Impute very last EXENDTC for a subject and EXTRT to RFENDTC, if absent
Source:R/nif_imputations.R
impute_exendtc_to_rfendtc.RdIn EX for multiple-dose studies, the EXENDTC field for the very last administration epoch may be missing. This is occasionally found when SDTM data are generated before full cleaning of the clinical data, e.g., in the case of interim analyses of clinical study data. In some of these cases, the DM domain is however already completed with the RFENDTC field. This is the reference end date-time field that specifies the date-time of the last treatment administration. This function completes EXENDTC for the very last administration time based on the RFENDTC, if provided in DM.