ratioLoadings: Loadings of relations of two amounts

Description Usage Arguments Details Value Author(s) See Also Examples

Description

In a compositional dataset the relation of two objects can be interpreted safer than a single amount. These functions compute, display and plot the corresponding pair-information for the various principal component analysis results.

Usage

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relativeLoadings(x,...)
## S3 method for class 'princomp.acomp'
relativeLoadings(x,...,log=FALSE,scale.sdev=NA,
                                                  cutoff=0.1)
## S3 method for class 'princomp.aplus'
relativeLoadings(x,...,log=FALSE,scale.sdev=NA,
                                                  cutoff=0.1)
## S3 method for class 'princomp.rcomp'
relativeLoadings(x,...,scale.sdev=NA,
                                                  cutoff=0.1)
## S3 method for class 'princomp.rplus'
relativeLoadings(x,...,scale.sdev=NA,
                                                  cutoff=0.1)
## S3 method for class 'relativeLoadings.princomp.acomp'
print(x,...,cutoff=attr(x,"cutoff"),
                                                  digits=2)
## S3 method for class 'relativeLoadings.princomp.aplus'
print(x,...,cutoff=attr(x,"cutoff"),
                                                 digits=2)
## S3 method for class 'relativeLoadings.princomp.rcomp'
print(x,...,cutoff=attr(x,"cutoff"),
                                                 digits=2)
## S3 method for class 'relativeLoadings.princomp.rplus'
print(x,...,cutoff=attr(x,"cutoff"),
                                                 digits=2)
## S3 method for class 'relativeLoadings.princomp.acomp'
plot(x,...)
## S3 method for class 'relativeLoadings.princomp.aplus'
plot(x,...)
## S3 method for class 'relativeLoadings.princomp.rcomp'
plot(x,...)
## S3 method for class 'relativeLoadings.princomp.rplus'
plot(x,...)

Arguments

x

a result from an amount PCA princomp.acomp/princomp.aplus/princomp.rcomp/princomp.rplus

log

a logical indicating to use log-ratios instead of ratios

scale.sdev

if not NA, a number specifying the multiple of a standard deviation, used to scale the components

cutoff

a single number. Changes under that (log)-cutoff are not displayed

digits

the number of digits to be displayed

...

further parameters to internally-called functions

Details

The relative loadings of components allow a direct interpretation of the effects of principal components. For acomp/aplus classes the relation is induced by a ratio, which can optionally be log-transformed. For the rcomp/rplus-classes the relation is induced by a difference, which is meaningless when the units are different.

Value

The value is a matrix of type "relativeLoadings.princomp.*", containing the ratios in the compositions represented by the loadings (optionally scaled by the standard deviation of the components and scale.sdev).

Author(s)

K.Gerald v.d. Boogaart http://www.stat.boogaart.de

See Also

princomp.acomp, princomp.aplus, princomp.rcomp, princomp.rplus, barplot

Examples

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compositions documentation built on June 14, 2018, 5:03 p.m.