cdmSample {CDMConnector}

R Documentation

Subset a cdm object to a random sample of individuals

Description

cdmSample takes a cdm object and returns a new cdm that includes only a random sample of persons in the cdm. Only person_ids in both the person table and observation_period table will be considered.

Usage

cdmSample(cdm, n)

cdm_sample(cdm, n)

Arguments

cdm	A cdm_reference object
n	Number of persons to include in the cdm

Details

Value

A modified cdm_reference object where all clinical tables are lazy queries pointing to subset

Examples

## Not run: 
library(CDMConnector)
library(dplyr, warn.conflicts = FALSE)

con <- DBI::dbConnect(duckdb::duckdb(), eunomia_dir())

cdm <- cdm_from_con(con, cdm_schema = "main")

cdmSampled <- cdmSample(cdm, n = 2)

cdmSampled$person %>%
  select(person_id)
#> # Source:   SQL [2 x 1]
#> # Database: DuckDB 0.6.1
#>   person_id
#>       <dbl>
#> 1       155
#> 2      3422

DBI::dbDisconnect(con, shutdown = TRUE)

## End(Not run)

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