Heterogeneous variance model in ASREML

From: KRISHNAMURTHY, SUBASH [AG/1000] <subash.krishnamurthy_at_MONSANTO.COM>
Date: Fri, 21 Aug 2009 14:38:42 -0500



I would like to fit a heterogeneous variance model for a data from an
across location Randomized Complete Block design, equivalent to SA PROC
MIXED statement as shown below along with the output from SAS. I will
appreciate if anyone can provide the appropriate syntax in ASREML for
the R matrix.


proc mixed data = temp;

    class rep location pedigree;

    model fruit_set_mean = pedigree location pedigree*location /

    random rep(location);

    repeated / group = location r rcorr;



Covariance Parameter Estimates


Cov Parm Group Estimate


Rep(Location) 0.002700

Residual Location L1 0.01740

Residual Location L2 0.005008

Residual Location L3 0.004578




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Received on Sat Aug 21 2009 - 14:38:42 EST

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