Please excuse this question,the answer to which should be
obvious, but is baffling me. Using the asreml splus add on
I wish to determine the variances and covariances for two
traits. The command issued is
HS.asr <- asreml(cbind(TRAIT1,TRAIT2)~trait,
random=~ped(Animal,var=T)+Dam,
rcov=~units:us(trait),
ginverse=list(Animal=AINV), data=Data)
summary(HS.asr)$varcomp
which gives
gamma component std.error
z.ratio
ped(Animal, var = T) 0.04206207 0.04206207 0.014288383
2.9437953
Dam 0.00377920 0.00377920 0.006370836
0.5932031
R!variance 1.00000000 1.00000000
NA NA
R!trait.TRAIT1:TRAIT1 1.75769701 1.75769701 0.054551955
32.2206051
R!trait.TRAIT2:TRAIT1 0.22529479 0.22529479 0.015193119
14.8287390
R!trait.TRAIT2:TRAIT2 0.14791726 0.14791726 0.008980163
16.4715568
constraint
ped(Animal, var = T) Positive
Dam Positive
R!variance Fixed
R!trait.TRAIT1:TRAIT1 Unconstrained
R!trait.TRAIT2:TRAIT1 Unconstrained
R!trait.TRAIT2:TRAIT2 Unconstrained
Which are the phenotypic and genetic (co)variance components
for the two traits?
Sincerely,
Derek
Derek Roff,
Department of Biology,
University of California,
Riverside,
CA 92521
USA
Received on Mon Oct 11 2007 - 15:09:38 EST
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