Spurious relationship

In statistics, a spurious relationship (or, sometimes, spurious correlation) is a mathematical relationship in which two occurrences have no logical connection, yet it may be implied that they do, due to a certain third, unseen factor (referred to as a "confounding factor" or "lurking variable"). The spurious relationship gives an impression of a worthy link between two groups that is invalid when objectively examined.

General example

An example of a spurious relationship can be illuminated examining a city's ice cream sales. These sales are highest when the city's rate of drownings is highest. To allege that ice cream sales cause drowning would be to imply a spurious relationship between the two. In reality, a heat wave may have caused both. The heat wave is an example of a hidden or unseen variable.

Related Topics:
Ice cream - Heat wave

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