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Which of the following is the most common problem with messy data?

(a) Column headers are values

(b) Variables are stored in both rows and columns

(c) A single observational unit is stored in multiple tables

(d) All of the mentioned

The question was asked in my homework.

Question is taken from Tidy Data in section Getting Data of Data Science

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Right answer is (d) All of the mentioned

To explain I would say: Real datasets can, and often do, violate the three precepts of tidy data in almost every way imaginable.

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