Title:	Heterogeneidade da relação entre produtividade da soja e severidade da ferrugem asiática: uma análise exploratória.
Authors:	MAIA, A. de H. N. DEL PONTE, E. M. GODOY, C. V.
Affiliation:	ALINE DE HOLANDA NUNES MAIA, CNPMA; EMERSON MEDEIROS DEL PONTE, UFRGS; CLAUDIA VIEIRA GODOY, CNPSO.
Date Issued:	2011
Citation:	In: ESCOLA DE MODELOS DE REGRESSÃO, 12., 2011, Fortaleza. Anais... Fortaleza: Universidade Federal do Ceará, Departamento de Estatística e Matemática Aplicada, 2011. 1 CD ROM.
Description:	This work aimed to conduct an exploratory, prior to meta-analysis, assessment of the heterogeneity of the linear relationship between soybean yield (Y) and the severity (X) of a foliar fungal disease (soybean rust) from 144 fungicide trials conducted in five years and 45 locations in Brazil. We used graphical analysis to explore the within- and between-trial variability of model parameter estimates (effect sizes) and summary measures for model goodness-of-fit and influence analysis. In the estimation of the weighted mean regression coefficients, following the metaanalysis concept, we propose a method that takes into account the magnitude of influence measures as well as the uncertainties of parameters estimates, usually the inverse of the standard error of for the parameter estimate. High between-trial heterogeneity was observed for parameter estimates, standard errors (within trial variability), determination coefficient and influence measures. Graphical analysis suggested influence of timing of disease onset and control yield class on model slope, which will be quantified further using a meta-analytical approach.
Thesagro:	Doença de planta Soja Ferrugem Análise estatística Regressão linear
Keywords:	Linear model Influence analysis Between-trials heterogeneity Ferrugem asiática
Type of Material:	Artigo em anais e proceedings
Access:	openAccess
Appears in Collections:	Artigo em anais de congresso (CNPMA)