Estimação e predição por modelo linear misto com ênfase na ordenação de médias de tratamentos genéticos
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Data
2001-03
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Resumo
This study reviewed the theory of estimation/prediction of treatment means, in randomized block
designs, emphasizing aspects of interest to plant breeders. Comparisons were made between analyses based
on fixed (intrablock) and mixed (with random treatments effects - recovering intergenotypic information) linear
models for identifying the determining factors that may affect the classification of genotypes. The mixed model
approach, in comparison with the traditional analyses (marginal means and intrablock analysis), in general,
leads to: i) more uniformly distributed treatment means; and ii) selection of different genetic treatments when
the genetic variance is small relative to the environmental variance, as well as designs being non-orthogonal
and unbalanced. In addition, if treatments of distinct reference populations are evaluated in the same experiment,
BLUP prediction can lead to different ranking of means, in comparison with the intrablock analysis, even if
designs are balanced and orthogonal.
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Palavras-chave
Information recovering, Recuperação de informação, Delineamento em bloco, Seleção genotípica, Média BLUP, Ordenamento, Block design, BLUP mean, Genotypic selection, Shrinkage
Citação
DUARTE, João Batista; VENCOVSKY, Roland. Estimação e predição por modelo linear misto com ênfase na ordenação de médias de tratamentos genéticos. Scientia Agricola, Piracicaba, v. 58, n. 1, p. 109-117, jan./mar. 2001.