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Author : Charles Randall Michel
Publisher :
ISBN 13 :
Total Pages : 98 pages
Book Rating : 4.:/5 (261 download)
Download or read book Preliminary Tests for Homogeneity of Variance written by Charles Randall Michel and published by . This book was released on 1972 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Isaiah Hertzberg
Publisher :
ISBN 13 :
Total Pages : 47 pages
Book Rating : 4.:/5 (561 download)
Download or read book Some Tests for Homogeneity in the Analysis of Variance written by Isaiah Hertzberg and published by . This book was released on 1953 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John v. S. Lochhead
Publisher :
ISBN 13 :
Total Pages : 272 pages
Book Rating : 4.:/5 (269 download)
Download or read book On the Robustness of Certain Tests for Homogeneity of Variance written by John v. S. Lochhead and published by . This book was released on 1973 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Arthur Louis Durand
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (51 download)
Download or read book Comparative Power of Various Tests of Homogeneity of Variance written by Arthur Louis Durand and published by . This book was released on 1969 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John Milo Myers
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (192 download)
Download or read book Study of Tests for Homogeneity of Variances written by John Milo Myers and published by . This book was released on 1988 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Christophe Lalanne
Publisher : Elsevier
ISBN 13 : 0081011717
Total Pages : 176 pages
Book Rating : 4.0/5 (81 download)
Download or read book Biostatistics and Computer-based Analysis of Health Data Using SAS written by Christophe Lalanne and published by Elsevier. This book was released on 2017-06-22 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume of the Biostatistics and Health Sciences Set focuses on statistics applied to clinical research.The use of SAS for data management and statistical modeling is illustrated using various examples. Many aspects of data processing and statistical analysis of cross-sectional and experimental medical data are covered, including regression models commonly found in medical statistics. This practical book is primarily intended for health researchers with a basic knowledge of statistical methodology. Assuming basic concepts, the authors focus on the practice of biostatistical methods essential to clinical research, epidemiology and analysis of biomedical data (including comparison of two groups, analysis of categorical data, ANOVA, linear and logistic regression, and survival analysis). The use of examples from clinical trials and epidemiological studies provide the basis for a series of practical exercises, which provide instruction and familiarize the reader with essential SAS commands. - Presents the use of SAS software in the statistical approach for the management of data modeling - Includes elements of the language and descriptive statistics - Supplies measures of association, comparison of means, and proportions for two or more samples - Explores linear and logistic regression - Provides survival data analysis
Download or read book Comparing the Statistical Tests for Homogeneity of Variances written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Testing the homogeneity of variances is an important problem in many applications since statistical methods of frequent use, such as ANOVA, assume equal variances for two or more groups of data. However, testing the equality of variances is a difficult problem due to the fact that many of the tests are not robust against non-normality. It is known that the kurtosis of the distribution of the source data can affect the performance of the tests for variance. We review the classical tests and their latest, more robust modifications, some other tests that have recently appeared in the literature, and use bootstrap and permutation techniques to test for equal variances. We compare the performance of these tests under different types of distributions, sample sizes and true ratios of variances of the populations. Monte-Carlo methods are used in this study to calculate empirical powers and type I errors under different settings.
Author : Craig S. Wright
Publisher :
ISBN 13 :
Total Pages : 89 pages
Book Rating : 4.:/5 (13 download)
Download or read book Testing Homogeneity of Variance written by Craig S. Wright and published by . This book was released on 2017 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper compares empirical type I error and power of different tests that have been proposed to assess the homogeneity of within-group variances. The main questions answered in the paper are:(1) Which tests are most effective (powerful and robust) when testing the homogeneity of variances in various conditions of heterogeneity, and(2) When these conditions exist, do any of the tests of homogeneity of variance prove more effective in the detection of heterogeneity than others?An introductory simulation study established that Anova is extremely susceptible to heterogeneity of the variances. This occurs both in normally distributed and non-normal datasets. Even small deviances from homogeneity to that of heteroscedasticity results in inflated type I error.A subsequent simulation study was conducted. The purpose of this study was to determine which of the tests of homogeneity of variances preformed best in unfavourable conditions. These conditions included small sample sizes and a number of non-normal distributions. In these conditions, Bartlett's or Box's tests perform well. Conversely, Cochran's test and the Log Anova test exhibited low power with small to moderate sample sizes even with normally distributed datasets. A decision tree has been created for these results that can be used to determine the most effective test strategy.
Author : ROBERT R. SOKAL
Publisher : Dover Publications
ISBN 13 : 9780486788746
Total Pages : 384 pages
Book Rating : 4.7/5 (887 download)
Download or read book Introduction to Biostatistics written by ROBERT R. SOKAL and published by Dover Publications. This book was released on 2013-12-20 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Suitable for undergraduates with a minimal background in mathematics, this introduction ranges from descriptive statistics to fundamental distributions and the testing of hypotheses. Includes numerous worked-out problems and examples. 1987 edition.
Author : Thomas Baguley
Publisher : Bloomsbury Publishing
ISBN 13 : 0230363555
Total Pages : 864 pages
Book Rating : 4.2/5 (33 download)
Download or read book Serious Stat written by Thomas Baguley and published by Bloomsbury Publishing. This book was released on 2018-01-24 with total page 864 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ideal for experienced students and researchers in the social sciences who wish to refresh or extend their understanding of statistics, and to apply advanced statistical procedures using SPSS or R. Key theory is reviewed and illustrated with examples of how to apply these concepts using real data.
Author : Judith Anne Giles
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (318 download)
Download or read book Estimation of the Error Variance After a Preliminary-test of Homogeneity in a Regression Model with Spherically Symmetric Disturbances written by Judith Anne Giles and published by . This book was released on 1990 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David A. Probert
Publisher :
ISBN 13 :
Total Pages : 160 pages
Book Rating : 4.:/5 (314 download)
Download or read book An Empirical Sampling Study of Several Tests of Homogeneity of Variance written by David A. Probert and published by . This book was released on 1969 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Daniel Navarro
Publisher : Lulu.com
ISBN 13 : 1326189727
Total Pages : 617 pages
Book Rating : 4.3/5 (261 download)
Download or read book Learning Statistics with R written by Daniel Navarro and published by Lulu.com. This book was released on 2013-01-13 with total page 617 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Learning Statistics with R" covers the contents of an introductory statistics class, as typically taught to undergraduate psychology students, focusing on the use of the R statistical software and adopting a light, conversational style throughout. The book discusses how to get started in R, and gives an introduction to data manipulation and writing scripts. From a statistical perspective, the book discusses descriptive statistics and graphing first, followed by chapters on probability theory, sampling and estimation, and null hypothesis testing. After introducing the theory, the book covers the analysis of contingency tables, t-tests, ANOVAs and regression. Bayesian statistics are covered at the end of the book. For more information (and the opportunity to check the book out before you buy!) visit http://ua.edu.au/ccs/teaching/lsr or http://learningstatisticswithr.com
Author : Juan Manuel Romero Padilla
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (896 download)
Download or read book Estimation of Variance in Bivariate Normal Distribution After Preliminary Test of Homogeneity written by Juan Manuel Romero Padilla and published by . This book was released on 2014 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: A preliminary test estimator of variance in the bivariate normal distribution is proposed after Pitman-Morgan test of homogeneity of two variances. We propose one estimator of variance after preliminary test of two tails and another one for one tail test. The biases and mean square errors of both estimators are derived. The relative efficiency (RE) of the preliminary test estimator is studied. Computations and 3D graphs of RE for different parameters are analyzed. In order to get the maximum RE, recommendations of the significance level for the preliminary test are given for various sample sizes by using the max-min criterion.
Author : Stanford University. Department of Statistics
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (123 download)
Download or read book Unbiasedness of Tests for Homogeniety of Variances written by Stanford University. Department of Statistics and published by . This book was released on 1970 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James Douglas Maas
Publisher :
ISBN 13 :
Total Pages : 244 pages
Book Rating : 4.3/5 (129 download)
Download or read book Two Extensions of Levene's Test of Homogeneity of Variances written by James Douglas Maas and published by . This book was released on 1975 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M. L. Puri
Publisher : Palala Press
ISBN 13 : 9781378112724
Total Pages : 44 pages
Book Rating : 4.1/5 (127 download)
Download or read book On Some Tests of Homogeneity of Variances written by M. L. Puri and published by Palala Press. This book was released on 2018-02-19 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
