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  3. Factor Analysis in R

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.