| Contour plot of the Dirichlet distribution in S^2 {Compositional} | R Documentation |
Contour plot of the Dirichlet distribution in S^2
Description
Contour plot of the Dirichlet distribution in S^2.
Usage
diri.contour(a, n = 100, x = NULL, cont.line = FALSE)
Arguments
a |
A vector with three elements corresponding to the 3 (estimated) parameters. |
n |
The number of grid points to consider over which the density is calculated. |
x |
This is either NULL (no data) or contains a 3 column matrix with compositional data. |
cont.line |
Do you want the contour lines to appear? If yes, set this TRUE. |
Details
The user can plot only the contour lines of a Dirichlet with a given vector of parameters, or can also add the relevant data should he/she wish to.
Value
A ternary diagram with the points and the Dirichlet contour lines.
Author(s)
Michail Tsagris and Christos Adam.
R implementation and documentation: Michail Tsagris mtsagris@uoc.gr and Christos Adam pada4m4@gmail.com.
References
Ng Kai Wang, Guo-Liang Tian and Man-Lai Tang (2011). Dirichlet and related distributions: Theory, methods and applications. John Wiley & Sons.
Aitchison J. (1986). The statistical analysis of compositional data. Chapman & Hall.
See Also
mixdiri.contour, gendiri.contour, compnorm.contour,
comp.kerncontour, mix.compnorm.contour
Examples
x <- as.matrix( iris[, 1:3] )
x <- x / rowSums(x)
diri.contour( a = c(3, 4, 2) )