I have a study with a baseline and follow-up survey. They are de-identified but have an embedded piece of data so I can match them up later. The two surveys are different, especially as the follow-up surveys are specific to the assigned study group. Looking briefly at another listing, it says something about a string query from the first to the second, but I am not sure I did that. I embedded the same StudyID in each survey for the participant.
How do I match up the baseline survey to follow-up survey using the embedded data?