Like Goes with Like: The Role of Representativeness in Erroneous and Pseudo-Scientific Beliefs
The representativeness heuristic is a cognitive bias where people judge the probability of an event by how similar it is to a typical case, leading to errors like ignoring base rates and false pattern recognition.
THE IDEA
The representativeness heuristic is a mental shortcut where individuals evaluate the likelihood of an event by comparing it to an existing prototype in their minds. This often results in systematic errors, such as neglecting base rates or seeing patterns where none exist. The classic work by Tversky and Kahneman (1974) introduced this concept, and research by Gilovich, Vallone, and Tversky (1985) used it to interpret basketball fans’ beliefs about the hot hand. That historical interpretation does not establish that all shot outcomes are independent. The tendency for 'like to go with like' can lead to pseudo-scientific beliefs and erroneous judgments, as people rely on resemblance rather than statistical evidence.
When to use it
Predicting job performance based on a brief impression of a candidate's appearance or mannerisms.
Evaluating the likelihood of a medical diagnosis when symptoms closely match a typical case, without considering the disease's prevalence.
Assessing the probability of a specific outcome in sports or gambling, such as expecting a 'hot' player to continue scoring.
Making investment decisions based on a company's similarity to past successful companies, ignoring market conditions.
FROM THEORY TO EVERYDAY LIFE
In practice
Librarian or Farmer?
In a population where farmers greatly outnumber librarians, a shy, detail-oriented description may lead someone to choose librarian because it fits a stereotype. Ignoring the relative numbers leaves out relevant evidence.
The Hot Hand Fallacy
A fan assumes that a recent streak alone proves a player is more likely to score next. If the shot outcomes are independent, that inference fails. Whether they are independent must be examined rather than assumed.
A MOMENT TO REFLECT
Put it to work.
Can you recall a time when you assumed something was true because it seemed representative, ignoring statistical evidence?
How might the representativeness heuristic lead to stereotyping or prejudice?
What strategies can you use to avoid over-relying on representativeness in your decisions?
Often confused with
References
- Like Goes with Like: The Role of Representativeness in Erroneous and Pseudo-Scientific Beliefs — Gilovich, T., Vallone, R., & Tversky, A.
- Judgment under Uncertainty: Heuristics and Biases — Tversky, A., & Kahneman, D. (1974)
CONTINUE THE CONVERSATION
Source texts
- Heuristics and Biases The Psychology of Intuitive Judgment (Thomas Gilovich, Dale Griffin, Daniel Kahneman)