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An Empirical Sampling Study Testing The Robustness Of Several Tests For Homogeneity Of Variance
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Book Synopsis An Empirical Sampling Study Testing the Robustness of Several Tests for Homogeneity of Variance by : Henry B. Winkler
Download or read book An Empirical Sampling Study Testing the Robustness of Several Tests for Homogeneity of Variance written by Henry B. Winkler and published by . This book was released on 1968 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Empirical Sampling Study of Several Tests of Homogeneity of Variance by : David A. Probert
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:
Book Synopsis Studies in Research Methodology by : James Vandiver Bradley
Download or read book Studies in Research Methodology written by James Vandiver Bradley and published by . This book was released on 1963 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a natural consequence of the type of task required, the time to operate an instrument control is likely to have a distribution with a distinctive, extremely non-normal shape. The effect of this particular variety of non-normality upon (a) the rapidity of the approach to normality by the distribution of the sample mean as sample size increases, and (b) the approximate validity of certain normality-assuming statistical tests at various sample sizes, was investigated by performing a large sampling study upon a population representing time scores for the operation of a push button.
Book Synopsis Testing Homogeneity of Variance by : Craig S. Wright
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.
Book Synopsis Studies in Research Methodology: The central limit effect for a variety of populations and the robustness of Z, t, and F by : James Vandiver Bradley
Download or read book Studies in Research Methodology: The central limit effect for a variety of populations and the robustness of Z, t, and F written by James Vandiver Bradley and published by . This book was released on 1965 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comparing the Statistical Tests for Homogeneity of Variances by :
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.
Book Synopsis Technical Paper - Army Research Institute for the Behavioral and Social Sciences by :
Download or read book Technical Paper - Army Research Institute for the Behavioral and Social Sciences written by and published by . This book was released on 1978 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Handbook of Statistics by : James L. Bruning
Download or read book Computational Handbook of Statistics written by James L. Bruning and published by Addison-Wesley Longman. This book was released on 1997 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Features a step-by-step approach to statistical analysis. Includes illustrative examples from the behavioral and social sciences - applicable to education as well as a broad range of other fields.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1978 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Book Synopsis Two Extensions of Levene's Test of Homogeneity of Variances by : James Douglas Maas
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:
Book Synopsis Annual review of psychology. 25.1974 by : Mark R. Rosenzweig
Download or read book Annual review of psychology. 25.1974 written by Mark R. Rosenzweig and published by Popular Prakashan. This book was released on 1974 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies in Research Methodology. Vi. the Central Limit Effect for a Variety of Populations and the Robustness of Z, T, and F by :
Download or read book Studies in Research Methodology. Vi. the Central Limit Effect for a Variety of Populations and the Robustness of Z, T, and F written by and published by . This book was released on 1964 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: The robustness of Z, t and F tests was studied by obtaining 1220 empirical sampling distributions (some of which were later combined) each consisting of 10,000 values of the test statistic obtained under a unique combination of sampling conditions. Conditions investigated, both alone and in combination, were: population shapes (nonnormal, normal, or some nonnormal and others normal), population variances (all sigma squared, or some sigma squared and others sigma squared/4), relative sample sizes (for two-sample tests N, N; 2N, N; 3N, N; or 2N,2N; for other multi-sample tests N, N, N; 2N, N, N; or N, N, N, N), and absolute sample size (N assumed values of 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, and in four special cases 2048 and 4096). Robustness at nominal significance levels of .05, .01, and .001 was examined for both left-, right- and two-tail tests. The Central Limit effect upon means of samples from populations differing considerably in shape and 'degree of nonnormality' was revealed in the robustness of certain Z statistics. (Author).
Book Synopsis On the Robustness of Certain Tests for Homogeneity of Variance by : John v. S. Lochhead
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:
Book Synopsis Robustness Tests for Quantitative Research by : Eric Neumayer
Download or read book Robustness Tests for Quantitative Research written by Eric Neumayer and published by Cambridge University Press. This book was released on 2017-08-11 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: The uncertainty that researchers face in specifying their estimation model threatens the validity of their inferences. In regression analyses of observational data, the 'true model' remains unknown, and researchers face a choice between plausible alternative specifications. Robustness testing allows researchers to explore the stability of their main estimates to plausible variations in model specifications. This highly accessible book presents the logic of robustness testing, provides an operational definition of robustness that can be applied in all quantitative research, and introduces readers to diverse types of robustness tests. Focusing on each dimension of model uncertainty in separate chapters, the authors provide a systematic overview of existing tests and develop many new ones. Whether it be uncertainty about the population or sample, measurement, the set of explanatory variables and their functional form, causal or temporal heterogeneity, or effect dynamics or spatial dependence, this book provides guidance and offers tests that researchers from across the social sciences can employ in their own research.
Book Synopsis On Some Transformations in the Analysis of Variance by : Carnegie Institute of Technology. Department of Mathematics
Download or read book On Some Transformations in the Analysis of Variance written by Carnegie Institute of Technology. Department of Mathematics and published by . This book was released on 1962 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Annotated Bibliography on Robustness Studies of Statistical Procedures by : Z. Govindarajulu
Download or read book Annotated Bibliography on Robustness Studies of Statistical Procedures written by Z. Govindarajulu and published by . This book was released on 1972 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synergies of Soft Computing and Statistics for Intelligent Data Analysis by : Rudolf Kruse
Download or read book Synergies of Soft Computing and Statistics for Intelligent Data Analysis written by Rudolf Kruse and published by Springer Science & Business Media. This book was released on 2012-09-07 with total page 555 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years there has been a growing interest to extend classical methods for data analysis. The aim is to allow a more flexible modeling of phenomena such as uncertainty, imprecision or ignorance. Such extensions of classical probability theory and statistics are useful in many real-life situations, since uncertainties in data are not only present in the form of randomness --- various types of incomplete or subjective information have to be handled. About twelve years ago the idea of strengthening the dialogue between the various research communities in the field of data analysis was born and resulted in the International Conference Series on Soft Methods in Probability and Statistics (SMPS). This book gathers contributions presented at the SMPS'2012 held in Konstanz, Germany. Its aim is to present recent results illustrating new trends in intelligent data analysis. It gives a comprehensive overview of current research into the fusion of soft computing methods with probability and statistics. Synergies of both fields might improve intelligent data analysis methods in terms of robustness to noise and applicability to larger datasets, while being able to efficiently obtain understandable solutions of real-world problems.
