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corRatio class,
representing a rational quadratic spatial correlation structure. Letting
$d$ denote the range and $n$ denote the nugget
effect, the correlation between two observations a distance
$r$ apart is $(r/d)^2/(1+(r/d)^2)$ when no nugget effect
is present and
$(1-n)(r/d)^2/(1+(r/d)^2)$ when a
nugget effect is assumed. Objects created using this constructor need
to be later initialized using the appropriate Initialize
method.corRatio(value, form, nugget, metric, fixed)corRatio, also inheriting from class
corSpatial, representing a rational quadratic spatial correlation
structure.Initialize.corStruct, distsp1 <- corRatio(form = ~ x + y + z)Run the code above in your browser using DataLab