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A comparison of analysis methods for late-stage variety evaluation trials

Journal Article


Abstract


  • The statistical analysis of late-stage variety evaluation trials using a mixed model is described,

    with one- or two-stage approaches to the analysis. Two sets of trials, from Australia and

    the UK, were used to provide realistic scenarios for a simulation study to evaluate the

    different methods of analysis. This study showed that a one-stage approach gave the most

    accurate predictions of variety performance overall or within each environment, across a

    range of models, as measured by mean squared error of prediction or realized genetic gain. A

    weighted two-stage approach performed adequately for variety predictions both overall and

    within environments, but a two-stage unweighted approach performed poorly in both cases.

    A generalized heritability measure was developed to compare methods.

Publication Date


  • 2010

Citation


  • Welham, S. J., Gogel, B. J., Smith, A. B., Thompson, R. & Cullis, B. R. (2010). A comparison of analysis methods for late-stage variety evaluation trials. Australian and New Zealand Journal of Statistics, 52 (2), 125-149.

Scopus Eid


  • 2-s2.0-77954124147

Ro Metadata Url


  • http://ro.uow.edu.au/infopapers/2103

Has Global Citation Frequency


Number Of Pages


  • 24

Start Page


  • 125

End Page


  • 149

Volume


  • 52

Issue


  • 2

Place Of Publication


  • Australia

Abstract


  • The statistical analysis of late-stage variety evaluation trials using a mixed model is described,

    with one- or two-stage approaches to the analysis. Two sets of trials, from Australia and

    the UK, were used to provide realistic scenarios for a simulation study to evaluate the

    different methods of analysis. This study showed that a one-stage approach gave the most

    accurate predictions of variety performance overall or within each environment, across a

    range of models, as measured by mean squared error of prediction or realized genetic gain. A

    weighted two-stage approach performed adequately for variety predictions both overall and

    within environments, but a two-stage unweighted approach performed poorly in both cases.

    A generalized heritability measure was developed to compare methods.

Publication Date


  • 2010

Citation


  • Welham, S. J., Gogel, B. J., Smith, A. B., Thompson, R. & Cullis, B. R. (2010). A comparison of analysis methods for late-stage variety evaluation trials. Australian and New Zealand Journal of Statistics, 52 (2), 125-149.

Scopus Eid


  • 2-s2.0-77954124147

Ro Metadata Url


  • http://ro.uow.edu.au/infopapers/2103

Has Global Citation Frequency


Number Of Pages


  • 24

Start Page


  • 125

End Page


  • 149

Volume


  • 52

Issue


  • 2

Place Of Publication


  • Australia