Exercise

Creating a scree plot

The scree plot is a visual representation of eigenvalues. Visual inspection of the scree plot is a quick and easy way to get a feel for the dimensionality of your dataset. Like the eigen() function in the previous exercise, the scree() function takes a correlation matrix as its argument. Eigenvalues can be generated from a principal component analysis or a factor analysis, and the scree() function calculates and plots both by default. Since eigen() finds eigenvalues via principal components analysis, we will use factors = FALSE so our scree plot will only display the values corresponding to those results.

Instructions

100 XP

Once again, calculate the correlation matrix.
Next, use that correlation matrix function to create a scree plot.