Re: problems converging

From: <arthur.gilmour_at_DPI.NSW.GOV.AU>
Date: Tue, 1 Nov 2005 10:50:32 +1100

Dear Heidi,
I note you are using an old version of ASReml
and that the output appears to relate to a simpler model than the input
you supplied.

The first problem is that your residual matrix is not positive definite.
This could be generating the problems you are having.

You may have partly done this but I would

1. Analyse the two sites separately for a bivariate model.
2. Analyse the traits separately for a two site model
3. Then generate a combined analysis if it seems plausible.

Your model allows for different clonal variances for each site but not
different residual variances
which is likely also to cause trouble.

I would think you penultimate model would allow
    bivariate residual error within each site

    4 x 100 structure for Site.Trait.clone

If this model worked, then you could split the latter component into
genetic and non-genetic parts.

thanking God for His mercy through Name of Jesus Christ.

Arthur Gilmour PhD

PS. Check out
Principal Research Scientist (Biometrics)
NSW Department of Primary Industries
Orange Agricultural Institute, Forest Rd, ORANGE, 2800, AUSTRALIA

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Received on Mon Nov 01 2005 - 10:50:32 EST

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