aovPCAloadings: Plot aovPCAscores Loadings of a Spectra Object

In ChemoSpec: Exploratory Chemometrics for Spectroscopy

Plot aovPCAscores Loadings of a Spectra Object

Description

Uses the results from aovPCAscores to plot the corresponding loadings.

Usage

aovPCAloadings(spectra, PCA, submat = 1, loads = 1, ref = 1, ...)

Arguments

spectra	An object of S3 class Spectra().
PCA	List of pca results created by aov_pcaSpectra.
submat	Integer. Selects list element submat from PCA which is a list of PCA results, each corresponding to the computation in aov_pcaSpectra.
loads	An integer vector giving the loadings to plot.
ref	An integer specifying the reference spectrum to plot, which appears at the bottom of the plot.
...	Parameters to be passed to the plotting routines. Applies to base graphics only.

Value

The returned value depends on the graphics option selected (see ChemoSpecUtils::GraphicsOptions()).

• base: None. Side effect is a plot.

• ggplot2: The plot is displayed, and a ggplot2 object is returned if the value is assigned. The plot can be modified in the usual ggplot2 manner.

Author(s)

Bryan A. Hanson (DePauw University), Matthew J. Keinsley.

References

Pinto, Bosc, Nocairi, Barros, and Rutledge. "Using ANOVA-PCA for Discriminant Analysis: ..." Analytica Chimica Acta 629.1-2 (2008): 47-55.

Harrington, Vieira, Espinoza, Nien, Romero, and Yergey. "Analysis of Variance–Principal Component Analysis: ..." Analytica Chimica Acta 544.1-2 (2005): 118-27.

See Also

An example using this function can be seen in aov_pcaSpectra. See also plotLoadings. Additional documentation at https://bryanhanson.github.io/ChemoSpec/

ChemoSpec documentation built on April 15, 2025, 5:09 p.m.