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ctrdata for aggregating and analysing clinical trials

The package ctrdata provides functions for retrieving (downloading) information on clinical trials from public registers, and for aggregating and analysing this information; it can be used for the

EU Clinical Trials Register (“EUCTR”, https://www.clinicaltrialsregister.eu/)
ClinicalTrials.gov (“CTGOV”, https://clinicaltrials.gov/)
ISRCTN (https://www.isrctn.com/)

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Version

Install

install.packages('ctrdata')

Monthly Downloads

813

Version

1.8.0

License

MIT + file LICENSE

Maintainer

Ralf Herold

Last Published

April 14th, 2025

Functions in ctrdata (1.8.0)

dfListExtractKey

Extract named element(s) from list(s) into long-format data frame

ctrFindActiveSubstanceSynonyms

Find synonyms of an active substance

dfName2Value

Extract information of interest (e.g., endpoint) from long data frame of protocol- or result-related trial information as returned by dfTrials2Long

dfTrials2Long

Extract trial information into long format

dbQueryHistory

Show the history of queries that were loaded into a database

dfFindUniqueEuctrRecord

Select single trial record from records of different EU Member States

installCygwinWindowsDoInstall

Convenience function to install a minimal cygwin environment under MS Windows, including perl, sed and php

dfMergeTwoVariablesRelevel

Merge two variables into one, optionally map values to new levels

dbFindFields

Find names of fields in the database collection

ctrOpenSearchPagesInBrowser

Open advanced search pages of register(s) or execute search in browser

ctrGetQueryUrlFromBrowser

Import from clipboard the URL of a search in one of the registers

ctrDb

Check and prepare nodbi connection object for ctrdata

ctrGetQueryUrl

Extract query parameters and register name from input or from clipboard into which the URL of a register search was copied

dbFindIdsUniqueTrials

Deduplicate records to provide unique clinical trial identifiers

ctrLoadQueryIntoDb

Retrieve or update information on clinical trials from register and store in database

ctrdata

ctrdata: Overview on functions

dbGetFieldsIntoDf

Create data frame by extracting specified fields from database collection