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A Note on Variance Heterogeneity in the Analysis of Variance
Psychological Reports, 1964This article reviews and summarizes the empirical sampling studies of the effects of variance heterogeneity in the analysis of variance. The general conclusion of these studies, that heterogeneity of variance is not an occurrence of importance, is only demonstrated for the simple randomized design; it remains to be demonstrated for the more complex ...
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Defect Heterogeneity in Monolayer WS2 Unveiled by Work Function Variance
Chemistry of Materials, 2019Defects are commonly found in two-dimensional (2D) transition-metal dichalcogenide (TMD) materials. Such defects usually dictate the optical and electrical properties of TMDs.
Xinyun Wang +10 more
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The degree variance: An index of graph heterogeneity
Social Networks, 1981Abstract In the analysis of empirically found graphs, the variance of the degrees can be used as a measure for the heterogeneity of (the points in) the graph. For several types of graphs, the maximum value of the degree variance is given, and the mean and variance of the degree variance under a simple stochastic null model are computed.
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Journal of Educational and Behavioral Statistics, 1998
Bayesian analysis of hierarchically structured data with random intercept and heterogeneous within-group (Level-1) variance is presented. Inferences about all parameters, including the Level-1 variance and intercept for each group, are based on their marginal posterior distributions approximated via the Gibbs sampler Analysis of artificial data with ...
Rafa M. Kasim, Stephen W. Raudenbush
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Bayesian analysis of hierarchically structured data with random intercept and heterogeneous within-group (Level-1) variance is presented. Inferences about all parameters, including the Level-1 variance and intercept for each group, are based on their marginal posterior distributions approximated via the Gibbs sampler Analysis of artificial data with ...
Rafa M. Kasim, Stephen W. Raudenbush
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Genetic heterogeneity of variance in production traits of laying hens
British Poultry Science, 2011Genetic parameters for mean and for environmental variation in egg weight, body weight, age at first egg, and egg production were estimated in eight layer lines. The data were recorded from years 1999-2007, with on average of 6500 birds per line. An iterative mean-variance REML method was applied with a sire-plus-dam model for mean, a sire model for ...
A, Wolc +3 more
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Heterogeneous filtering of ensemble‐based background‐error variances
Quarterly Journal of the Royal Meteorological Society, 2012AbstractBackground‐error variances estimated from a finite size ensemble of data assimilations are affected by sampling noise, which degrades the accuracy of the variance estimates. Previous work highlighted the close link between the spatial structures of background error and the associated sampling noise, and demonstrated the ability of local spatial
Laure Raynaud, Olivier Pannekoucke
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Robustness of Multiple Comparisons Against Variance Heterogeneity
1984If H0:μ1 = … = μk is rejected for normal populations with classical one way analysis of variance, it is usually of interest to know where the differences may be. If the population variances are equal there are several approaches one might consider: 1. Least Significant Difference test (Fisher, 1935) 2.
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Comparison of multiplicative heterogeneous variance adjustment models for genetic evaluations
Journal of Animal Breeding and Genetics, 2014SummaryTwo heterogeneous variance adjustment methods and two variance models were compared in a simulation study. The method used for heterogeneous variance adjustment in the Nordic test‐day model, which is a multiplicative method based on Meuwissen (J.
Márkus, Sz. +4 more
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Distribution of variance ratio in unbalanced random model under heterogeneity of error variances
Communications in Statistics - Theory and Methods, 1991The effects of heteroscedasticity have been studied on the mean and variance of F ratio and on the power of F-test in unbalanced one-way random model, numerically. The computed results reveal that the heteroscedasticity and unbalanoedness have combined effects.
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