calc_DY: Calculate a DY variable (day of study)

In sdtmval: Validate SDTM Domains

Calculate a DY variable (day of study)

Description

Utilizes the DY method from the SDTM spec: --DTC-RFSTDTC+1 if --DTC is on or after RFSTDTC. --DTC-RFSTDTC if --DTC precedes RFSTDTC. This function can also be used for the ENDY method from the spec which has the same logic.

Usage

calc_DY(tbl, DY_col, DTC_col, RFSTDTC = "RFSTDTC")

Arguments

tbl	a data frame with the date column RFSTDTC and the column specified by the DTC_col argument
DY_col	string, the name of the new DY column to create
DTC_col	string, the column in tbl which has the dates for which to calculated the DY value; should either already have a date class or be a character vector in the format YYYY-MM-DD
RFSTDTC	a string, the column to use for RFSTDTC, default is "RFSTDTC"; should either already have a date class or be a character vector in the format YYYY-MM-DD

Value

a modified copy of tbl with the new DY column

See Also

create_BLFL(), create_EPOCH()

Examples

df <- data.frame(
  DTC = c("2023-08-01", "2023-08-02", "2023-08-03", "2023-08-04"),
  RFSTDTC = rep("2023-08-02", 4)
)
calc_DY(df, DY_col = "XXDY", DTC_col = "DTC")

sdtmval documentation built on Oct. 23, 2023, 5:10 p.m.