Computes CLR transformation.
Usage
transform_clr(object, ...)
# S4 method for CompositionMatrix
transform_clr(object, weights = FALSE)
Arguments
- object
A
CompositionMatrix
object.- ...
Currently not used.
- weights
A
logical
scalar: sould a varying weight be used. IfFALSE
(the default), equally-weighted parts are used. Alternatively, a positivenumeric
vector of weights can be specified.
Value
A CLR
object.
Details
The CLR transformation computes the log of each part relative to the geometric mean of all parts.
References
Aitchison, J. (1986). The Statistical Analysis of Compositional Data. London: Chapman and Hall.
Greenacre, M. J. (2019). Compositional Data Analysis in Practice. Boca Raton: CRC Press.
Greenacre, M. J. (2021). Compositional Data Analysis. Annual Review of Statistics and Its Application, 8(1): 271-299. doi:10.1146/annurev-statistics-042720-124436 .
See also
Other log-ratio transformations:
transform_alr()
,
transform_ilr()
,
transform_inverse()
,
transform_lr()
,
transform_plr()
Examples
## Data from Aitchison 1986
data("hongite")
## Coerce to compositional data
coda <- as_composition(hongite)
## Centered log-ratio
clr <- transform_clr(coda)
## Inverse transformation
inv_clr <- transform_inverse(clr)
all.equal(coda, inv_clr)
#> [1] TRUE