Hello:
In the example below (or for a censored data) using survfit.coxph, can
anyone point me to a link or a pdf as to how the probabilities appearing in
bold under "summary(pred$surv)" are calculated? Do these represent
acumulative probability distribution in time (not including censored time)?
Thanks very much,
parmee
*fit <- coxph(Surv(futime, fustat) ~ age, data = ovarian)*
*pred <- survfit(fit, newdata=data.frame(age=60))*
*summary(pred)*
time n.risk n.event survival std.err lower 95% CI upper 95% CI
59 26 1 *0.978* 0.0240 0.932 1.000
115 25 1 *0.952* 0.0390 0.878 1.000
156 24 1 *0.917* 0.0556 0.814 1.000
268 23 1 *0.880* 0.0704 0.752 1.000
329 22 1 *0.818* 0.0884 0.662 1.000
353 21 1 *0.760* 0.0991 0.588 0.981
365 20 1 *0.698* 0.1079 0.516 0.945
431 17 1 *0.623* 0.1187 0.429 0.905
464 15 1 *0.549* 0.1248 0.352 0.858
475 14 1 *0.480* 0.1267 0.286 0.805
563 12 1 *0.382* 0.1332 0.193 0.757
638 11 1 *0.297* 0.1292 0.127 0.697
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