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A dplyr Quiz

John Mount wants to know how well you understand dplyr:

dplyr is one of the most popular R packages. It is powerful and important. But is it in fact easily comprehensible?

dplyr makes sense to those of us who use it a lot. And we can teach part time R users a lot of the common good use patterns.

But, is it an easy task to study and characterize dplyr itself?

Take John’s quiz and find out.  He wasn’t kidding about it being an advanced quiz.