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The analysis of the NSW wheat variety database. I. Modelling trial error variance


The retrospective analysis of a large database on wheat variety testing in New South Wales (NSW) is considered. This analysis involved three key steps. Initially error variance heterogeneity is modelled, indicating significant differences in error variance due to trial location, year of trialling, sowing date and trial mean yield. The implication of this modelling for the estimaion of variance components is discussed.

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Communicated by G. Wenzel

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Cullis, B.R., Thomson, F.M., Fisher, J.A. et al. The analysis of the NSW wheat variety database. I. Modelling trial error variance. Theoret. Appl. Genetics 92, 21–27 (1996).

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Key words

  • Genotype-by-environment interaction
  • Variance heterogeneity