Compute the number of days of prior observation in the current observation period at a certain date

Usage

addPriorObservation(
  x,
  indexDate = "cohort_start_date",
  priorObservationName = "prior_observation",
  priorObservationType = "days",
  name = NULL
)

Arguments

x: Table with individuals in the cdm.
indexDate: Variable in x that contains the date to compute the prior observation.
priorObservationName: name of the new column to be added.
priorObservationType: Whether to return a "date" or the number of "days".
name: Name of the new table, if NULL a temporary table is returned.

Value

cohort table with added column containing prior observation of the individuals.

Examples

# \donttest{
cdm <- mockPatientProfiles()

cdm$cohort1 |>
  addPriorObservation()
#> # Source:   table<og_132_1734613844> [?? x 5]
#> # Database: DuckDB v1.1.3 [unknown@Linux 6.8.0-1017-azure:R 4.4.2/:memory:]
#>    cohort_definition_id subject_id cohort_start_date cohort_end_date
#>                   <int>      <int> <date>            <date>         
#>  1                    1          1 1968-11-03        1971-01-10     
#>  2                    1          2 1948-01-28        1957-12-17     
#>  3                    2          3 1924-04-27        1932-10-04     
#>  4                    3          4 1916-10-19        1920-09-01     
#>  5                    2          5 1985-06-29        1987-12-31     
#>  6                    2          6 1993-04-29        1996-06-11     
#>  7                    3          7 1922-11-18        1949-08-28     
#>  8                    1          8 1977-08-06        1995-12-04     
#>  9                    1          9 1991-06-24        2005-05-09     
#> 10                    1         10 1948-02-23        1951-09-25     
#> # ℹ 1 more variable: prior_observation <int>

mockDisconnect(cdm = cdm)
# }