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Mixed models for genotype by environment tables with an emphasis on heteroscedasticity

Abstract : Stability is a central keyword for plant breeders analysing genotype by environment data, a simple corresponding statistical term is "dispersion around a central value". So a natural way to approach genotype environment interactions is to model variances as well as expectations in relation to genotypes and/or environments. After reviewing classical models, we try to present a general scheme for describing heteroscedasticity with a reduced number of parameters using the framework of mixed models. This allows us to propose new parsimonious models. Two genuine data sets exemplify the concepts: the first concerns the virus-resistance of ten sugar beet cultivars to a virus grown at six different locations; the second involves three factors: variety, soil and year in a potato experiment.
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https://hal.inrae.fr/hal-02838432
Déposant : Migration Prodinra <>
Soumis le : dimanche 7 juin 2020 - 12:37:21
Dernière modification le : vendredi 12 juin 2020 - 10:43:26

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  • HAL Id : hal-02838432, version 1
  • PRODINRA : 130227

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J.B. Denis, H.P. Piepho, A. van Eeuwijk. Mixed models for genotype by environment tables with an emphasis on heteroscedasticity. 23 p., 1996. ⟨hal-02838432⟩

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