This package provides tools for working with categorical variables, both with unordered (nominal variables) and ordered categories (ordinal variables). The package provides a replacement for DataArrays.jl’s
It offers better performance by getting rid of type instability thanks to the
Nullable type, which is used to represent missing data. It is also based on a simpler design by only supporting categorical data, which allows offering more specialized features (like ordering of categories). See the IndirectArrays.jl package for a simpler array type storing data with a small number of values.