Restrict cohort to first entry — requireIsFirstEntry • CohortConstructor

requireIsFirstEntry() filters cohort records, keeping only the first cohort entry per person.

Usage

requireIsFirstEntry(cohort, cohortId = NULL, name = tableName(cohort))

Arguments

cohort: A cohort table in a cdm reference.
cohortId: Vector identifying which cohorts to modify (cohort_definition_id or cohort_name). If NULL, all cohorts will be used; otherwise, only the specified cohorts will be modified, and the rest will remain unchanged.
name: Name of the new cohort with the restriction.

Value

A cohort table in a cdm reference.

Examples

# \donttest{
library(CohortConstructor)
cdm <- mockCohortConstructor()
cdm$cohort1 <- requireIsFirstEntry(cdm$cohort1)
# }