Hi, Thank you for your help... it works for schoenfeld residuals but for martingale residuals it gave me many residuals for the same subject as shown in the table: id start stop x1 martingale 1 1 3 2 r1 1 3 5 5 r2 1 5 10 4 r3 1 10 19 7 r4 1 19 20 8 r5 1 20 21 10 . Is it correct to plot martingale residuals with many residuals for each subject ? is there anyway to aggregate them ? If i need to have one residual for each subject, can i sum the residuals per subject ? Thank you in advance, Aya
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