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Titolo:
GENETIC-VARIATION OF TRAITS MEASURED IN SEVERAL ENVIRONMENTS .1. ESTIMATION AND TESTING OF HOMOGENEOUS GENETIC AND INTRA-CLASS CORRELATIONSBETWEEN ENVIRONMENTS
Autore:
ROBERT C; FOULLEY JL; DUCROCQ V;
Indirizzi:
INRA,CTR RECH JOUY EN JOSAS,GENET QUANTITAT & APPL STN F-78352 JOUY EN JOSAS FRANCE
Titolo Testata:
Genetics selection evolution
fascicolo: 2, volume: 27, anno: 1995,
pagine: 111 - 123
SICI:
0999-193X(1995)27:2<111:GOTMIS>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAXIMUM-LIKELIHOOD; RESIDUAL VARIANCES; MODELS; PARAMETERS; COMPONENTS; ALGORITHM;
Keywords:
HETEROSKEDASTICITY; GENETIC CORRELATION; INTRA-CLASS CORRELATION; EXPECTATION-MAXIMIZATION; RESTRICTED MAXIMUM LIKELIHOOD;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
C. Robert et al., "GENETIC-VARIATION OF TRAITS MEASURED IN SEVERAL ENVIRONMENTS .1. ESTIMATION AND TESTING OF HOMOGENEOUS GENETIC AND INTRA-CLASS CORRELATIONSBETWEEN ENVIRONMENTS", Genetics selection evolution, 27(2), 1995, pp. 111-123

Abstract

Estimation of between family (or genotype) components of (co)varianceamong environments, testing of homogeneity of genetic correlations between environments, and testing of homogeneity of both genetic and intra-class correlations between environments are investigated. The testing procedures are based on the ratio of maximized log-restricted likelihoods for the reduced (under each hypothesis of homogeneity) and saturated models, respectively. An expectation-maximization (EM) iterativealgorithm is proposed for calculating restricted maximum likelihood (REML) estimates of the residual and between-family components of (co)variance. The EM formulae are applied to the multiple trait linear model for the saturated model and to the univariate linear model for the reduced models. The EM algorithm guarantees that (co)variance estimatesremain within the parameter space. The procedures presented in this paper are illustrated with the analysis of 5 vegetative and reproductive traits recorded in an experiment on 20 full-sib families of black medic (Medicago lupulina L) tested in 3 environments.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 13:04:00