Install package ctrdata on an R system | Databases to use | Attach package ctrdata | Credit to clinical trial registers | Quote or reference ctrdata

Preparations | Find fields / variables of interest | Data frame from database | Metadata from data frame | De-duplicate records | Use trial concepts to simplify analyses | Reviewing a specific trial | Simple analysis of dates | Cross-register clinical trial concepts | Merging fields for analysis | Historic versions of trial records and changes in sample sizes | Analysing nested fields such as trial results | Analysing primary endpoints | Analysis methods and p values | Investigational or authorised medicinal product? | Analyses using MongoDB pipeline | Aggregation | Mapreduce

Get started | Attach package ctrdata | Open register's advanced search page in browser | Adjust search parameters and execute search in browser | Copy address from browser address bar to clipboard | Get address from clipboard | Connect database, retrieve, transform, save and check | Loading only a single version of EUCTR protocol-related data | Repeat and update a previous query | Results-related trial information | Add trial information from several registers | Add personal annotations | Find synonyms of active substance names | Find platform trials | Load information using trial identifiers

Summary | Connect | docdb_create | Identifiers | docdb_get | docdb_query | Field names | docdb_update | docdb_delete | Disconnect and shutdown