Heterogeneous Variances in Multi-Environment Yield Trials for Corn Hybrids

dc.contributor.author Orellana, Massiel
dc.contributor.author Edwards, Jode
dc.contributor.author Carriquiry, Alicia
dc.contributor.author Carriquiry, Alicia
dc.contributor.department Statistics
dc.date 2018-02-17T06:18:30.000
dc.date.accessioned 2020-07-02T06:57:47Z
dc.date.available 2020-07-02T06:57:47Z
dc.date.issued 2014-04-01
dc.description.abstract <p>Recent developments in statistics and computing have enabled much greater levels of complexity in statistical models of multi-environment yield trial data. One particular feature of interest to breeders is simultaneously modeling heterogeneity of variances among environments and hybrids. Our objective was to estimate the level of heterogeneity of genotype by environment interaction variance and error variance in the Iowa Crop Performance Test for Corn. A Bayesian approach was used to estimate variance components in a hierarchical model that allows for heterogeneous error and genotypeby- environment interaction (GEI) variances applied to corn yield data from the Iowa Crop Performance Test performed between 1995 and 2005. An average of 508 hybrids were tested per year with very little overlap between locations and years, which resulted in a very unbalanced data set. We divided the data into 16 subsets to study the effect of variability across locations and years. We found GEI and error variances to be heterogeneous among both environments and genotypes. Our results for corn contrasted previous work on oat (Avena sativa L.) in which very little heterogeneity was found for error variance among cultivars suggesting that different corn (Zea mays L.) hybrids can have different genotype by environment interaction variances and different error variances.</p>
dc.description.comments <p>This article is from <em>Crop Science</em> 54 (2014): 1048, doi: <a href="http://dx.doi.org/10.2135/cropsci2013.09.0653" target="_blank">10.2135/cropsci2013.09.0653</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/stat_las_pubs/31/
dc.identifier.articleid 1027
dc.identifier.contextkey 7853246
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath stat_las_pubs/31
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/90628
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/stat_las_pubs/31/2014_CarriquiryAL_HeterogeneousVariancesMulti.pdf|||Fri Jan 14 23:30:30 UTC 2022
dc.source.uri 10.2135/cropsci2013.09.0653
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Statistics and Probability
dc.title Heterogeneous Variances in Multi-Environment Yield Trials for Corn Hybrids
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 6ddd5891-2ad0-4a93-89e5-8c35c28b0de4
relation.isOrgUnitOfPublication 264904d9-9e66-4169-8e11-034e537ddbca
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