Miami 2021.RData is actually a set of dataframes, all about the tracts in Miami in 2021.  Each dataframe (e.g. "ethnoracial") contains many different descriptors of each census tract.  This gives us the ability to move beyond just describing one quality at a time and explore who two or more qualities coincide.  Are rich neighborhoods cleaner?  Do police more regularly patrol areas with proportionally large youth populations? In neighborhoods with more coffee shops do passersby more often greet one another?  All of these questions ask about the co-occurence of two things.