Parse data from ctgov

[chartgerink]

In the data/ folder there are raw xml files downloaded from ClinicalTrials.gov. When parsing works, the latest results can be downloaded in full here. This only returns Completed | Studies With Results | Interventional Studies.

• [x] Parse the raw xml
• [x] Identify randomized trials
• [x] Specify what trial metadata is relevant to save
• [x] Parse the baseline measurements data
• [x] Write a function to run the methods outlined in the Carlisle papers (see README). Discussion of implementing this in issue #2!
• [x] Create loop to run function on each trial

[chartgerink]

This is the information parsed from each trial

  nct_id <- z$id_info$nct_id
  study_design <- z$study_design
  randomized <- grepl(study_design, pattern = 'randomized', ignore.case = TRUE)
  start_date <- z$start_date
  completion_date <- z$completion_date
  overall_status <- z$overall_status
  trial_condition <- z$condition
  trial_phase <- z$phase
  oversight_authority <- z$oversight$authority
  trial_source <- z$source
  fda_regulated <- z$is_fda_regulated
  number_of_arms <- z$number_of_arms
  intervention_type <- z$intervention$intervention_type

Plus the baseline measurements.

[chartgerink]

Completed in commit 3223ffe4ea5bfb82f639688ae6fa16a2d4947c67

Minor changes might be necessary still though.