Multivariate t random values simulation on the simplex
Multivariate t random values simulation on the simplex.
rcompt(n, m, s, dof, type = "alr")
n |
The sample size, a numerical value. |
m |
The mean vector in R^d. |
s |
The covariance matrix in R^d. |
dof |
The degrees of freedom. |
type |
The alr (type = "alr") or the ilr (type = "ilr") is to be used for closing the Euclidean data onto the simplex. |
The algorithm is straightforward, generate random values from a multivariate t distribution in R^d and brings the values to the simplex S^d using the inverse of a log-ratio transformation.
A matrix with the simulated data.
Michail Tsagris
R implementation and documentation: Michail Tsagris mtsagris@uoc.gr and Giorgos Athineou <gioathineou@gmail.com>
Aitchison J. (1986). The statistical analysis of compositional data. Chapman \& Hall.
x <- as.matrix(iris[, 1:2]) m <- Rfast::colmeans(x) s <- var(x) y <- rcompt(100, m, s, 10) comp.den(y, dist = "t") ternary(y)
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