[R] Time dependant covariate

[Paula Iso-Markku]

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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