TAILIEUCHUNG - Báo cáo sinh học: "Estimating variances and covariances for bivariate animal models using scaling and transformation"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Estimating variances and covariances for bivariate animal models using scaling and transformation | Genet Sei Evol 1995 27 33-42 Elsevier INRA 33 Original article Estimating variances and covariances for bivariate animal models using scaling and transformation R Thompson1 RE Crump1 J Juga1 PM Visscher2 t 1 Roslin Institute Edinburgh formerly AFRC Institute of Animal Physiology and Genetics Research Edinburgh Research Station Roslin Midlothian EH25 9PSr 2 Institute of Cell Animal and Population Biology University of Edinburgh West Mains Road Edinburgh EH9 3JT UK Received 4 August 1993 accepted 1st September 1994 Summary - The estimation of genetic parameters in bivariate animal models is considered. It is shown that in a variety of models the computation can be reduced by introducing scaled and transformed independent traits. This allows maximization over smaller dimensions of parameter space. In 1 numerical example the procedure reduced the computation by a factor of 8. The advantages of transformed models are outlined. variance estimation covariance estimation animal model transformation Résumé L estimation des variances et covariances dans un modèle individuel à 2 caractères après standardisation et transformation des variables. Cet article traite de I estimation des paramètres génétiques dans un modèle individuel à 2 variables. On montre que dans beaucoup de situations le temps de calcul peut être diminué en standardisant les caractères et en les rendant indépendants par une transformation ce qui permet une maximisation sur un espace de paramètres de moindre dimension. Un exemple numérique particulier montre que le temps de calcul est divisé par 8. Les avantages des differents modèles transformes sont présentés. estimation de variance estimation de covariance modèle animal transformation Present Address Genetics and Behavioural Sciences Department Scottish Agricultural College Edinburgh West Mains Road Edinburgh EH9 3JG UK. Present Address The Finnish Animal Breeding Association PO Box 40 SF-01301 Vantaa Finland. t Present address Roslin Institute Edinburgh .

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