This is a follow-up to Shrub Volume Data Basics.
Dr. Granger wants some summary data of the plants at her sites and for her experiments. Make sure you have her shrub dimensions data.
This code calculates the average height of a plant at each site:
by_site <- group_by(shrub_dims, site)
avg_height <- summarize(by_site, avg_height = mean(height))
max() to determine the maximum height of a plant at each site.