CDSS                    CDSS: Course dependent skill structures
cdss_attribution_function_sa
                        Build an attribution function from CDSS skill
                        assignment matrices.
cdss_attribution_function_sma
                        Build an attribution function from CDSS skill
                        multi-assignment matrices.
cdss_circular_requirements
                        Vector of learning objects requiring and
                        teaching the same skill
cdss_csma2sf            Derive a surmise function from a complete skill
                        multi-assignment
cdss_missing_los        Vector of skills without teaching learning
                        objects.
cdss_sa2sma             Convert skill assignment matrices to skill
                        multi-assignment
cdss_sa_compliance      Check whether a skill assignment is compliant
                        to the CDCS conditions.
cdss_sf2basis           Derive a basis from a surmise function
cdss_sma2csma           Complete a skill multi-assignment
cdss_tables2sa          Build matrices of taught and required,
                        respectively, skills for learning objects from
                        respective tables.
read_skill_assignment_csv
                        Read an assignment of taught and required
                        skills for a set of learning objects from
                        CSV-files.
read_skill_assignment_ods
                        Read an assignment of taught and required
                        skills for a set of learning objects from an
                        ODS-file.
read_skill_assignment_xlsx
                        Read an assignment of taught and required
                        skills for a set of learning objects from an
                        XLSX-file.
