sdtm_ta.RdTrial Arms data frame - One record per planned Element per Arm
sdtm_taa data frame with 8 rows and 10 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
DOMAIN text - Domain Abbreviation
ARMCD text - Planned Arm Code
ARM text - Description of Planned Arm
TAETORD integer - Order of Element within Arm
ETCD text - Element Code
ELEMENT text - Description of Element
TABRANCH text - Branch
TATRANS text - Transition Rule
EPOCH text - Epoch