Data Science

using Query, Plots, StatsPlots, DataFrames, CSV, StatsBase, GR, RDatasets
using Tables, StructArrays, DataValues, CategoricalArrays, WeakRefStrings 
using StatsModels, Distributions, OffsetArrays, TableTraits

school = RDatasets.dataset("mlmRev","Hsb82")
@df school density(:MAch, group = (:Sx, :Sector), legend = :topleft)