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> From: Chungui Qiao <c.qiao@mailbox.uq.edu.au>
> To: "'asreml@ram.chiswick.anprod.csiro.au'"
<asreml@ram.chiswick.anprod.csiro.au>
> Subject: Estimate of the grand mean for genotypes
> Date: Tue, 16 Feb 1999 15:18:46 +1000
>
> Hi there,
>
> Could anybody give me some advice on how to define a proper model to
> estimate the grand mean for genotypes in the combined analysis of variance
> for unbalanced multi-year multi-location variety trials data?
>
> The model I tried was:
>
> Yield !WT=wt ~ mu trial !r genotype genotype.year genotype.location
> genotype.year.location !f mv
>
> But the estimate of the grand mean for genotypes in the *.sln file seems
> too small, even though the BLUPs (genotype effects) seem to be sensible.
> Your comment on the model is greatly appreciated.
>
I expect from this analysis that the trial_1 effect would be zero
so that the mu effect is actually the mean of trial 1.
If you want the mean of all trials, fit trial as c(trial)
Assuming no singularities then occur, mu will be an overal mean
and the c(trial) effects will be trial specifi deviations
from that mean. The deviation for the last trial will be
-(sum of the c(trial) effects).
Arthur
>
> Cheers
>
> ***********************************************
> * Chungui Qiao *
> * School of Land and Food *
> * The University of Queensland *
> * St Lucia, QLD 4072 *
> * Phone: +61 7 3365 2859 (W) *
> * Fax: +61 7 3365 1177(W) *
> * Email: c.qiao@mailbox.uq.edu.au *
> ***********************************************
>
>
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Arthur Gilmour PhD email: Arthur.Gilmour@agric.nsw.gov.au
Senior Research Scientist (Biometrics) fax: <61> 2 6391 3899
NSW Agriculture <61> 2 6391 3922
Orange Agricultural Institute telephone work: <61> 2 6391 3815
Forest Rd, ORANGE, 2800, AUSTRALIA home: <61> 2 6362 0046
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