Scree Plots of PCA Results for a Spectra Object

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Description

Functions to draw a traditional scree plot or an alternative that is perhaps more useful. These illustrate the importance of the components in a PCA analysis.

Usage

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Arguments

pca

An object of class prcomp, modified to include a list element called $method, a character string describing the pre-processing carried out and the type of PCA performed (it appears on the plot). This is automatically provided if ChemoSpec functions c_pcaSpectra or r_pcaSpectra were used to create pca.

...

Additional parameters to be passed to plotting functions.

Details

If you add $method to the PCA results from other packages, this will plot a scree plot for any PCA results, not just those from Spectra objects.

Value

None. Side effect is a plot.

Author(s)

Bryan A. Hanson, DePauw University. hanson@depauw.edu

References

The idea for the alternative style plot came from the NIR-Quimiometria blog by jrcuesta, at http://nir-quimiometria.blogspot.com/2012/02/pca-for-nir-spectrapart-004-projections.html

https://github.com/bryanhanson/ChemoSpec

Examples

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data(metMUD1)
results <- c_pcaSpectra(metMUD1)
plotScree(results, main = "metMUD1 NMR Data")
plotScree2(results, main = "metMUD1 NMR Data")

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