Contour plot of the normal distribution in S^2: Contour plot of the normal distribution in \(S^2\)
Description
Contour plot of the normal distribution in \(S^2\).
Usage
compnorm.contour(m, s, type = "alr", n = 100, x = NULL, cont.line = FALSE)
Arguments
m
The mean vector.
s
The covariance matrix.
type
The type of trasformation used, either the additive log-ratio ("alr"),
the isometric log-ratio ("ilr") or the pivot coordinate ("pivot") transformation.
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.
Value
A ternary diagram with the points (if appear = TRUE) and the bivariate normal contour lines.
Details
The alr or the ilr transformation is applied to the compositional data at first. Then
for a grid of points within the 2-dimensional simplex the bivariate normal density is
calculated and the contours are plotted along with the points.