Description Usage Arguments Value Note Author(s) References See Also Examples

This function is a constructor for the `'corRExpwr'`

class, representing a powered exponential spatial correlation structure. Letting *r* denote the range and *p* the shape, the correlation between two observations a distance *d* apart is *exp(-(d/r)^p)*.

1 2 3 |

`value` |
optional numeric vector of two parameter values for the powered exponential correlation structure, corresponding to the “range” and “shape”. The range parameter value must be greater than zero, and the shape in the interval (0, 2]. 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 `'corRExpwr'`

, also inheriting from class `'corRSpatial'`

, representing a powered exponential 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 [email protected]

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.

1 2 3 4 5 6 7 8 9 10 11 | ```
sp1 <- corRExpwr(form = ~ x + y + z)
spatDat <- data.frame(x = (0:4)/4, y = (0:4)/4)
cs1Expwr <- corRExpwr(c(1, 1), form = ~ x + y)
cs1Expwr <- Initialize(cs1Expwr, spatDat)
corMatrix(cs1Expwr)
cs2Expwr <- corRExpwr(c(1, 1), form = ~ x + y, metric = "man")
cs2Expwr <- Initialize(cs2Expwr, spatDat)
corMatrix(cs2Expwr)
``` |

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