Internal function that translates the types passed to ``callMDI`` into the outlier component type vector.
setupOutlierComponents(types)
Vector of numbers to pass to the C++ MDI function indicating what outlier component types should be used. 0, the default, means no outliers are modelled, 1 uses a global MVT distribution to model outliers a la Crook et al.
Density types passed to ``callMDI``.