corLin: Linear Correlation Structure
Description
This function is a constructor for the corLin class,
representing a linear spatial correlation structure. Letting
$d$ denote the range and $n$ denote the nugget
effect, the correlation between two observations a distance
$r < d$ apart is $1-(r/d)$ when no nugget effect
is present and $(1-n) (1 -(r/d))$ when a nugget
effect is assumed. If $r \geq d$ the correlation is
zero. Objects created using this constructor must later be
initialized using the appropriate Initialize method.Usage
corLin(value, form, nugget, metric, fixed)
Value
an object of class corLin, also inheriting from class
corSpatial, representing a linear spatial correlation
structure.References
Cressie, N.A.C. (1993), "Statistics for Spatial Data", J. Wiley & Sons.
Venables, W.N. and Ripley, B.D. (1997) "Modern Applied Statistics with
S-plus", 2nd Edition, Springer-Verlag.
Littel, Milliken, Stroup, and Wolfinger (1996) "SAS Systems for Mixed
Models", SAS Institute.