
For an R structure,
use the form rrcc
where rr is the number of a data
field containing the
coordinates for the first dimension and cc is the number of a data
field containing the coordinates for the second direction.
For example, in the analysis of spatial data, if the x
coordinate was in field 3 and the y coordinate was in field
4, the second argument would be 304.
fac(x,y) when
it relates to model term fac(x,y).
For example
...
y ~ mu ... !r fac(x,y)
...
fac(x,y) 1
fac(x,y) fac(x,y) IEUCV .7 1.3
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