avaliação de quatro alternativas de análise de experimentos em látice quadrado, quanto à estimação de componentes de variância evaluation of four alternatives of analysis of experiments in square lattice, with emphasis on estimate of variance component
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Abstract
Estudou-se, no presente trabalho, a eficiência das seguintes alternativas de análise de experimentos realizados em látice quanto à precisão na estimação de componentes de variância, através da simulação computacional de dados: i) análise intrablocos do látice com tratamentos ajustados (primeira análise); ii) análise do látice em blocos casualizados completos (segunda análise); iii) análise intrablocos do látice com tratamentos não-ajustados (terceira análise); iv) análise do látice como blocos casualizados completos, utilizando as médias ajustadas dos tratamentos, obtidas a partir da análise com recuperação da informação interblocos, tendo como quadrado médio do resíduo a variância efetiva média dessa análise do látice (quarta análise). Os resultados obtidos mostram que se deve utilizar o modelo de análise intrablocos de experimentos em látice para se estimarem componentes de variância sempre que a eficiência relativa do delineamento em látice, em relação ao delineamento em Blocos Completos Casualizados, for superior a 100% e, em caso contrário, deve-se optar pelo modelo de análise em Blocos Casualizados Completos. A quarta alternativa de análise não deve ser recomendada em qualquer das duas situações.
The efficiency of fur alternatives of analysis of experiments in square lattice, related to the estimation of variance components, was studied through computational simulation of data: i) intrablock analysis of the lattice with adjusted treatments (first analysis); ii) lattices analysis as a randomized complete blocks design (second analysis); iii); intrablock analysis of the lattice with non-adjusted treatments (third analysis); iv) lattice analysis as a randomized complete blocks design, using the adjusted means of treatments, obtained through the analysis of lattice with recuperation of interblocks information, having as the residual mean square, the average effective variance of this same lattice analysis (fourth analysis). The results showed that the intrablock model, must be used with adjusted treatments in lattice experiments to estimate variance components every time that the relative efficiency of the lattice design, relatively to the randomized complete blocks design be upper to 100%, and in the opposite case the randomized complete blocks design model must be used. The fourth alternative of analysis must not be recommended in both situations.
The efficiency of fur alternatives of analysis of experiments in square lattice, related to the estimation of variance components, was studied through computational simulation of data: i) intrablock analysis of the lattice with adjusted treatments (first analysis); ii) lattices analysis as a randomized complete blocks design (second analysis); iii); intrablock analysis of the lattice with non-adjusted treatments (third analysis); iv) lattice analysis as a randomized complete blocks design, using the adjusted means of treatments, obtained through the analysis of lattice with recuperation of interblocks information, having as the residual mean square, the average effective variance of this same lattice analysis (fourth analysis). The results showed that the intrablock model, must be used with adjusted treatments in lattice experiments to estimate variance components every time that the relative efficiency of the lattice design, relatively to the randomized complete blocks design be upper to 100%, and in the opposite case the randomized complete blocks design model must be used. The fourth alternative of analysis must not be recommended in both situations.
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silva2000bragantiaavaliao
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| Authors | ;HEYDER DINIZ SILVA;DANIEL FURTADO FERREIRA;CLESO ANTÔNIO PATTO PACHECO |
| Journal | revista espanola de salud publica |
| Year | 2000 |
| DOI |
10.1590/S0006-87052000000100018
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