Greenacre's power transformation.
green(x, theta)
A matrix with the compositional data.
The value of the power transformation, it has to be between -1 and 1. If zero values are present it has to
be greater than 0. If
A matrix with the power transformed data.
Greenacre's transformation is applied to the compositional data.
Greenacre, M. (2009). Power transformations in correspondence analysis. Computational Statistics & Data Analysis, 53(8): 3107-3116. http://www.econ.upf.edu/~michael/work/PowerCA.pdf
# NOT RUN {
library(MASS)
x <- as.matrix(fgl[, 2:9])
x <- x / rowSums(x)
y1 <- green(x, 0.1)
y2 <- green(x, 0.2)
rbind( colMeans(y1), colMeans(y2) )
# }
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