Add base interface
Introduce DataTypeWithRatioScale
Provide additional methods for DataTypeWithRatioScale
Add further methods to DataTypeWithRatioScale
Add method ratio() to DataTypeWithRatioScale
Add methods to DataTypeWithRatioScale
Intermediate commit
Initial version of grouping based hierarchy builders
Further implement hierarchy builders
Add example for LDL cholesterol
Print more data
Fix bug and format code
Implement load/store for hierarchy builders
Rename methods
Fix bugs in interval-based builder
Organize imports
Commit
Add todo
Work on hierarchy builders