Code
derive_var_ontrtfl(adcm, start_date = ASTDT, end_date = AENDT, ref_start_date = TRTSDT,
ref_end_date = TRTEDT, span_period = TRUE)
Output
USUBJID ASTDT TRTSDT TRTEDT AENDT ONTRTFL
1 P01 2018-03-15 2019-01-01 NA 2022-12-01 Y
2 P02 2020-04-30 2019-01-01 NA 2022-03-15 Y
3 P03 2020-04-30 2019-01-01 NA <NA> Y
4 P04 2020-04-30 <NA> NA <NA> <NA>
Code
derive_var_ontrtfl(adcm, start_date = ASTDT, end_date = AENDT, ref_start_date = TRTSDT,
ref_end_date = TRTEDT)
Output
USUBJID ASTDT TRTSDT TRTEDT AENDT ONTRTFL
1 P01 2018-03-15 2019-01-01 NA 2022-12-01 <NA>
2 P02 2020-04-30 2019-01-01 NA 2022-03-15 Y
3 P03 2020-04-30 2019-01-01 NA <NA> Y
4 P04 2020-04-30 <NA> NA <NA> <NA>
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