Query to add the number of days of prior observation in the current observation period at a certain date

`r lifecycle::badge("experimental")` Same as `addPriorObservation()`, except query is not computed to a table.

Usage

addPriorObservationQuery(
  x,
  indexDate = "cohort_start_date",
  priorObservationName = "prior_observation",
  priorObservationType = "days"
)

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".

Value

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

Examples

# \donttest{
cdm <- mockPatientProfiles()

cdm$cohort1 |>
  addPriorObservationQuery()
#> # Source:   SQL [?? 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                    2          1 1990-08-27        1993-08-19     
#>  2                    1          2 1991-03-07        1993-01-31     
#>  3                    2          3 1970-07-16        1993-09-24     
#>  4                    3          4 1972-11-17        1981-03-07     
#>  5                    3          5 1947-02-10        1971-01-04     
#>  6                    1          6 1965-09-11        1975-07-07     
#>  7                    3          7 1947-08-01        1980-08-22     
#>  8                    2          8 1907-07-11        1914-09-12     
#>  9                    3          9 1923-09-13        1933-05-30     
#> 10                    2         10 1909-11-27        1913-06-11     
#> # ℹ 1 more variable: prior_observation <int>

mockDisconnect(cdm = cdm)
# }