Portal Data dplyr Review (dplyr)
If surveys.csv, species.csv, and plots.csv are not available in your workspace download them:
Load them into R using read.csv().
We want to do an analysis comparing the size of individuals on the Control
plots to the Long-term Krat Exclosures. Create a data frame with the
year, genus, species, weight and plot_type for all cases where the
plot type is either Control or Long-term Krat Exclosure. Only include
cases where Taxa is Rodent. Remove any records where the weight is
missing.