corRWave | R Documentation |
This function is a constructor for the 'corRWave'
class, representing a sine wave spatial correlation structure. Letting r denote the range, the correlation between two observations a distance d apart is sin(d/r)/(d/r).
corRWave(value = numeric(0), form = ~ 1, metric = c("euclidean", "maximum", "manhattan", "haversine"), radius = 3956)
value |
optional numeric “range” parameter value for the sine wave correlation structure, which must be greater than zero. Defaults to |
form |
one-sided formula of the form |
metric |
optional character string specifying the distance metric to be used. The currently available options are |
radius |
radius to be used in the haversine formula for great-circle distance. Defaults to the Earth's radius of 3,956 miles. |
Object of class 'corRWave'
, also inheriting from class 'corRSpatial'
, representing a sine wave spatial correlation structure.
When "haversine"
is used as the distance metric, longitude and latitude coordinates must be given as the first and second covariates, respectively, in the formula specification for the form
argument.
Brian Smith brian-j-smith@uiowa.edu
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.
corRClasses
sp1 <- corRWave(form = ~ x + y + z) spatDat <- data.frame(x = (0:4)/4, y = (0:4)/4) cs1Wave <- corRWave(1, form = ~ x + y) cs1Wave <- Initialize(cs1Wave, spatDat) corMatrix(cs1Wave) cs2Wave <- corRWave(1, form = ~ x + y, metric = "man") cs2Wave <- Initialize(cs2Wave, spatDat) corMatrix(cs2Wave)
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