Suggested answer to exercise: Variables from the 2005 M.Sc. Questionnaire, 5

Question 5: What measurement problem does self-reported alcohol consumption illustrate?

Suggested answer

The highest frequencies are 0 and 10 and there is also a clear peak at 20. The variable shows digit preference. For example, there are 16 tens, no nines but 6 eights, and one eleven but five twelves, showing a clear preference for ten.

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