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unlucky
2011 Jun 03
1
Surv(): Stop time must be > start time, NA created
...2 1 NA NA <NA> <NA>
...
Obviously some individuals (lines 1,2,5) will first develop parkinson, then a few years later, dementia. Some individuals will not develop dementia (lines 3 and 6, where age of death and age of dementia correspond, but the censor variable is 1). Some (more) unluky individuals develop parkinson and dementia at the same time (line 4).
my coxph model looks like
coxph(Surv(age.mot,age.dem, censor) ~ x1 + x2 + x3 + x4, mydata)
and I get the warning:
In Surv(age.mot, age.dem, censor) :
Stop time must be > start time, NA created
I am almost sure that thi...