Exercise

Plotting yields over time

Now that the units have been dealt with, it's time to explore the datasets. An obvious question to ask about each crop is, "how do the yields change over time in each US state?" Let's draw a line plot to find out!

ggplot2 is loaded, and corn and wheat datasets are available with metric units.

Instructions 1/2

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Using the corn dataset, plot yield_kg_per_ha versus year. Add a line layer grouped by state and a smooth trend layer.