Hi everyone, I need hep about how to delete irrelevant events. Each patient in my data has multiple visits/records, for example, from 1st to 10th visits. In his 3rd visit, he had a surgery in our hospital. Right now, my attempt is to keep the records of 3~10 only and get rid of the 1st and 2nd visits because those happened before his surgery. Could any of you suggest a method for this regard? Thank you.
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