Exception fallacy

Example

A first class passenger on a train is arrogant and rude to a person who walks into the first class compartment. The person concludes that all first class passengers are arrogant.

A person in France is helped by a policeman there. They assume all French police are helpful.

A teacher finds that a few students from a particular part of town are difficult. They conclude that that part of town is rough.

Discussion

We are always in a hurry to classify people and groups and, when we have limited data about a group, we will often use what information we have, even if it is not statistically valid -- and even if it is a single data point.

This data may well be the exception rather than the rule - hence the name of the fallacy.

This effect is particularly common when several factors are taken into account:

A person is encountered who does not fit into current categories, for example where there is a dominant attribute for which there is no stereotype available.

Other attributes are available and can be evaluated.

Other people who have similar dominant attributes are not available to determine whether additional attributes correlate. Thus the evaluation cannot be disconfirmed.

This fallacy is an effective reversal of the Ecological fallacy.

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Exception fallacy

Description

Example

Discussion

Classification

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