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cumplo
2004 Aug 19
0
Clustering and the test for proportional hazards
...when the model contains a cluster
variable? The output looks strange with the cluster variable.
My intervals are based on calendar time and the clustering variable is
related to the season the event occurs in.
model1<-coxph(Surv(Start,Stop,Event)~LagAOO+I(LagAOO^2)+
FirstSeen+TSLE+strata(CumPOO.rc)+cluster(quarter),data=data8, x=T)
>Cox.zph(model1)
LagAOO 0.209 5.61 0.0179
I(LagAOO^2) -0.209 5.61 0.0179
FirstSeen 0.209 5.61 0.0179
TSLE 0.209 5.61 0.0179
GLOBAL NA 5.61 0.2304
In this example there is strong evidence for non-proportional hazar...