involve an initial non-zero variance component or ratio (relative to the residual variance) default 0.1;
the initial value can be specified after the model term or
if the variance structure is not scaled identity, it must be
defined using a
G structure definition.
an initial value of its variance (ratio)
may be followed by a !GP (keep positive, the default),
!GU (unrestricted)
or !GF (fixed) qualifier,
wwt ~ mu Year age !r sire 0.15 !GP
use !{ and
!}
to
group model terms
that may not be
reordered. Normally ASReml will reorder the
model terms in the sparse equations - putting smaller terms
first to speed up calculations. However, the order must be preserved
if the user defines a structure for a term which also covers the
following term(s) (a way of defining a covariance structure across model
terms).
Grouping is specifically required if the model terms are of differing
sizes (number of effects). For example, for traits
weaningwight
and yearlingwight, an animal
model with maternal weaning weight should specify model terms
!{ Trait.animal at(Trait,1).dam !}
when fitting a genetic
covariance between the direct and maternal effects.