Dear R users! I reformulate the question with another example perhaps my question will be more clearly now. I have several subjects. One subject has multiple records. Only a starting point exists the end point is vague. Here is an example: itm ID exercise time 1.401869 1 0 1 1.324390 1 0 2 1.324390 1 0 3 1.333338 1 0 4 1.346761 1 0 5 1.315441 1 1 6 1.337812 2 0 1 1.319915 2 0 2 1.351235 2 1 3 itm is the covariate; ID is the subject Id; exercise indicates if the subject is dead=1 or alive=0 How can I allocate the multiple records to one subject (for example record 1-6 are part of subject with ID 1 record 7-9 are part of subject with ID2) and process a survival regression. the "survRegData <- survreg(formula=Surv(time,exercise)~itm, data=Data, dist="weibull")" command doesn't take into account that multiple records are part of one subject. Many thanks! Fabian Hefner
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