Compositional (version 1.2)

diri.contour: Contour plot of a Dirichlet distribution in $S^2$

Description

Contour plot of a Dirichlet distribution in $S^2$.

Usage

diri.contour(a, n = 100, x = NULL)

Arguments

a

A matrix with the compositional data. It has to be a 3 column matrix.

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.

Value

• A ternary diagram with the points and the Dirichlet contour lines.

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.

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

norm.contour, bivt.contour, comp.kerncontour, mixnorm.contour

Examples

x <- iris[, 1:3]
x <- x / rowSums(x)
diri.contour( a = c(3, 4, 2) )