Hello, Can I get help? I have the attached kind of material and I should create a time-dependant covariate from the variate "Optime"? I have tried using survsplit function but I don't know exactly how to do it. Or I can't get it to work. How can I split every id's follow-up time into two rows according the time of optime (The time they get treatment)?
Best regards, Paula Iso-Markku
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