introduction to DataFrames.jl in Julia
pertains to DataFrames.jl v1.2.2. using Pluto.jl in Julia.
to follow along:
skeleton Pluto notebook here: https://github.com/SimonEnsemble/CHE-...
completed Pluto notebook here: https://github.com/SimonEnsemble/CHE-...
the `income.csv` file is here: https://github.com/SimonEnsemble/CHE-...