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1 ¹ Venture Beat. “87% of data science projects failing”: venturebeat.com/2019/07/19/why-do-87-of-data-science-projects-never-make-it-into-production

2 ² www.brookings.edu/wp-content/uploads/2016/06/11_origins_crisis_baily_litan.pdf

3 ³ Nate Silver wrote a series of articles describing this in great detail ( fivethirtyeight.com/tag/the-real-story-of-2016 ). Pollsters wrongly assuming independence, just like in the mortgage crisis, was one mistake.

4 ⁴ Note to our fellow statisticians: We just mean regular confidence, not statistical confidence.

5 ⁵ K-nearest-neighbor can also be used to predict numbers instead of classes. These are called regression problems, and we'll cover them later in the book.

6 ⁶ This idea is discussed in an amazingly helpful book: Wilson, G. (2019). Teaching tech together. CRC Press.