Results 221 to 230 of about 233,443 (255)

Computing Iterative Weighted Least Squares Estimates of Genetic Variance Components

Biometrics, 1977
In genetic experiments in which variance components are to be estimated from correlated mean squares and mean products, the direct computation of iterative weighted least squares estimates is computationally expensive. An algorithm has been developed which finds and applies linear transformations to the input matrices of mean squares and mean products ...
Cornelius, P. L., Byars, J.
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Genetic and environmental variance components in guava fruit qualities

Scientia Horticulturae, 2005
Abstract The proportion of genetic and environmental variances for fruit weight (FW), flesh thickness (FLT), flesh weight (FLW), fruit firmness (FF), seed cavity weight (SCW), total soluble solids (TSS), titratable acidity (TA), juice acidity (pH), and ascorbic acid (AA) in guava were estimated with eight genotypes, four trees per genotype, and five ...
K. Thaipong, U. Boonprakob
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Assessing genetic linkage and association with robust components of variance approaches

Annals of Human Genetics, 1996
SummarySimulation studies are used to explore the properties of procedures for estimating components of variance and constructing test statistics in genetic linkage studies of quantitative traits. We evaluated the bias and median squared error of estimates of the linked additive genetic variance obtained by regression, maximum likelihood and ...
C I, Amos, D K, Zhu, E, Boerwinkle
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Estimates of variance components for genetic correlations among swine estrus traits

Journal of Animal Science, 2010
Variance components and genetic correlations were estimated among estrus, puberty, growth, and composition traits in Landrace-Large White gilts (n = 1,225; Genetic Improvement Services, Newton Grove, NC) from 59 sires and 330 dams. Four groups of gilts entered the North Carolina Swine Evaluation Station in Clayton at an average age of 162 d and were ...
M T, Knauer, J P, Cassady, D W, Newcom, M T, See   +3 more
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Variance Components with Reference to Genetic Population Parameters

Biometrics, 1955
The inature of variability in a populationi observed at a giveni time wTith respect to a particular metric trait is of great interest and importance among animal and plant breeders. Their work depends heavily upon the ability to design breeding experiments and to take advantage of statistical techniques which will enable them successfully to apportion ...
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Components of the genetic variance and genetic correlations between traits in Mango

Scientia Horticulturae, 1998
Phenotypic and genetic variance components for mango (Mangifera indica) traits were estimated. The analyzed population composed of 745 progeny derived from both controlled crosses and open pollination. The average percent of selfing was estimated from the statistical model to be 50%.
U Lavi, E Tomer, S Gazit, J Hillel
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On the Probabilities of Obtaining Negative Estimates of Genetic Variance Components

Biometrical Journal, 1978
AbstractThis paper derives the probabilities of obtaining negative estimates of additive and dominance genetic variances when one uses the traditional weighted least square method for estimating genetic variances as given in MATHER and JINKS (1971). The model considered involves P1, P2, F2, B1 (Backcross to P1) and B2 (Backcross to P2). The results are
Tan, W. Y., Wong, S. P.
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Variance‐components tests for genetic association with multiple interval‐censored outcomes

Statistics in Medicine
Massive genetic compendiums such as the UK Biobank have become an invaluable resource for identifying genetic variants that are associated with complex diseases. Due to the difficulties of massive data collection, a common practice of these compendiums is to collect interval‐censored data. One challenge in analyzing such data is the lack of methodology
Jaihee Choi, Zhichao Xu, Ryan Sun
openaire   +3 more sources

Genetic and environmental components of the population variance in bone density

Osteoporosis International, 1997
Understanding of the genetic and environmental factors contributing to the differences in fracture rates between young and old, between women and men, and between races is limited. The reasons for this may partly relate to the lack of a detailed understanding of the structural basis of bone fragility.
E, Seeman, J L, Hopper
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Mechanistic models for additive manufacturing of metallic components

Progress in Materials Science, 2021
Tuhin Mukherjee, Wei Zhang, Gerald L Knapp   +2 more
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