search for: wexp

...ion (i.e., 1, 2, 3). Question 1: my site variable is technically a categorical (i.e., not ranked), random factor but how do I (or can I?)define this? Fox shows this method for plotting out seperate curves for a single factor: > mod.allison <- coxph(Surv(week, arrest) ~ fin + age + race + wexp + mar + > paro + prio, + data=Rossi) > attach(Rossi) > Rossi.fin <- data.frame(fin=c(0,1), age=rep(mean(age),2), > race=rep(mean(race),2), + wexp=rep(mean(wexp),2), mar=rep(mean(mar),2), paro=rep(mean(paro),2), + prio=rep(mean(prio),2)) > detach() > plot(survfit(mod.allison, ne...

...h integer codes from 0--3. I'd like a histogram with a single bar for 0, 1, 2 and 3. I'd like each of the 4 bars centered over a label. hist(mydata, breaks=4, main="Simulation") gives me three bars. The best I've been able to do is do something like print(hist((wexp), breaks=25, main="Simulation")) This gives me something close to what I want, but seems like a silly way to do it. I'm about to give up and have someone do it in Excel (which peeves me to no end). To further complicate matters, one data set has no items in the zero cell. I'd...

...rvival Data? available here: http://cran.r-project.org/doc/contrib/Fox-Companion/appendix-cox-regression.pdf I am particularly interested in modelling survival with time-dependent covariates (Section 4). The data look like this: > Rossi.2[1:50,] start stop arrest.time week arrest fin age race wexp mar paro prio educ employed 0 1 0 20 1 0 27 1 0 0 1 3 3 0 1 2 0 20 1 0 27 1 0 0 1 3 3 0 ... 18 19 0 20 1 0 27 1 0 0 1 3 3 0 19 20 1 20 1 0 27 1 0 0 1 3 3 0 0 1 0 17 1 0 18 1 0 0 1 8 4 0 1 2 0 17 1 0 18 1 0 0 1 8 4 0 ... 15 16 0 17 1 0 18 1 0 0 1 8 4 0 16 17 1 17 1 0 18 1 0 0 1 8 4 0 0 1 0 25 1 0 19...

Hi, I'm new to R and using it for Cox survival analysis. Thanks to this great forum I learned how to compute the HR with its confidence interval. My question would be: Is there any way to get the p-value for a hazard ratio in addition to the confidence interval? Thanks, Thierry -- Thierry Panje Visiting Student Researcher Department of Psychology Stanford