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Main features • Installation • Overview • Databases • Example workflow • Analysis across trials • Tests • Acknowledgements • Future

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

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Version

Install

install.packages('ctrdata')

Monthly Downloads

813

Version

1.15.2

License

MIT + file LICENSE

Maintainer

Ralf Herold

Last Published

April 14th, 2025

Functions in ctrdata (1.15.2)

ctrDb

Check and prepare nodbi connection object for ctrdata
dbFindFields

Find names of fields in the database collection
ctrFindActiveSubstanceSynonyms

Find synonyms of an active substance
dbFindIdsUniqueTrials

Get identifiers of deduplicated trial records
ctrOpenSearchPagesInBrowser

Open stored query in register or its search page
dfMergeVariablesRelevel

Merge variables, keeping type, and optionally relevel factors
installCygwinWindowsDoInstall

Install necessary helper apps (Windows only)
dfTrials2Long

Convert data frame with trial records into long format
dbGetFieldsIntoDf

Create data frame of specified fields from database collection
dbQueryHistory

Show history of queries loaded into a database collection
dfName2Value

Get value for variable of interest
ctrdata

ctrdata: get started, database connection, function overview
dfFindUniqueEuctrRecord

Select a single trial record from records of different EU Member States
ctrdata-registers

ctrdata: information on clinical trial registers
ctrGetQueryUrl

Get query details
ctrLoadQueryIntoDb

Load and store register trial information
dfListExtractKey

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

Merge two variables (superseded)