TAILIEUCHUNG - báo cáo khoa học: "Constructing categories for polychotomous variates"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Constructing categories for polychotomous variates | Génét. Sél. Evol. 1986 18 1 25-30 Constructing categories for polychotomous variates H. IWAISAKI Department of Animal Science College of Agriculture Kyoto University Kyoto-shi 606 Japan Summary The objective of this study was to find using numerical methods a configuration of response categories which maximizes the ratio of heritability in a discrete scale to that in the underlying normal scale for polychotomous characters. It is shown that to maximize this ratio it is necessary to construct a symmetric discrete distribution with symmetrically spaced weights for the categories of response. The thresholds that maximize the ratio are located at the arithmetic mean of the expected values on a normal scale of contiguous categories. The value of the ratio for the Optimal discrete distribution found in this study is compared with those for some other discrete distributions. Key words Categories polychotomous variates heritability. Resume Construction de categories pour des variables polychotomiques Le but de cette étude est d etablir par des méthodes numériques une configuration des categories de réponse qui maximise le rapport de rhéritabilité d un caractère polychotomique definie sur une echelle discrete à celle definie sur 1 échelle normale sous-jacente. On montre que pour maximiser ce rapport il est nécessaire de construire une distribution discrète symétrique avec des scores répartis symétriquement dans les diverses categories de réponse. Les seuils qui maximisent le rapport considéré sont égaux aux moyennes arithmétiques des espérances mathéma-tiques sur une échelle normale des categories adjacentes. On compare la valeur du rapport des héritabilités correspondant à la distribution discrete optimale trouvée dans Cette étude à celles correspondant à quelques autres distributions discretes. Mots clés Categories variables polychotomiques héritabilité. I. Introduction Threshold characters present a discrete phenotypic distribution and heritability on such a scale .

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