[R] (coxph, se) Obtaining standard errors of coefficients from coxph to store

[David Lloyd]

Hi all,

I'm wanting to be able to find and store the z-score of coxph below: -

modz=coxph(Surv(TSURV,STATUS)~RAGE+DAGE+REG_WTIME_M+CLD_ISCH+POLY_VS,
data=kidneyT,method="breslow")


I know summary(modz) will give me this, but how do i extract the
standard error or z-score values in a similar way to obtaining the
coefficients by coef(modz) ? I think it must be something to do with
modz$var but I'm having a complete mental blank.

I need this info so I can write a function to use within a bootstrap so
I can record the number of times (proportion) each variable in the Cox
PH model is actually significant over all the bootstrap resamples.

Any assistance is greatly appreciated

DL 


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