Hi Katherine,
The question is asking you to create a new variable that captures whether patient was ever positive, i.e. both patients who were positive since baseline and patients who became positive at some point during follow-up.
Sorry about the wording being tricky.
Nizar
The question is asking you to create a new variable that captures whether patient was ever positive, i.e. both patients who were positive since baseline and patients who became positive at some point during follow-up.
Sorry about the wording being tricky.
Nizar