References
http://julia.readthedocs.io/en/latest/manual/
https://dataframesjl.readthedocs.io/en/latest/
https://github.com/JuliaStats/StatsBase.jl
http://dcjones.github.io/Gadfly.jl/
http://julia.readthedocs.io/en/latest/manual/
https://dataframesjl.readthedocs.io/en/latest/
https://github.com/JuliaStats/StatsBase.jl
http://dcjones.github.io/Gadfly.jl/