plotEdaVar: Plot the scree plot

In USGS-R/GcClust: Clustering geochemical data with HMC sampling

Plot the scree plot

Description

Plot the variances associated with the (robust) principal components.

Usage

plotEdaVar(transData, relOffset = 0.04, size = 3)

Arguments

transData	List containing the transformed geochemical concentrations and related information. This list is return by function transformGcData, for which the documentation includes a complete description of container transData.
relOffset	Scalar specifying the relative distance that each percentage of cumulative variance (see Details) is offset from the top of its respective bar.
size	Scalar specifying the text size for the percentage of cumulative variance (see Details).

Details

In principal component analysis, this plot is called a "scree plot."

The variance for each component is represented by a bar, and above each bar is the cumulative percentage of total variance. The total variance is the sum of the variances for each component. The percentage of variance associated a component is its variance divided by the total variance times 100. The cumulative percentage of total variance for component k is the sum of the percentages from component 1 to component k.

References

Johnson, R.A., and Wichern, D.W., 2007, Applied multivariate statistical analysis (6th ed.): Pearson Prentice Hall.

Examples

## Not run: 
plotEdaVar(transData)

## End(Not run)

USGS-R/GcClust documentation built on April 17, 2023, 8:08 p.m.