Derive Total Treatment Duration (Days)

Derives total treatment duration (days) (TRTDURD).

Note: This is a wrapper function for the more generic derive_vars_duration().

derive_var_trtdurd(dataset, start_date = TRTSDT, end_date = TRTEDT)

Arguments

dataset

Input dataset

The variables specified by the start_date and end_date arguments are expected to be in the dataset.

Default value

none

start_date

The start date

A date or date-time object is expected.

Refer to derive_vars_dt() to impute and derive a date from a date character vector to a date object.

Default value

TRTSDT

end_date

The end date

A date or date-time object is expected.

Refer to derive_vars_dt() to impute and derive a date from a date character vector to a date object.

Default value

TRTEDT

Value

The input dataset with TRTDURD added

Details

The total treatment duration is derived as the number of days from start to end date plus one.

See also

derive_vars_duration()

Date/Time Derivation Functions that returns variable appended to dataset: derive_vars_dt(), derive_vars_dtm(), derive_vars_dtm_to_dt(), derive_vars_dtm_to_tm(), derive_vars_duration(), derive_vars_dy()

Examples

library(tibble)
library(lubridate)

data <- tribble(
  ~TRTSDT, ~TRTEDT,
  ymd("2020-01-01"), ymd("2020-02-24")
)

derive_var_trtdurd(data)
#> # A tibble: 1 × 3
#>   TRTSDT     TRTEDT     TRTDURD
#>   <date>     <date>       <dbl>
#> 1 2020-01-01 2020-02-24      55