# Retrieve and Analyze Clinical Trials in Public Registers

## Documentation for package ‘ctrdata’ version 1.12.1

- DESCRIPTION file.
- User guides, package vignettes and other documentation.

## Help Pages

ctrdata-package | ctrdata: get started, connect database and function overview
ctrdata-registers | ctrdata: information on clinical trial registers
ctrFindActiveSubstanceSynonyms | Find synonyms of an active substance
ctrGetQueryUrl | Get query details
ctrLoadQueryIntoDb | Load and store register trial information
ctrOpenSearchPagesInBrowser | Open stored query or register search page
dbFindFields | Find names of fields in the database collection
dbFindIdsUniqueTrials | Get identifiers of deduplicated trial records
dbGetFieldsIntoDf | Create data frame of specified fields from database collection
dbQueryHistory | Show history of queries loaded into a database collection
dfListExtractKey | Extract named element(s) from list(s) into long-format data frame
dfMergeTwoVariablesRelevel | Merge two variables
dfName2Value | Get value for variable of interest
dfTrials2Long | Convert data frame with trial records into long format
installCygwinWindowsDoInstall | Install necessary helper apps (Windows only)