Re: bivariate animal model

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
matrix.

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
Jesus went to the synagogue in every town in Galilee to preach and drive out demons.
A leper came, knelt down and said, "If you will, you can make me clean".
Jesus was moved. He reached out and touched him and said 
"I am willing.  Be clean." He was cleansed immediately.
Mobile Number +61 427 227 468
Home phone +61 2 6364 3288  Skype: Arthur.Gilmour
http://www.CargoVale.com.au/ASReml
Travel:
Brazil  Jul27 - Aug 8
UK      Aug 10-14
Mumbai  Aug 16-17