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Using ratios to describe the frequency of a name

In the video, you learned how to find the difference in the frequency of a baby name between consecutive years. What if instead of finding the difference, you wanted to find the ratio?

You'll start with the babynames_fraction data already, so that you can consider the popularity of each name within each year.

说明

100 XP
  • Arrange the data in ascending order of name and then year.
  • Group by name so that your mutate works within each name.
  • Add a column ratio containing the ratio (not difference) of fraction between each year.