# Ignoring base rates. Ignoring base rates (cont.) Improving our judgments. Base Rate Neglect. When Base Rate Matters. Probabilities vs.

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1 Ignoring base rates People were told that they would be reading descriptions of a group that had 30 engineers and 70 lawyers. People had to judge whether each description was of an engineer or a lawyer. They gave a number that reflected their confidence in their judgement. They should have factored in the base rate: the overall likelihood that a given case will fall in a given category Ignoring base rates (cont.) If the description matched people s stereotype of an engineer, they judged that the description was of an engineer People s judgments were not influenced by different base rate information (70 engineers and 30 lawyers vs. 70 lawyers and 30 engineers) Improving our judgments People are more likely to use statistical knowledge when it is triggered by the situation. When people had to judge descriptions as belonging to a lawyer vs. engineer, they did better when they drew the descriptions out of a jar -- they made use of base rate information Highlighting the role of chance improves judgment. Base Rate Neglect 85% cabs green 15% cabs are blue Witness: Cab was blue. Witness: 80% accurate when identifying colors in similar conditions What s the probability that the cab in the accident was blue? Survey Says: 80% Bayes Says: 41% When Base Rate Matters 85% of accidents involve green cabs 15% of accidents involve blue cabs Witness: Cab was blue. Witness: 80% accurate when ID-ing colors What s the probability the cab was blue? Survey says: 60% Bayes (still) says: 41% Causal scenarios make base rates relevant Probabilities vs. Frequencies The probability of breast cancer is 1% for a woman at age 40 who participates in routine screening. If a woman has breast cancer, the probability is 80% that she will get a positive mammography. If a woman does not have breast cancer, the probability is 9.6% that she will get a positive mammography. A woman in this age group had a positive mammography in a routine screening. What is the probability that she actually has breast cancer? 1

2 Frequency & Probability Formats for a Bayesian Inference Problem Three Major Heuristics/Biases (Tversky and Kahneman, 1974) Representativeness The more object X is similar to class Y, the more likely we think X belongs to Y Availability The easier it is to consider instances of class Y, the more frequent we think it is Anchoring Initial estimated values affect the final estimates, even after considerable adjustments The Representativeness Heuristic We often judge whether object X belongs to class Y by how representative X is of class Y For example, people order the potential occupations by probability and by similarity in exactly the same way The problem is that similarity produces multiple biases Representative Bias (1): Insensitivity to Prior Probabilities The base rate of outcomes should be a major factor in estimating their frequency However, people often ignore it (e.g., there are more farmers than librarians) Representative Bias (2): Insensitivity to Sample Size The size of a sample withdrawn from a population should greatly affect the likelihood of obtaining certain results in it People, however, ignore sample size and only use the superficial similarity measures For example, people ignore the fact that larger samples are less likely to deviate from the mean than smaller samples Representative Bias (3): Misconceptions of Chance Random patterns appear nonrandom & people may inappropriately attribute a cause for the apparent pattern People expect random sequences to be representatively random even locally E.g., they consider a coin-toss run of HTHTTH to be more likely than HHHTTT or HHHHTH Gambler s Fallacy idea that prior outcomes can influence an independent probabilistic event After a run of reds in a roulette, black will make the overall run more representative (chance as a selfcorrecting process??) 2

3 Representative Bias (4): Insensitivity to Predictability People predict future performance mainly by similarity of description to future results For example, predicting future performance as a teacher based on a single practice lesson Evaluation percentiles (of the quality of the lesson) were identical to predicted percentiles of 5-year future standings as teachers The urge to find order in the environment appears to be a rather deep-seated human drive. Herb Simon Conjunction Fallacy Use of representativeness heuristic: we think that people who exhibit certain characteristics will exhibit other, related characteristics we think that like goes with like Example: People were told that Linda majored in philosophy and was a social activist. Then they ranked the probability of 8 statements about Linda. Linda is a bank teller Linda is a bank teller and a feminist Conjunction Fallacy 80% of people rated the statement Linda is a bank teller and a feminist as more likely than Linda is a bank teller This contradicts the fact that the probability of x is greater than the probability of x and y co-occurring (when x and y are independent events) When this is pointed out to people, they admit they have made an error The Availability Heuristic The frequency of a class or event is often assessed by the ease with which instances of it can be brought to mind The problem is that this mental availability might be affected by factors other than the frequency of the class Availability Biases (1): Ease of Retrievability Classes whose instances are more easily retrievable will seem larger For example, judging if a list of names had more men or women depends on the relative frequency of famous names Salience affects retrievability E.g., watching a car accident increases subjective assessment of traffic accidents 3

4 Availability Biases (2): Effectiveness of a Search Set We often form mental search sets to estimate how frequent are members of some class But, effectiveness of search set might not relate directly to the class frequency Which is more prevalent: Words that start with r or words where r is the 3 rd letter? Are abstract words such as love more frequent than concrete words such as door? Availability Biases (3): Ease of Imaginability Instances often need to be constructed on the fly using some rule; the difficulty of imagining instances is used as an estimate of their frequency Imaginability might cause overestimation of likelihood of vivid scenarios, and underestimation of the likelihood of difficult-to-imagine ones Availability Biases (4): Illusory Correlation A Trip to the Airport People tended to overestimate cooccurrence of diagnoses such as paranoia or suspiciousness with features in persons drawn by hypothetical mental patients, such as peculiar eyes Subjects might overestimate the correlation due to easier association of suspicion with the eyes than other body parts Relativity of Judgment & Use of Norms John vs. Jill John can imagine more similar possible worlds where he makes his flight Judgments based on comparisons of alternative possible worlds Judgments reflect mutability Atypical > Typical Foreground > Background The Anchoring and Adjustment Heuristic People often estimate by adjusting an initial value until a final value is reached Initial values might be due to the problem presentation or due to partial computations Adjustments are typically insufficient and are biased towards initial values, the anchor 4

6 Abandon goal of making optimal choice in favor of one that is satisfactory Search alternatives until you find a satisfactory one Satisficing Dealing with Complexity Elimination of Aspects Pick aspect and threshold Eliminate sub-threshold members Pick next aspect and threshold Eliminate sub-threshold members (Rinse & Repeat) Elimination of Aspects Adaptive Decision Making Apt A Apt B Noisiness Cleanliness Distance Rent Low Fair 20 min \$410 High Good 30 min \$570 Payne and colleagues Simulations Expected Utility Tanks under pressure Satisficing Elimination of Aspects Performed well under time pressure! Experiments Little time pressure: attempt to use optimal strategies Lots of time pressure: use heuristics Decision Making Expected Value Theory does not capture subjective value of many goods Expected Utility Theory does not capture subjective understanding of probability People often use heuristics to make decisions Anchoring & Adjustment Availability Representativeness Use of heuristics can lead to biases & fallacies A&A Insufficient Adjustment Availability Hindsight Bias Representativeness Conjunction Fallacy, Gambler s Fallacy 6

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