search for: alldpinfectionandbronch

...ow estimator for the baseline cumulative hazard function (H(t)) in each stratum. As far as i know, if the proportionality assumption holds, the plot of ln[H(t)] of each stratum versus time should be approximately parallel. i.e fit<-coxph(Surv(start,end,status)~sx+rated+AGLEVEL+strata(Z1),data=ALLDPinfectionandbronchitis) ss<-survfit(fit) plot(ss,fun="cumhaz") My question is on whether the cumulative hazard given by the above command is actually a breslow estimator for baseline cumulative hazard ,i.e, estimator=sum( number of death/ (sum(risk score in risk set)) or a nelson-Aalen estimator. if...

...d with a Breslow-type estimate of survival. Alternatively, a K-M estimator for the cumulative hazard can be selected. See ?basehaz for details. In your example, you could do something like this: bh <- basehaz(fit, centered=TRUE) require("lattice") xyplot(hazard ~ time | strata, data=ALLDPinfectionandbronchitis) -Christos Christos Hatzis, Ph.D. Vice President, Technology Nuvera Biosciences, Inc. 400 West Cummings Park Suite 5350 Woburn, MA 01801 Tel: 781-938-3830 www.nuverabio.com -----Original Message----- From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at stat.math.ethz.ch] O...