Abstract
The ecological fallacy is a common and little understood error in the interpretation of statistical data wherein inferences about individuals are based on the aggregate of the group from which they belong. This opinion piece overviews the importance of avoiding the error and illustrates the ease with which mistakes in inference can be made by examining some papers appearing in recent conferences and journals, and by demonstrating with artificial data representing Hofstede's cultural dimensions. It concludes with an appeal for caution when considering the combination of aggregate data with our surveys of individuals.
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