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_116_1750280297> [?? x 5]
#> # Database: DuckDB v1.3.0 [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                    3          7 1997-03-31        1997-06-24     
#>  2                    1          5 1963-12-26        1967-05-15     
#>  3                    2          8 1945-12-06        1979-12-15     
#>  4                    1         10 1909-02-07        1924-01-03     
#>  5                    1          9 1987-04-20        2001-03-03     
#>  6                    2          2 2012-01-11        2018-05-01     
#>  7                    3          3 1944-04-23        1949-09-04     
#>  8                    3          6 1932-05-27        1932-09-24     
#>  9                    3          4 1932-08-17        1941-07-10     
#> 10                    1          1 1978-04-29        1981-05-19     
#> # ℹ 1 more variable: prior_observation <int>

mockDisconnect(cdm = cdm)
# }