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Published on Nov 21, 2015
Lecture 17 (or Sec 2 lesson 13) from "Introduction to Data Science" by Nina Zumel and John Mount (Copyright Nina Zumel and John Mount, authorized upload by the authors).
We are sharing this lesson and think it will be of particular interest to people working through our book Practical Data Science with R (Manning 2014, http://www.practicaldatascience.com/ ), which didn't get to cover GBM methods.