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{
library(PatientProfiles)

cdm <- mockPatientProfiles(source = "duckdb")

cdm$cohort1 |>
  addPriorObservationQuery()
#> # Source:   SQL [?? x 5]
#> # Database: DuckDB 1.3.3-dev231 [unknown@Linux 6.11.0-1018-azure:R 4.5.1/:memory:]
#>    cohort_definition_id subject_id cohort_start_date cohort_end_date
#>                   <int>      <int> <date>            <date>         
#>  1                    1          3 1963-05-20        1970-03-12     
#>  2                    3          5 1962-12-16        1966-01-09     
#>  3                    1          1 1970-08-16        1973-10-23     
#>  4                    3          8 2002-06-08        2012-06-11     
#>  5                    2          6 1957-12-07        1987-12-10     
#>  6                    1          7 1955-12-20        1969-11-18     
#>  7                    3          2 1958-01-09        1959-03-08     
#>  8                    3          4 1933-11-22        1937-11-30     
#>  9                    3         10 1950-08-06        1967-05-10     
#> 10                    2          9 1996-11-29        1998-10-22     
#> # ℹ 1 more variable: prior_observation <int>

# }