Errata if you purchased between November 7, 2019 and November 27, 2019 (the fourth printing):

Page 21; Exercise 1.12: Replace 12% by 12.5% (This was kindly pointed out by Emilio Barone)

Page 41: 10-11 lines from end: replace “five” by “four” in two places (This was kindly pointed out by Emilio Barone)

Page 75: line 2: Replace “training set” with “test set” (This was kindly pointed out by Emilio Barone)

Page 95: six lines from end: replace 698.18 by 696.19 and 31.28 by 31.29 (This was kindly pointed out by Emilio Barone)

Page 96: 10 lines from end: replace “unconditional” by “conditional” (This was kindly pointed out by Emilio Barone)

Page 99: Figure 4.4: replace $353,593 by $353,573 (This was kindly pointed out by Emilio Barone)

Page 112: footnote 2: Replace by (This was kindly pointed out by Emilio Barone)

Page 128: equation (6.2): insert a minus sign in front of the expression. Also the expression for the gradient in the final line of footnote 3 should be (E⁺−E^-)/0.02 (This was kindly pointed out by Emilio Barone)

Page 141: equation for should have a minus sign in front of right hand side (This was kindly pointed out by Emilio Barone)

Page 172: Answer to 1.11: the standard deviation of the errors for the training set are correct, but those for the test set are wrong. They should be 35,588 for the polynomial of degree 3 model and 37,427 for the polynomial of degree four model. (This was kindly pointed out by Silvio Bencini