Re: multivariate genetic analysis using SPLUS asreml

see below
Brian Cullis
Research Leader, Biometrics &
Principal Research Scientist
NSW Department of Primary Industries
Wagga Wagga Agricultural Institute

Professor,
Faculty of Agriculture, Food & Natural Resources
The University of Sydney

Phone: 61 2 6938 1855
Fax: 61 2 6938 1809
Mobile: 0439 448 591

arthur.gilmour_at_DPI.NSW.GOV.AU
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18/10/2007 11:31 AM
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Re: multivariate genetic analysis using SPLUS asreml

Dear Derek,

I understand your main issue wanting to calculate the genetic correlation
and its standard error.

As we noted separately, ASReml-S does not appear to have the equivalent of
ASRemls .vvp
file. However, in the case of a multivariate model, the approximate
variance for the
variance parameters is just the inverse of the AI matrix which you do
have.

You seem to be saying though that you havn't properly sorted the function
to calculate the SE
of the derived correlation.

One work around is to parameterise the variance model so that the
correalation is directly
estimated. Then, its SE will be easily derived from the Z-ratio

I'm expert in ASReml rather than ASReml-S, but it should just be a matter
of
 replacing us(trait) with corgh(trait).
*******yes this is correct!

The model is equivalent, so you should be able to see the connection.

On the other issues, I support Brian's comments.

May Jesus Christ be gracious to you,

Arthur Gilmour, His servant .

Mixed model regression mapping for QTL detection in experimental crosses.
Computational Statistics and Data Analysis 51:3749-3764 now available at
http://dx.doi.org/10.1016/j.csda.2006.12.031

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mailto:Arthur.Gilmour_at_dpi.nsw.gov.au, arthur_at_cargovale.com.au
Principal Research Scientist (Biometrics)
NSW Department of Primary Industries
Orange Agricultural Institute, Forest Rd, ORANGE, 2800, AUSTRALIA

fax: 02 6391 3899; 02 6391 3922 Australia +61
telephone work: 02 6391 3815; home: 02 6364 3288; mobile: 0438 251 426

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Received on Mon Oct 18 2007 - 12:55:31 EST