variable, nurses have a more positive attitude and are more prone to collaboration than physicians. There was a statistically significant relationship between the variables of profession, gender, age, education level and nursing study area. There was no statistically significant relationship between demographic characteristics such as physician study area, experience and visit status (p>0,05). DISCUSSION AND CONCLUSION: It was concluded that the implementation of joint vocational training programs that will strengthen the collaboration attitude and the creation of an atmosphere of Professional respect will provide positive results in health service delivery.

scholarly journals Statistical Analysis of Leading Goal Scoring Pattern of Europe’s Top Five Football Leagues

2020 ◽  
Vol 9 (4) ◽  
pp. 517-521
Keyword(s):  
Statistical Analysis ◽  
Analysis Of Variance ◽  
P Value ◽  
Microsoft Excel ◽  
Post Hoc Analysis ◽  
Premier League ◽  
European Football ◽  
Post Hoc ◽  
The Relationship ◽  
Frequency Counts

Previous researchers have discussed goal-scoring patterns of different football leagues, but little has been done on leading or top goal scorer. In this study, the focus is on the relationship between leading goal scoring and final league position for the top five European leagues (Premier League, La Liga, Serie A, Bundesliga and Ligue 1). The five leagues are the current top leagues in Europe as ranked by the Union of European Football Association (UEFA). The data were obtained from the respective leagues’ football association websites. The data were entered into Microsoft Excel spreadsheet to create frequency counts. Thereafter correlation and analysis of variance (ANOVA) was done using Minitab 18.0 and SPSS version 23. From the result, it was observed that there is a significant relationship between leading goal scoring and league positions for La Liga at a p value equals 0.013 and Germany at a p value equals 0.042, but no relationship for the remaining three leagues. Choosing the last 20 seasons only, the analysis of variance (ANOVA) revealed that the final league positions of the clubs that produced the leading goal scorers are the same across the leagues at p value = 0.349. However, the opposite is the case of the goal-scoring pattern and p value < 0.005 were obtained. Further investigation using the Post Hoc analysis revealed that the goal-scoring pattern of leading goal scores in Spanish La Liga is significantly different from others.

Testing the Effectiveness of Alternative Foot-in-the-Door Manipulations

1980 ◽  
Vol 17 (3) ◽  
pp. 359-364 ◽  
Author(s):  
Robert A. Hansen ◽  
Larry M. Robinson
Keyword(s):  
Response Times ◽  
Short Form ◽  
Statistical Significance ◽  
Response Rates ◽  
Future Research ◽  
Business Research ◽  
Control Groups ◽  
Treatment Groups ◽  
Managerial Implications ◽  
Single Contact

Recently the foot-in-the-door principle was applied in a typical business research setting by Reingen and Kernan. Results of this single-contact or nondelay foot application were mixed; compliance rates for the foot treatment groups lacked statistical significance when compared with those of appropriate control groups. A field experiment undertaken to explain these results yields evidence that the specific nature of the foot manipulation in part determines its effectiveness. The study compares the effectiveness of high and low involvement foot manipulations in generating compliance with both short and long forms of a mail questionnaire. The high and the low involvement foot manipulations generate significantly higher response rates and faster response times than a noncontact control situation. In addition, the short form questionnaires generate a higher return rate. High involvement foot treatments generate higher response rates than low involvement foot treatments. Managerial implications of the results and suggestions for future research are presented.

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