Re: Bivariate random regressions

I have ASReml code for a bivariate RR if you want it.... it ran fine
(although I didn't like the answers..)

M R Robinson wrote:
> Hello,
>
> I wish to run a bivariate animal model and then build this up into a
> bivariate random regression and I was hoping for some help.
>
> I want to model how two traits covary firstly phenotypically and then
> dividing phenotypic variance into additive and residual components.
>
> So as an example I can run random regressions each trait in this way:
>
> ANIMAL !P # pedigree factor, refers to pedigree file
> INC # horn increment growth in sheep
> AGE !A # age as a factor in years 1-5
> sAGE !A # standardized age (-1 to 1)
> CYR !A # year of measurement to control for
> # environmental effects during the year of growth
> WEIGHT # weight of the sheep measured in
>
> Sheep1.ped !ALPHA !MAKE !SKIP 1
> incNHMalesrr.asd !SKIP 1 !DOPART 1 !MAXIT 100
>
> !part1
> !MVREMOVE
>
> INC ~ mu AGE CYR !f mv
>
> 1 2 0 !STEP 0.01
>
> 500
> AGE 0 US !GP
> 10*0
>
> !part2
> !MVREMOVE
> !PVAL sAGE -1 -0.5 0 0.5 1
>
>
> INC ~ mu AGE CYR !r leg(sAGE,2).ANIMAL !f mv
>
> 1 2 1 !STEP 0.01
>
> 500
> AGE 0 US !GP
> 10*0
>
> leg(sAGE,2).ANIMAL 2
> leg(sAGE,2) 0 US
> 0.1
> 0 0.1
> 0 0 0.1
> ANIMAL
>
> The first part gives me phenotypic correlations and covariances for
> horn growth and the second part then breaks this down into additive and
> residual components using a second order polynomial.
>
> I know the methodology for running a bivariate model:
>
> !part3
>
> INC WEIGHT ~ Trait Trait.AGE !r Trait.ANIMAL
>
> 1 2 1
>
>
> Trait 0 US
> 3*0
>
> Trait.ANIMAL 2
> Trait 0 US
> 3*0
> ANIMAL
>
> However I have no idea how to merge the analysis methods and seperate
> both the variances and covariances into the five age groups which I
> have. This would be important to me as I want to look at how early
> investment in in weight and horn growth affect later trait development
> and whether there's any evidence of changing phenotypic, and genetic
> correlations with age.
>
> Any help would be greatly appreciated and I thank-you very much for
> your time.
>
> King regards,
> Matthew
>
> *********************************
> Matt Robinson
> Institute of Evolutionary Biology
> University of Edinburgh
> UK
> *********************************

--
Alastair J Wilson
NERC Research Fellow
Alastair.Wilson_at_ed.ac.uk
http://www.biology.ed.ac.uk/research/groups/awilson/
tel. 0131 6513673
Institute of Evolutionary Biology
School of Biological Sciences
The University of Edinburgh
Ashworth Laboratories
The King's Buildings
West Mains Road
Edinburgh EH9 3JT, UK