Directional (version 5.7)

Contour plot of the Kent distribution for some data: Contour plot of the Kent distribution for some data

Description

The contour plot of the Kent distribution on the sphere for some data is produced.

Usage

kent.datacontour(x, lat = 20, long = 20)

Value

A plot containing the contours of the distribution along with the data.

Arguments

x

A two column matrix, where the first column is the latitude and the second comlumn is the longitude. If the matrix has two columns, it is assumed to have unit vectors and in this case it is turned into latitude and longitude.

lat

A positive number determing the range of degrees to move left and right from the latitude center. See the example to better understand this argument.

long

A positive number determing the range of degrees to move up and down from the longitude center. See the example to better understand this argument.

Author

Michail Tsagris and Christos Adam.

R implementation and documentation: Michail Tsagris and Christos Adam .

Details

MLE of the parameters of the Kent distribution is performed, then the contour plot is plotted using these estimates and finally the data are also plotted.

References

Kent John (1982). The Fisher-Bingham distribution on the sphere. Journal of the Royal Statistical Society, Series B, 44(1): 71-80.

See Also

kent.contour, kent.mle, vmf.kerncontour

Examples

x <- rvmf(100, rnorm(3), 10)
kent.mle(x)
y <- euclid.inv(x)
# \donttest{
kent.datacontour(y)
kent.datacontour(y, lat = 30, long = 30)
# }