Displaying 1 result from an estimated 1 matches for "excl0".
Did you mean:
excl
2007 Oct 01
3
Apparently Conflicting Results with coxph
...0.485 0.337 0.74
Likelihood ratio test=0.11 on 1 df, p=0.738 n= 335
Since this was unexpected, I created a non-counting process data
frame with an indicator variable representing received an implant
or not. Here are the results:
Call:
coxph(formula = Surv(Days, Dead) ~ Implant, data = nina.excl0)
coef exp(coef) se(coef) z p
Implant -1.77 0.171 0.426 -4.15 3.3e-05
Likelihood ratio test=19.1 on 1 df, p=1.21e-05 n= 197
I found this degree of discrepancy surprising, especially the point
estimate of the coefficient. I have verified the data frames are
set up cor...