Dear users,
In a study with recurrent events:
My objective is to get estimates of survival (obtained through a Cox model) by
rank of recurrence and by treatment group.
With the following code (corresponding to a model with a global effect of the
treatment=rx), I get no error and manage to obtain what I want :
data<-(bladder)
model1<-coxph(Surv(stop,event)~rx+strata(enum)+cluster(id),data=bladder)
data1<-data.frame(rx=1)
survfit(model1,newdata=data1)
But with the model with strata by treatment interaction (corresponding to a
model with an effect of the treatment by rank), I get the following error:
model2<-coxph(Surv(stop,event)~rx*strata(enum)+cluster(id),data=bladder)
data1<-data.frame(rx=1)
survfit(model2,newdata=data1)
Erreur dans strata(enum) : objet "enum" non trouvé =>error in strata(enum) :
object "enum" not found
Would you have any idea to help me?
Thanks in advance,
Eva
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