Variance Components
نویسنده
چکیده
منابع مشابه
Investigation of Variance Components in the Medical Expenditure Panel Survey
Statistical methodology has been developed to decompose total variance into sources of variation. These sources of variation are usually referred to as components of variance. There are different reasons for attempting to produce variance components. In models decomposing the variance is often done in order to increase the accuracy of the model. In the finite population setting, variance is usu...
متن کاملEstimation of Variance Components for Body Weight of Moghani Sheep Using B-Spline Random Regression Models
The aim of the present study was the estimation of (co) variance components and genetic parameters for body weight of Moghani sheep, using random regression models based on B-Splines functions. The data set included 9165 body weight records from 60 to 360 days of age from 2811 Moghani sheep, collected between 1994 to 2013 from Jafar-Abad Animal Research and Breeding Institute, Ardabil province,...
متن کاملComparing the Structural Components Variance Estimator and U-Statistics Variance Estimator When Assessing the Difference Between Correlated AUCs with Finite Samples
COMPARING THE STRUCTURAL COMPONENTS VARIANCE ESTIMATOR AND USTATISTICS VARIANCE ESTIMATOR WHEN ASSESSING THE DIFERENCE BETWEEN CORRELATED AUCs WITH FINITE SAMPLES By Anna Leigh Bosse, M.S. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science at Virginia Commonwealth University. Virginia Commonwealth University, 2017 Major Director: Dr. Le Kang, Assoc...
متن کاملComparison of Designs for the Three-Fold Nested Random Model
The quality of estimation of variance components depends on the design used as well as on the unknown values of the variance components. In this article, three designs are compared, namely, the balanced, staggered, and inverted nested designs for the three-fold nested random model. The comparison is based on the so-called quantile dispersion graphs, introduced in Khuri (1997), using analysis of...
متن کاملEvolution of Phenotypic Variance.
A cornerstone of evolutionary theory is that the phenotypic variance of a population may be partitioned into genetic and environmental (nonheritable) components. The traditional motivation for this distinction is that the rate of evolution under natural selection depends on the (relative) magnitudes of certain genetic components of variance. The components of variation are also interesting from...
متن کاملAre variance components of exposure heterogeneous between time periods and factories in the European carbon black industry?
Occupational exposure to chemical agents can vary enormously within- and between-workers, even when carrying out the same jobs. When repeated measurements are available, the variance components can be estimated using random- or mixed-effects models. Pooling the variance components across the fixed effects, in mixed-effects models, reduces the complexity of the models; especially, when there are...
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