From the above code, i am getting the attached output. Derived weight(dwt) 80 is same for all visit for subject 1. When the pdiff is more than 10%. However, i want to display dwt =cwt when pdiff is more than 10%. For subject 2 it is working for visit 2. I am not sure, why it is not working for subject 1. To answer your questions, 1) In real data, i will sort with subject and visit and take the first.subject as first observation for each subject. 2) No, subject will not start visit not equal to 1.
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