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Dear Thomas, The head of my dataset > head(wsuv) parcel sp time censo treatment species 1 S8 Poecilanthe effusa ( Hub. ) Ducke. 1 1 1 1 2 S8 Poecilanthe effusa ( Hub. ) Ducke. 1 1 1 1 3 S8 Poecilanthe effusa ( Hub. ) Ducke. 1 1 1 1 4 S8 Poecilan...

...tion was excluded. We followed those leaves for 42 months and noted the presence and absence at each visit. I then carried out a Cox Harzard model to see differences in leaf mortality between parcels and among species over time: leaves.cox <- coxph(Surv(time, censo) ~ treatment + species, data= wsuv) When I plot 'survfitt(leaves.cox)', I come up with a survivor curve that starts at 1 ends at 0.4. The problem is that at time 42 almost all leaves are dead. I wander if surfit plot at time 42 should also be close to zero? I followed examples from Venables and Ripley' book. (These a...