Re: bivariate animal model

From: Arthur Gilmour <arthur.gilmour_at_CARGOVALE.COM.AU>
Date: Thu, 4 Jun 2009 07:33:36 +1000

Dear All,
Indeed, and I believe ASReml 3 will allow XFA for a 2x2 matrix
(for the case when you want to fix PSIs to zero).

However, ASReml does not allow FA or FACV to be specified for a 2x2

On Wed, 2009-06-03 at 14:40 +1000, brian.cullis_at_DPI.NSW.GOV.AU wrote:
> 2) Since you are using only 2 traits, you cannot use FA models.
> The FA model has 4 parameters but there are only three degreesof
> freedom
> for parameters in a 2x2 symmetric matrix.
> ****yes this is true for this example, but it is possible though
> perverse perhaps to use FA models for a 2x2 structure, should you want
> to be able to cope with reduced rank models
> by suitably fixing parameters to zero.

Best Wishes,
Arthur Gilmour
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Received on Fri Jun 04 2009 - 07:33:36 EST

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