Exercise

Do it all over again

Hopefully, by now, you've realized that the real benefit to writing functions is that you can reuse your code easily. Now you are going to rerun the whole analysis from this chapter on a new crop, barley. Since all the infrastructure is in place, that's less effort than it sounds!

Barley prefers a cooler climate compared to corn and wheat and is commonly grown in the US mountain states of Idaho and Montana.

dplyr and ggplot2, and mgcv are loaded; fortify_with_metric_units(), fortify_with_census_region(), plot_yield_vs_year_by_region(), run_gam_yield_vs_year_by_region(), and predict_yields() are available.

Instructions 1/3

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Fortify the barley data with metric units, then with census regions.