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Data Analytics Workouts: Charting Correlation Matrices in R

I noticed this very simple, very powerful article by James Marquez,

Seven Easy Graphs to Visualize Correlation Matrices in R, in the Google+ community,

R Programming for Data Analysis, so thought to give it a try, since I started some of my current analyses a decade ago by generating correlation matrices in Excel, which I've sometimes redone and improved in R.

Charting Correlation Matrices in R