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Restrict cohort to only the first cohort record per subject
requireIsFirstDrugEntry.Rd
Filter the cohort table keeping only the first cohort record per subject.
Usage
requireIsFirstDrugEntry(
cohort,
cohortId = NULL,
name = omopgenerics::tableName(cohort)
)
Arguments
- cohort
A cohort table in a cdm reference.
- cohortId
IDs of the cohorts to modify. The default is NULL meaning all cohorts will be used; otherwise, only the specified cohorts will be modified, and the rest will remain unchanged.
- name
Name of the table with the filtered cohort records. The default name is the original cohort name, where the original table will be overwritten.
Examples
# \donttest{
library(DrugUtilisation)
library(dplyr)
cdm <- mockDrugUtilisation()
cdm$cohort1 <- cdm$cohort1 |>
requireIsFirstDrugEntry()
attrition(cdm$cohort1) |> glimpse()
#> Rows: 6
#> Columns: 7
#> $ cohort_definition_id <int> 1, 1, 2, 2, 3, 3
#> $ number_records <int> 3, 3, 2, 2, 5, 5
#> $ number_subjects <int> 3, 3, 2, 2, 5, 5
#> $ reason_id <int> 1, 2, 1, 2, 1, 2
#> $ reason <chr> "Initial qualifying events", "require is the firs…
#> $ excluded_records <int> 0, 0, 0, 0, 0, 0
#> $ excluded_subjects <int> 0, 0, 0, 0, 0, 0
# }