Re: VCOV structure for GxE

From: Arthur <asremlforum_at_VSNI.CO.UK>
Date: Sun, 30 Aug 2009 09:40:13 +0100

Dear Jerko,

The main things affecting the speed of ASReml processing are the number of equations being solved
and the sparsity of the inverse. The inverse of a CORU matrix is fully dense
and typically GIV matrices are dense so your job is likely to be slow,
depending on the number of envoronments and the number of genotypes.

The XFA formulation is decidely faster than CORU for more than 10 environments.

Arthur Gilmour

Retired Principal Research Scientist (Biometrics)

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Received on Mon Aug 30 2009 - 09:40:13 EST

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