sdtm_relrec.RdRelated Records data frame - One record per related record, group of records or datasets
sdtm_relreca data frame with 234 rows and 7 columns. See https://github.com/SafetyGraphics/safetyData/blob/main/data-raw/sdtm/README.md for more details and full data specification. Columns:
 STUDYID text - Study Identifier
 RDOMAIN text - Related Domain Abbreviation
 USUBJID text - Unique Subject Identifier
 IDVAR text - Identifying Variable
 IDVARVAL text - Identifying Variable Value
 RELTYPE text - Relationship Type
 RELID text - Relationship Identifier