Impute missing EXENDTC to the day before the next EXSTDTC.
Source:R/nif_imputations.R
impute_missing_exendtc.RdIn some cases, EX does not contain EXENDTC for administration episodes that
are not the very last administration episode. This should only occur when
non-clean clinical data is analyzed, e.g., in the context of an interim
analysis. In most cases, such instances must be manually resolved. There
could be AE information with consequences of "drug withdrawn" available
that may be helpful, or other information from clinical context can be used
to determine how many IMP administrations were done in the respective
interval. This function should only be used if no other information is
available as it takes a worst-case approach, i.e., assumes that IMP was
administered up to the day before the subsequent administration interval.
Note that this imputation does not apply to the last administration per
subject and EXTRT. For these cases, missing EXENDTC can be imputed to the
global cut off date using impute_exendtc_to_cutoff().