I started reading The Elements of Statistical Learning by Hastie, Tibshirani, and Friedman, and was curious about how to reproduce Figure 2.5. (The book is made available as a free and legal pdf here.)
So I figured out how to produce similar figures using Mathematica. I assume that this is also fairly straightforward to do in R, but I donâ€™t yet know enough R.
The authors explain the sampling method on pages 16 and 17.

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