f.numSites: Calculate number of sites of a study

In ctrdata: Retrieve and Analyze Clinical Trials in Public Registers

Calculate number of sites of a study

Description

Trial concept calculated: number of the sites where the trial is conducted. EUCTR lacks information on number of sites outside of the EEA; for each non-EEA country mentioned, at least one site is assumed.

Usage

f.numSites(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 '.numSites', an integer.

Examples

# fields needed
f.numSites()

## Not run: 

# 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.numSites",
  con = dbc)

## End(Not run)

ctrdata documentation built on April 3, 2025, 8:12 p.m.