Research ArticleOpen accessEvery word in the titlePERFORMANCE OF RIDGE REGRESSION ESTIMATOR METHODS ON SMALL SAMPLE SIZE BY VARYING CORRELATION COEFFICIENTS: A SIMULATION STUDYAnwar Fitrianto, Lee Ceng YikWhen independent variables have high linear correlation in a multiple linear regression model, we can have wrong analysis. It happens if we do the multiple linear regression analysis based on common Ordinary Least Squares (OLS) method. In this situation, we are suggested to use ridge regression estimator. We conduct some simulation study to compare the performance of ridge regression estimator … …Journal of Mathematics and Statistics, Vol. 10, Issue 1 · 3 Jan 2014 · 8,540 accessesView PDFCite
Research ArticleOpen accessIn the keywordsDesign Based on Intra-Class Correlation CoefficientsRobert Lew, Gheorghe DorosProblem statement: Reliability studies are concerned with the study of "consistency" or "repeatability" of measurements. Often times (but not always) the reliability coefficients are Intra-class Correlation Coefficients (ICC). Depending on the design or the conceptual intent of the study there are three types of intra-class correlation coefficients, termed intra-class correlation coefficients Case 1, 2 and 3, for measuring the reliability … …Current Research in Biostatistics, Vol. 1, Issue 1 · 30 Jun 2010 · 18,541 accessesView PDFCite
Research ArticleOpen accessIn the keywordsProduct Moments of Sample Variances and Correlation for Variables with Bivariate Normal DistributionJuan Romero-PadillaA general result to obtain the product moments of two sample variances and the sample correlation when the data follow a bivariate normal distribution is derived; the result is expressed in terms of the hypergeometric function. As corollaries, two general equations are stated, one to obtain the moments of the correlation sample and one to obtain the moments of the … …Journal of Mathematics and Statistics, Vol. 12, Issue 1 · 15 Mar 2016 · 7,282 accessesView PDFCite
Research ArticleOpen accessIn the abstractSialoliths: A Radiographic Retrospective StudyGeorges Aoun, Abbass El-Outa, Ibrahim Nasseh: Sialoliths are salivary gland calcifications that mainly affect submandibular and parotid glands. They are detected incidentally on dental panoramic radiographs. This study aimed to determine the prevalence of sialoliths in a Lebanese sample and evaluate the site, gender and age distribution of such findings. In this retrospective study, 500 digital panoramic radiographs, belonging to 219 males and 281 females … …Current Research in Dentistry, Vol. 11, Issue 1 · 7 Feb 2021 · 6,542 accessesView PDFCite
Research ArticleOpen accessIn the abstractOn Concomitants of Ordered Ranked Set Sampling from Morgenstern FamilyMohammed S. KotbThis paper develops the distribution theory of concomitants in the context of ordered ranked set sample from the Farlie-Gumbel-Morgenstern bivariate family. Here, we derive the joint distribution of concomitants of two ordered ranked set sample and obtain their single and product moments alongside the correlation coefficient. Finally, an application of the results in establishing the moments and the variance-covariance for … …Journal of Mathematics and Statistics, Vol. 13, Issue 4 · 27 Dec 2017 · 6,965 accessesView PDFCite
Research ArticleOpen accessIn the abstractFAVORED ZODIAC FOR CELEBRITY BIRTHSMiah M. Adel, Saiyeeda F. Hossain, Hannah JohnsonTo find any favored zodiac sign for celebrity births, a sample of 100 celebrities were randomly selected from people of different walks of life. The sample contained politicians, natural scientists, social scientists, Authors of literary works, social workers, humanitarian workers, business personnel, sports icons, singers, actors, actresses, etc. etc. from history and from the current time. The zodiac signs for … …Journal of Social Sciences, Vol. 9, Issue 4 · 13 Feb 2014 · 54,618 accessesView PDFCite
Research ArticleOpen accessIn the abstractAssociation of Escherichia coli with the Prevalence of Flies PopulationHassan Flayiah Hassan, Marryam AlkafagiMass releases of house fly Musca domestica (L) and stable fly Stomoxys calcitrans (L). Produced by manure piles accumulated nearby horse stables and dairy farm village in Abu-Graib provide continuous threat to inhabitants west of Baghdad. Timing of fly’s mass release in association with the presence of Escherichia coli in manure piles was examined at these locations. Experimental result indicated … …American Journal of Agricultural and Biological Sciences, Vol. 8, Issue 3 · 11 Sep 2013 · 7,200 accessesView PDFCite
Research ArticleOpen accessIn the abstractA Measure of Monotonicity of two Random VariablesFarida Kachapova, Ilias KachapovProblem statement: When analyzing random variables it was useful to measure the degree of their monotone dependence or compare pairs of random variables with respect to their monotonicity. Existing coefficients measure general or linear dependence of random variables. Developing a measure of monotonicity was useful for practical applications as well as for general theory, since monotonicity was an important type … …Journal of Mathematics and Statistics, Vol. 8, Issue 2 · 26 May 2012 · 8,692 accessesView PDFCite
Research ArticleOpen accessIn the abstractSome Effects of Alternative Foreign Currency Translation Methodologies on two Short-Term Liquidity RatiosPaul E. HoltThis study focused on two short-term liquidity ratios, the current ratio and inventory turnover and attempted to identify, in terms of empirical properties, if and in what ways foreign currency translation methodologies generate different results. Fifty companies’ accounts were translated from U.S. dollars to U.K. pounds. Post-translation Spearman rank correlation coefficients were extremely high for all methodology pairs, but t … …American Journal of Economics and Business Administration, Vol. 3, Issue 4 · 8 Mar 2012 · 7,484 accessesView PDFCite