dfTrials2Long {ctrdata}

Convert data frame with trial records into long format

Description

The function works with procotol- and results- related information. It converts lists and other values that are in a data frame returned by dbGetFieldsIntoDf into individual rows of a long data frame. From the resulting long data frame, values of interest can be selected using dfName2Value. The function is particularly useful for fields with complex content, such as node field "clinical_results" from EUCTR, for which dbGetFieldsIntoDf returns as a multiply nested list and for which this function then converts every observation of every (leaf) field into a row of its own.

Usage

dfTrials2Long(df)

Arguments

df

Data frame (or tibble) with columns including the trial identifier (_id) and one or more variables as obtained from dbGetFieldsIntoDf

Value

A data frame (or tibble, if tibble is loaded) with the four columns: '_id', 'identifier', 'name', 'value'

Examples

dbc <- nodbi::src_sqlite(
   dbname = system.file("extdata", "demo.sqlite", package = "ctrdata"),
   collection = "my_trials")

dfwide <- dbGetFieldsIntoDf(
  fields = "clinical_results.participant_flow",
  con = dbc)

dfTrials2Long(df = dfwide)