Exercise

Plotting yields over time by region

So far, you have a function to plot yields over time for each crop, and you've added a census_region column to the crop datasets. Now you are ready to look at how the yields change over time in each region of the USA.

ggplot2 is loaded. corn and wheat have been fortified with census regions. plot_yield_vs_year() is available.

Instructions 1/2

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Use the function you wrote to plot yield versus year for the corn dataset, then facet the plot, wrapped by census_region.