An Errata for Martin Peterson, An Introduction to Decision Theory, Cambridge University Press, 2009

• Page 26. Last paragraph line 3. Exchange G = 10 · H + 10 for H = 10 · G + 10.
• Page 27. Line 5. The constant m can be positive or negative.
• Page 30. Lines 7–8. a2 should be deleted from all three sets.
• Page 39. Solution to exercise 2.11. Exchange (5) for (4) throughout.
• Page 42. In the definitions of Weak and Strong Dominance, exchange if and only if for if.
• Page 51. The definition of Minimax regret should read:
• a1a2 if and only if min{(v(a1,s1) − max(s1)), (v(a1,s2) − max(s2)), …} > min{(v(a2,s1) − max(s1)), (v(a2,s2) − max(s2)), …}
• Page 59. In row 4 (continuity) last column (insufficient reason) exchange for ×.
• Page 62. The solution to 3.5. In the top row of the last column exchange 1 for 0.
• Page 82. The equations before the last paragraph should be:
• eu(G1) − eu(G2) = (30/90)M − (B/90)M = (30 − B)M/90
• eu(G3) − eu(G4) = ((30 + 60 − B)/90)M − (60/90)M = (30 − B)M/90
• Page 85. In the definition of Gamble 1 exchange min for max.
• Page 104. Equation (i). Exchange Ford for Jaguar and Jaguar for Ford.
• Page 105. Last line. The utility of the Saab should be 0.55 + 0.36 = 0.91.
• Page 115. Solution to 5.6. Line 2 should read “…xy implies that xz or zy. The second possibility, zy, is inconsistent with what we initially supposed”. In the solution to 5.7 all that can be concluded is that 0.9B + 0.1C = 0.6B + 0.4D.
• Page 128. Second paragraph line 9. Exchange biased for not biased.
• Page 132. In the solution to exercise 6.6, part (a), delete 1/6 · 1/6 (the answer, 6/36, is still correct). The solution to problem 6.7 should be 10/37 ≈ 0.27. In the solution to exercise 6.8 exchange 0.53 for 0.552.
• Page 157. In line 8, exchange p(x) > 0 for p(x) < 0 and in line 18, p(x ∨ ¬x) > 1 for p(x ∨ ¬x) < 1. In the last paragraph line 4 the last x' should be in italic typeface and in line 5, exchange y for x'.
• Page 168. Proof of Theorem 8.1. The third line, should read ”between x and y at…”.
• Page 168. Main text, line 1. Exchange regard x and y for regard x and z.
• Page 168. Main text, line 2. Exchange y health for z health.
• Page 179. Line 5. Exchange xpy for xpz.
• Page 186. In line 2, x-3/2 divided by x-1/2 should be x-1, not x-3. In line 4, x-5/3 divided by x-2/3 should be x-1, not x-10/3.
• Page 189. The expected utility for taking boxes 1 and 2 is \$11,000, not \$10,000 (because u(\$0) should be u(\$1000)).
• Page 194. Second paragraph. Exchange all X for Y and all Y for X.
• Page 262. Solution to 12.8. (R2, C1) is also a Nash equilibrium.
• Page 267. Lines 2–3. Exchange O were to prefer f to e for Q were to prefer b to a.
• Page 282. Exercise 13.1 line 2. Delete or f.
• Page 284. Exercise 13.5(b). The answer is correct, but No should be deleted.
• Page 286. Line 12. C and D have been reversed in the definition of the lotteries.
• Page 308. Entry Herodotus (1954). Exchange Penquin for Penguin.