f.externalLinks: Calculate the external references from a study's register...
In ctrdata: Retrieve and Analyze Clinical Trials Data from Public Registers

f.externalLinks

R Documentation

Calculate the external references from a study's register record

Description

Trial concept calculated: Calculates the links e.g. to publications or other external files referenced from a study record. Requires loading results-related information for EUCTR. Note that documents stored in registers can be downloaded directly, see ctrLoadQueryIntoDb.

Usage

f.externalLinks(df = NULL)

Arguments

`df`	data frame such as from dbGetFieldsIntoDf. If 'NULL', prints fields needed in 'df' for calculating this trial concept, which can be used with dbGetFieldsIntoDf.

Value

data frame with columns '_id' and new column '.externalLinks' (character).

Examples

# fields needed
f.hasResults()

# apply trial concept when creating data frame
dbc <- nodbi::src_sqlite(
  dbname = system.file("extdata", "demo.sqlite", package = "ctrdata"),
  collection = "my_trials", flags = RSQLite::SQLITE_RO)
trialsDf <- dbGetFieldsIntoDf(
  calculate = "f.externalLinks",
  con = dbc)
trialsDf

ctrdata documentation built on Jan. 18, 2026, 9:07 a.m.