Idiosyncratic variation is variation in responses to questions caused by individuals' reactions to particular words or ideas in the question instead of by variation in the concept that the question is intended to measure.

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Idiosyncratic variation refers to variation in responses that is caused by individuals' unique reactions to certain words or ideas within a question, rather than by variation in the concept being measured by the question itself. This means that different people may interpret the same question in different ways, leading to variation in their responses.

Idiosyncratic Variation Is Variation in Responses to Questions Caused by Individuals