[R] survival analysis simulation question

[Joshua Wiley]

On Thu, May 10, 2012 at 7:41 PM, Grace Ma <grace.yanfei.m at gmail.com> wrote:
> Hi,
> I am trying to simulate a regression on survival data under a few
> conditions:
> 1. Under different error distributions
> 2. Have the error term be dependent on the covariates
>
> But I'm not sure how to specify either conditions. I am using the Design
> package to perform the survival analysis using the survreg, bj, coxph
> functions.   Any help is greatly appreciated.
>
> This is what I have so far:
> survtime  <- 10*rexp(500)  #distribution of survival time
> cens <- ifelse(survtime > 10, 0, 1) #indicator for censored/observed
> survtime  <- pmin(survtime, 10) #new survival time values with censored
> info
> age <- rnorm(200, 40, 10)  #age variable
> race <- factor(sample(c('a','b'),500,TRUE))  #categorical variable
> test <- bj(Surv(survtime, cens) ~ rcs(age,5) + race)
>
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>
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-- 
Joshua Wiley
Ph.D. Student, Health Psychology
Programmer Analyst II, Statistical Consulting Group
University of California, Los Angeles
https://joshuawiley.com/