TT.chemometrics.alr: Compute the additive log-ratio transformation of...
In soiltexture: Functions for Soil Texture Plot, Classification and Transformation
TT.chemometrics.alr R Documentation
Compute the additive log-ratio transformation of compositional data.
Description
Function that compute the additive log-ratio transformation of compositional
data (here texture data). This a a copy-paste-and-rename of the alr function
provided by the package chemometrics: P. Filzmoser and K. Varmuza (2008).
chemometrics: Multivariate Statistical Analysis in Chemometrics. R package
version 0.4. The function has been modified so it returns NA when a value is
below or equal to zero (this happens when using a regular grid of texture
data, for practical reasons). The function has also been modified so it uses
column name rather than column index.
Usage
TT.chemometrics.alr(X, divisorvar, css.names)
Arguments
X
A data.frame containing soil texture data
divisorvar
number of ratioing variable
css.names
See TT.plot
Author(s)
Julien Moeys [aut, cre], Wei Shangguan [ctb], Rainer Petzold [ctb],
Budiman Minasny [ctb], Bogdan Rosca [ctb], Nic Jelinski [ctb], Wiktor
Zelazny [ctb], Rodolfo Marcondes Silva Souza [ctb], Jose Lucas Safanelli
[ctb], Alexandre ten Caten [ctb]
soiltexture documentation built on May 29, 2024, 7:53 a.m.
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| TT.chemometrics.alr | R Documentation |
Compute the additive log-ratio transformation of compositional data.
Description
Function that compute the additive log-ratio transformation of compositional data (here texture data). This a a copy-paste-and-rename of the alr function provided by the package chemometrics: P. Filzmoser and K. Varmuza (2008). chemometrics: Multivariate Statistical Analysis in Chemometrics. R package version 0.4. The function has been modified so it returns NA when a value is below or equal to zero (this happens when using a regular grid of texture data, for practical reasons). The function has also been modified so it uses column name rather than column index.
Usage
TT.chemometrics.alr(X, divisorvar, css.names)
Arguments
X |
A data.frame containing soil texture data |
divisorvar |
number of ratioing variable |
css.names |
See |
Author(s)
Julien Moeys [aut, cre], Wei Shangguan [ctb], Rainer Petzold [ctb], Budiman Minasny [ctb], Bogdan Rosca [ctb], Nic Jelinski [ctb], Wiktor Zelazny [ctb], Rodolfo Marcondes Silva Souza [ctb], Jose Lucas Safanelli [ctb], Alexandre ten Caten [ctb]
R Package Documentation
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We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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