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_119_1751196095> [?? x 5]
#> # Database: DuckDB v1.3.1 [unknown@Linux 6.11.0-1015-azure:R 4.5.1/:memory:]
#>    cohort_definition_id subject_id cohort_start_date cohort_end_date
#>                   <int>      <int> <date>            <date>         
#>  1                    2          8 1963-04-02        1975-08-05     
#>  2                    2          1 1945-12-20        1964-04-11     
#>  3                    2         10 1959-01-17        1976-06-12     
#>  4                    3          4 1975-09-18        1979-05-02     
#>  5                    2          3 1940-03-02        1940-12-11     
#>  6                    1          9 1959-07-04        1960-03-27     
#>  7                    1          7 1913-02-17        1914-10-20     
#>  8                    3          2 1953-03-30        1954-02-13     
#>  9                    1          5 1959-07-16        1959-08-27     
#> 10                    2          6 1916-12-23        1931-10-23     
#> # ℹ 1 more variable: prior_observation <int>

mockDisconnect(cdm = cdm)
# }