Decision Making Models
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1 Decision Making Models Prof. Yongwon Seo College of Business Administration, CAU
2 Decision Theory Decision theory problems are characterized by the following: A list of alternatives. A list of possible future states of nature. Payoffs associated with each alternative/state of nature combination. Two categories of decision situations: Probabilities can be assigned to future occurrences Probabilities cannot be assigned to future occurrences Decision making criteria 2
3 Components of Decision Making A state of nature is an actual event that may occur in the future. A payoff table is a means of organizing a decision situation, presenting the payoffs from different decisions given the various states of nature. 3
4 Decision Making Models DECISION MAKING WITHOUT PROBABILITIES 4
5 5 [Ex1] Real Estate Investments : Decision Making Without Probabilities
6 Alternatives and States of Nature List of Alternatives : Sometimes Do-nothing should be considered Suppose that a real estate investor must decide on a plan for purchasing a certain piece of property. After careful consideration, the investor has ruled out do nothing and is left with the following list of acceptable alternatives: 1. Apartment building 2. Office building 3. Warehouse States of nature : possible future conditions (events) Suppose that the profitability of the investment is influenced by the future economic conditions. The investor views the possibilities as 1. Good economic conditions 2. Poor economic conditions 6
7 Payoff table Payoff Table Decision Making Criteria maximax, maximin, minimax minimax regret, Hurwicz, equal likelihood 7
8 Maximax Criterion In the maximax criterion the decision maker selects the decision that will result in the maximum of maximum payoffs ; an optimistic criterion. 8
9 Maximin Criterion In the maximin criterion the decision maker selects the decision that will reflect the maximum of the minimum payoffs; a pessimistic criterion. 9
10 Minimax Regret Criterion Original Payoff Table Regret is the difference between the payoff from the best decision and all other decision payoffs. An approach that takes all payoffs into account. Regret Table 10
11 Minimax Regret Criterion (cont) The manager calculates regrets for all alternatives under each state of nature. Then the manager identifies the maximum regret for each alternative. Finally, the manager attempts to avoid regret by selecting the decision alternative that minimizes the maximum regret. 11
12 Hurwicz Criterion The approach offers the decision maker a compromise between the maximax and the maximin criteria. Requires the decision maker to specify a degree of optimism, in the form of a coefficient of optimism α, with possible values of α ranging from 0 to The closer the selected value of α is to 1.00, the more optimistic the decision maker is, and the closer the value of α is to 0, the more pessimistic the decision maker is. Criteria: α(best Payoff) + (1-α)(Worst Payoff) α=0 : equivalent to maximin α=1 : equivalent to maximax 12
13 Hurwicz Criterion (cont) The Hurwicz criterion is a compromise between the maximax and maximin criteria. A coefficient of optimism,, is a measure of the decision maker s optimism. The Hurwicz criterion multiplies the best payoff by and the worst payoff by 1-, for each decision, and the best result is selected. Here, = 0.4. Decision Values Apartment building $50,000(.4) + 30,000(.6) = 38,000 Office building $100,000(.4) - 40,000(.6) = 16,000 Warehouse $30,000(.4) + 10,000(.6) = 18,000 13
14 Equal Likelihood Criterion The equal likelihood ( or Laplace) criterion multiplies the decision payoff for each state of nature by an equal weight, thus assuming that the states of nature are equally likely to occur. Decision Values Apartment building $50,000(.5) + 30,000(.5) = 40,000 Office building $100,000(.5) - 40,000(.5) = 30,000 Warehouse $30,000(.5) + 10,000(.5) = 20,000 14
15 Summary of Criteria Results A dominant decision is one that has a better payoff than another decision under each state of nature. The appropriate criterion is dependent on the risk personality and philosophy of the decision maker. Criterion Maximax Maximin Minimax regret Hurwicz Equal likelihood Decision (Purchase) Office building Apartment building Apartment building Apartment building Apartment building 15
16 Decision Making Models DECISION MAKING WITH PROBABILITIES 16
17 Decision Making with Probabilities Decision making under partial uncertainty Distinguished by the present of probabilities for the occurrence of the various states of nature under partial uncertainty. The term risk is often used in conjunction with partial uncertainty. Sources of probabilities Subjective estimates Expert opinions Historical frequencies 17
18 Expected Value (EV) Expected value (EV) is computed by multiplying each decision outcome under each state of nature by the probability of its occurrence. 18
19 Expected Opportunity Loss (EOL) The Expected Opportunity Loss (EOL) is the expected value of the regret for each decision. The alternative with the smallest expected loss is selected as the best choice. 19
20 Expected Value of Perfect Information The expected value of perfect information (EVPI) is the maximum amount a decision maker would pay for additional information. upper bound of money to spend to obtain perfect information EVPI equals the expected value given perfect information(epc: Expected Payoff under Certainty) minus the expected value without perfect information(ev) for the best decision. EPC = 0.6 * 100, * 30,000 = 72,000 EVPI = EPC EV(best) = 72,000 44,000 = 28,000 EVPI always equals the expected opportunity loss (EOL) for the best decision. EVPI = EOL(best) EOL : loss due to imperfect info. 20
21 Decision Making Models DECISION TREE 21
22 Decision Tree Format Decision trees are used by decision makers to obtain a visual portrayal of decision alternatives and their possible consequences. : Decision Node Branches from : alternatives : Event (Chance, Probability) Node Branches from : possible futures with corresponding probabilities
23 23 Decision Tree: Example
24 24 Decision Tree: Example (cont)
25 EV in Decision Trees EV 2 = $42,000 The expected value is computed at each probability node: EV(node 2) =.60($50,000) +.40(30,000) = $42,000 EV(node 3) =.60($100,000) +.40(-40,000) = $44,000 EV(node 4) =.60($30,000) +.40(10,000) = $22,000 EV 3 = $44,000 EV 4 = $22,000 EV 2 = $42,000 Branches with the greatest expected value are selected. Office building is selected as the best decision EV=$44,000 EV 3 = $44,000 EV 4 = $22,000 25
26 Decision Tree: Sequential Decision Example A sequential decision tree is used to illustrate a situation requiring a series of decisions. Used where a payoff table, limited to a single decision, cannot be used. The next slide shows the real estate investment example modified to encompass a ten-year period in which several decisions must be made. 26
27 27 Sequential Decision Tree Example
28 Sequential Decision Tree Example $1,290,000 $2,540,000 $1,390,000 28
29 Sequential Decision Tree Example $1,290,000 $2,540,000 $1,740,000 $1,390,000 $790,000 29
30 Sequential Decision Tree Example $1,290,000 $1,360,000 30
31 Sequential Decision Tree Example $1,290,000 $1,160,000 $1,360,000 31
32 32 Best Strategy
33 Decision Analysis with Additional Information : Bayesian Analysis Bayesian analysis uses additional information to alter the marginal probability of the occurrence of an event. In the real estate investment example, using the expected value criterion, the best decision was to purchase the office building with an expected value of $44,000, and EVPI of $28,
34 Decision Analysis with Additional Information : Bayesian Analysis (cont) A conditional probability is the probability that an event will occur given that another event has already occurred. An economic analysis may provide additional information for future economic conditions. The conditional probabilities are known as follows: g = good economic conditions, P = positive economic report, p = poor economic conditions N = negative economic report P(P g) =.80 P(N g) =.20 P(P p) =.10 P(N p) =.90 Prior probabilities for good or poor economic conditions in the real estate decision: P(g) =.60; P(p) =.40 34
35 Decision Trees with Posterior Probabilities A posterior probability is the altered marginal probability of an event based on additional information. Posterior probabilities by Bayes rule: P(g P) = P(P g)p(g)/[p(p g)p(g) + P(P p)p(p)] = (.80)(.60)/[(.80)(.60) + (.10)(.40)] =.923 Posterior (revised) probabilities for decision: P(g P) =.923 P(p P) =.077 P(g N) =.250 P(p N) =.750 P P = P P g + P P p = P P g P g + P P p P p = = 0.52 P N = P N g + P N p = P N g P g + P N p P p = =
36 Decision Tree with Posterior Probabilities Good Econ. Poor Econ. Good Econ. Poor Econ. Good Econ. Poor Econ. Good Econ. Poor Econ. Good Econ. Poor Econ. Good Econ. Poor Econ. 36
37 Decision Trees with Posterior Probabilities What is your best strategy? 37
38 EV for simple option vs. strategic decision EV for simple option vs. strategic decision Without sample information, EV(best) is achieved with office EV(office) = $100,000(.6) - 40,000(.4) = $44,000 With sample information, EV(if P office, if N apartment) = $89,220(.52) + 35,000(.48) = $63,194 The expected value of sample information (EVSI) is the difference between the expected value with and without information: EVSI = $63,194-44,000 = $19,194 The efficiency of sample information is the ratio of the expected value of sample information to the expected value of perfect information: efficiency = EVSI /EVPI = $19,194/ 28,000 =.68 38
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