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68 articles for “statistical tests”
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Research ArticleOpen accessIn the abstractTHE ADVERSE EFFECT OF STEEL PARTICLE CONTAMINANTS ON FATIGUE LIFE OF GREASE LUBRICATED BALL BEARINGSA. Stathis, Th. Costopoulos, D. Koulocheris, K. RaptisThe rating life of ball bearings is reduced when hard particle contaminants are present in the lubricant. Usually, this life reduction is taken into account in the calculation of modified rating life by using the contamination factor through a general characterization of the lubrication conditions. However, the impact of contaminant’s variables such as size, hardness and concentration level has to … …American Journal of Applied Sciences, Vol. 11, Issue 9 · 14 Jul 2014 · 6,991 accessesView PDFCite
Research ArticleOpen accessIn the abstractFrictional Properties of Self-Ligating Brackets and Low-Friction LigaturesMaria Francesca Sfondrini, Danilo Fraticelli, Federico Rosti et al.Problem statement: To evaluate the frictional forces generated by five different orthodontic brackets when used in combination with stainless steel and NiTi archwires in dry conditions at physiological temperature. Approach: Five different types of maxillary canine brackets (Damon 3 MX, Step, Quick, Sprint, Mini Mono) with a slot size 0.022 inch were coupled with 0.016” and 0.019”×0.025” stainless steel and … …Current Research in Dentistry, Vol. 3, Issue 1 · 9 Mar 2012 · 13,058 accessesView PDFCite
Research ArticleOpen accessIn the abstractPerceptions of Commercialization Activities of Research Results among Academic Researchers in MalaysiaNoorulsadiqin Azbiya Yaacob, Amran Md Rasli, Aslan Amat Senin, Siti Norezam OthmanProblem statement: This study discusses the results of a survey conducted on academic researchers working on biotechnology related research from four leading research universities in Malaysia. The analyses used in this study are essentially exploratory and broadly seeks to address the research question of interest, i.e., to document any differences in opinion between demographic backgrounds group. Approach: Factor analysis and … …American Journal of Economics and Business Administration, Vol. 3, Issue 1 · 7 Jan 2011 · 7,604 accessesView PDFCite
Research ArticleOpen accessIn the abstractDiagnostic Value of Serum and Cerebrospinal Fluid Procalcitonin in Differentiation Bacterial from Aseptic MeningitisZhinous Bayat Makoo, Hamid Reza Soltani, Akbar Hasani et al.Problem statement: Acute bacterial meningitis is one of the most important causes of medical emergency diseases, which can cause high mortality and morbidity rates. Early antibiotic therapy is life saving in bacterial meningitis. One of the most common etiologies of acute meningitis is viral. Differentiation between bacterial and Aseptic meningitis is mandatory, which leads to avoid useless administration of antibiotics. … …American Journal of Infectious Diseases, Vol. 6, Issue 4 · 31 Dec 2010 · 12,078 accessesView PDFCite
Research ArticleOpen accessIn the abstractA Monte Carlo Study of Seven Homogeneity of Variance TestsHoward B. Lee, Gary S. Katz, Alberto F. RestoriProblem statement: The decision by SPSS (now PASW) to use the unmodified Levene test to test homogeneity of variance was questioned. It was compared to six other tests. In total, seven homogeneity of variance tests used in Analysis Of Variance (ANOVA) were compared on robustness and power using Monte Carlo studies. The homogeneity of variance tests were (1) Levene, (2) … …Journal of Mathematics and Statistics, Vol. 6, Issue 3 · 30 Sep 2010 · 8,103 accessesView PDFCite
Research ArticleOpen accessIn the abstractModeling the Distribution of Rainfall Intensity using Hourly DataSalisu Dan'azumi, Supiah Shamsudin, Azmi ArisProblem statement: Design of storm water best management practices to control runoff and water pollution can be achieved if a prior knowledge of the distribution of rainfall characteristics is known. Rainfall intensity, particularly in tropical climate, plays a major role in the design of runoff conveyance and erosion control systems. This study is aimed to explore the statistical distribution of … …American Journal of Environmental Sciences, Vol. 6, Issue 3 · 30 Jun 2010 · 9,001 accessesView PDFCite
Research ArticleOpen accessIn the abstractThe Relationship between Organizational Culture and Staff Productivity Public OrganizationsMehrdad Goudarzvand CheginiProblem statement: Nowadays organization’s culture is as an effective factor on organization actions. The objective of this research is determining of the relationship of organization’s culture with staff productivity in public terms of Guilan province, Iran. Approach: This study was a kind of studies about relations and statistical society will be associated by state organizations staff in Guilan Province. From … …Journal of Social Sciences, Vol. 6, Issue 1 · 31 Mar 2010 · 8,759 accessesView PDFCite
Research ArticleOpen accessIn the abstractStatistical Analysis of the Risk Factors of the Major Epidemic Disease Among Residents of Sekondi-Takoradi Metropolis (STMA)A. J. Turkson, X. J. WangProblem statement: This study focused on statistical analysis of risk factors of the major disease among residents of STMA. The objectives of the study were to find the predominant diseases affecting residents in the catchments area. The study was also meant to identify risk factors associated with the incidence of the predominant disease. Approach: Purposive sampling technique was used to … …Journal of Mathematics and Statistics, Vol. 5, Issue 3 · 30 Sep 2009 · 7,521 accessesView PDFCite
Research ArticleOpen accessIn the abstractA Robust Rescaled Moment Test for Normality in RegressionMd. Sohel Rana, Habshah Midi, A.H.M. Rahmatullah ImonProblem statement: Most of the statistical procedures heavily depend on normality assumption of observations. In regression, we assumed that the random disturbances were normally distributed. Since the disturbances were unobserved, normality tests were done on regression residuals. But it is now evident that normality tests on residuals suffer from superimposed normality and often possess very poor power. Approach: This study … …Journal of Mathematics and Statistics, Vol. 5, Issue 1 · 31 Mar 2009 · 8,260 accessesView PDFCite
Research ArticleOpen accessIn the abstractNonlinear Growth Models for Modeling Oil Palm Yield GrowthAzme Khamis, Zuhaimy Ismail, khalid Haron, Ahmad Tarmizi MohammedThis study provided the basic needs of parameters estimation for nonlinear growth model such as partial derivatives of each model, determination of initial values for each parameter and statistical tests of industrial usage. Twelve nonlinear growth models and its partial derivatives for oil palm yield growth are presented in this study. The parameters are estimated using the Marquardt iterative method … …Journal of Mathematics and Statistics, Vol. 1, Issue 3 · 30 Sep 2005 · 15,101 accessesView PDFCite