1999
DOI: 10.1590/s0103-90161999000500014
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Hipóteses estatísticas com dados desbalanceados nos modelos com três fatores de efeitos fixos hierarquizados

Abstract: Este trabalho tem por objetivo formalizar os termos das respectivas somas de quadrados e hipóteses mais usuais, que são testadas nos modelos com três fatores de efeitos fixos hierarquizados para dados desbalanceados. Discute-se, também, o problema da interpretação de hipóteses associadas às somas de quadrados, bem como comparam-se os resultados fornecidos por alguns softwares estatísticos.

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“…Six traits evaluated presented slight deviations from normality, but the analyses of variance (Anova) were processed from the original data. The data concerning the traits NBWB and NIWB, expressed as a percentage and represented by the variable x, presented large deviations from normality, and thus, were transformed using the following function Y: Y= √x+0.5 Data were processed by univariate Anova, in hierarchical scheme (Oikawa and Iemma 1999;Dias and Barros 2009), for estimation of variance components in each of the three levels of population subdivision: among basin (Bi), among accessions within basins (Aj(i)) and between trees within accessions and basins (Tk(ij)). The random effects of Bi, Aj(i), Tk(ij) were assumed independent with averages 0 and variances equal to 𝜎 𝑏 2 , 𝜎 𝑎 2 , 𝜎 𝑡 2 , respectively.…”
Section: Statistical Proceduresmentioning
confidence: 99%
“…Six traits evaluated presented slight deviations from normality, but the analyses of variance (Anova) were processed from the original data. The data concerning the traits NBWB and NIWB, expressed as a percentage and represented by the variable x, presented large deviations from normality, and thus, were transformed using the following function Y: Y= √x+0.5 Data were processed by univariate Anova, in hierarchical scheme (Oikawa and Iemma 1999;Dias and Barros 2009), for estimation of variance components in each of the three levels of population subdivision: among basin (Bi), among accessions within basins (Aj(i)) and between trees within accessions and basins (Tk(ij)). The random effects of Bi, Aj(i), Tk(ij) were assumed independent with averages 0 and variances equal to 𝜎 𝑏 2 , 𝜎 𝑎 2 , 𝜎 𝑡 2 , respectively.…”
Section: Statistical Proceduresmentioning
confidence: 99%
“…Visando exemplificar numericamente os conceitos sobre dados desbalanceados e caselas vazias, apresenta-se aqui, parte dos dados provenientes do peso de bezerros da raça Canchim e reproduzidos em Oikawa [3]. Os dados apresentados seguem a estrutura de um modelo com dois fatores, onde as fontes de variações (fatores) são dadas pelo sexo do bezerro (efeito de linhas) e pela origem do bezerro (efeito de colunas).…”
Section: Introductionunclassified