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Replace variance and relative variation exercises #30

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michaellevy opened this issue Dec 15, 2016 · 1 comment
Open

Replace variance and relative variation exercises #30

michaellevy opened this issue Dec 15, 2016 · 1 comment

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@michaellevy
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Variance is tricky for some learners, and the wide -> long exercise is too contrived.
@michaellevy
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dplyr and tidyr

@michaellevy michaellevy mentioned this issue Dec 16, 2016
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