ctrdata

The ctrdata package provides functions to retrieve,
and to prepare for analysis, information on clinical
trials from public registers (EUCTR and CTGOV).
There are three categories of functions,
in sequence of their use in a workflow:

internal

Provides functions for querying, retrieving and analyzing
protocol- and results-related information on clinical trials from
two public registers, the 'European Union Clinical Trials Register'
('EUCTR', <https://www.clinicaltrialsregister.eu/>) and
'ClinicalTrials.gov' ('CTGOV', <https://clinicaltrials.gov/>). The
trial information is transformed and stored in a database ('SQLite'
or 'MongoDB', via 'nodbi'). Functions are provided to identify de-
duplicated records, to easily find and extract variables (fields)
of interest even from complex nesting as used by the registers,
and to update previous queries that users retrieved in a database.
The package can be used for meta analysis and trend-analysis of
the design and conduct as well as results of clinical trials.

Ralf Herold

Retrieve and Analyze Clinical Trials in Public Registers

ctrdata function

<a rd-options="" href="/link/ctrOpenSearchPagesInBrowser?package=ctrdata&version=1.5.2" data-mini-rdoc="ctrdata::ctrOpenSearchPagesInBrowser">ctrOpenSearchPagesInBrowser</a>,
<a rd-options="" href="/link/ctrFindActiveSubstanceSynonyms?package=ctrdata&version=1.5.2" data-mini-rdoc="ctrdata::ctrFindActiveSubstanceSynonyms">ctrFindActiveSubstanceSynonyms</a>,
<a rd-options="" href="/link/ctrGetQueryUrl?package=ctrdata&version=1.5.2" data-mini-rdoc="ctrdata::ctrGetQueryUrl">ctrGetQueryUrl</a>,
<a rd-options="" href="/link/ctrLoadQueryIntoDb?package=ctrdata&version=1.5.2" data-mini-rdoc="ctrdata::ctrLoadQueryIntoDb">ctrLoadQueryIntoDb</a>

Operations on a clinical trial register

<a rd-options="" href="/link/dbFindFields?package=ctrdata&version=1.5.2" data-mini-rdoc="ctrdata::dbFindFields">dbFindFields</a>,
<a rd-options="" href="/link/dbQueryHistory?package=ctrdata&version=1.5.2" data-mini-rdoc="ctrdata::dbQueryHistory">dbQueryHistory</a>

Using the database that holds downloaded information

<a rd-options="" href="/link/dbGetFieldsIntoDf?package=ctrdata&version=1.5.2" data-mini-rdoc="ctrdata::dbGetFieldsIntoDf">dbGetFieldsIntoDf</a>,
<a rd-options="" href="/link/dfTrials2Long?package=ctrdata&version=1.5.2" data-mini-rdoc="ctrdata::dfTrials2Long">dfTrials2Long</a>,
<a rd-options="" href="/link/dfName2Value?package=ctrdata&version=1.5.2" data-mini-rdoc="ctrdata::dfName2Value">dfName2Value</a>.
<a rd-options="" href="/link/dfMergeTwoVariablesRelevel?package=ctrdata&version=1.5.2" data-mini-rdoc="ctrdata::dfMergeTwoVariablesRelevel">dfMergeTwoVariablesRelevel</a>,

Get an R data frame from database, and operate on it

From the database, a vector of de-duplicated identifiers of
clinical trial records can be obtained with
<a rd-options="" href="/link/dbFindIdsUniqueTrials?package=ctrdata&version=1.5.2" data-mini-rdoc="ctrdata::dbFindIdsUniqueTrials">dbFindIdsUniqueTrials</a> and this can be used to select
subsets of interest from R dataframes.

ctrdata: ctrdata: Overview on functions

Description

Arguments

Operations on a clinical trial register

Using the database that holds downloaded information

Get an R data frame from database, and operate on it

Deduplication