Setting covariate grouping levels:
!FACPOINTS and !POLPOINTS
The fac()
and pol() model terms need to classify a covariate
into discrete classes. This is usually done on the basis of
unique covariate values. However, ASReml actually treats
close points as being the same. This is controlled by
!FACPOINTS n
affects the number of distinct points
recognised by the fac() model function. The default value of
n is 1000 so that points closer than 0.1% of the range are
regarded as the same point.
!POLPOINTS n
affects the
number of distinct points recognised by the pol() model
function. The default value of n is 1000 so that points closer
than 0.1% of the range are regarded as the same
point.
Example
One use of facpoints is in association with fac(dam,year)
used to define a concise interaction of dam
and year, where there are more than 1000 dams.
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