Displaying 1 result from an estimated 1 matches for "t_cov_".
2011 Dec 26
2
Problem of COX model with time dependent covariate
...FR_BASE:TIME -3.41 0.0329 0.0772 -44.2 0
But the result seems very different from that got by SPSS:
B SE Wald df Sig. Exp(B)
eGFR_BASE -13.603 .548 616.007 1 .000 .000
T_COV_*eGFR_BASE .860 .115 55.859 1 .000 2.362
so my questions are :
1, Is it correct to deal with time dependent covariate in Cox regression using R? if not, how to do it ?
2, How T_COV_ was calculated in SPSS, and is it the same with the survival time?
Many thanks.
GZ...