https://github.com/cran/robCompositions
Tip revision: 608a88e9639a4be776be79af369b32860fc984a7 authored by Matthias Templ on 12 July 2017, 18:31:22 UTC
version 2.0.5
version 2.0.5
Tip revision: 608a88e
balZav.R
#' New average symmetric coordinates
#'
#'
#' @param x compositional data
#' @return \item{Z.av}{A matrix of new average symmetric coordinates.}
#' @author Petra Kynclova
balZav <- function(x){
D <- ncol(x)
Z.av <- matrix(NA,ncol=2,nrow=nrow(x))
p1 <- sqrt(D-1+sqrt(D*(D-2)))/sqrt(2*D)
#if(D==2) stop average calculation...
if(D==3){
p2 <- x[,3]
}
else{
p2 <- apply(x[,3:D],1,prod)
}
p3 <- (sqrt(D-2)+sqrt(D))/(sqrt(D-2)*(D-1+sqrt(D*(D-2))))
p4 <- 1/(D-1+sqrt(D*(D-2)))
Z.av[,1] <- p1*(log(x[,1]/(x[,2]^p4 * p2^p3)))
Z.av[,2] <- p1*(log(x[,2]/(x[,1]^p4 * p2^p3)))
return(Z.av)
}