Displaying 6 results from an estimated 6 matches for "stanford2".
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stanford
2008 May 09
2
how to check linearity in Cox regression
Hi, I am just wondering if there is a test available for testing if a linear fit of an independent variable in a Cox regression is enough? Thanks for any suggestions.
John Zhang
____________________________________________________________________________________
[[elided Yahoo spam]]
2009 Feb 19
0
Age as time-scale in a cox model
You asked about survival curves with age scale versus follow-up scale.
> fit1 <- coxph(Surv(time/365.25, status) ~ t5 + id + age, data=stanford2)
> surv1<- survfit(fit1)
> surv1
n events median 0.95LCL 0.95UCL
157.000 102.000 1.999 0.898 3.608
> summary(surv1, times=3)
time n.risk n.event survival std.err lower 95% CI upper 95% CI
3 46 85 0.451 0.0425 0.375 0.543
I've t...
2009 Feb 18
1
Age as time-scale in a cox model-How to calculate x-time risk?
Dear R users,
My question is more methodology related rather than specific to R usage. Using time on study as time in a cox model, eg:
library(Design)
stanf.cph1=cph(Surv(time, status) ~ t5+id+age, data=stanford2, surv=T)
#In this case the 1000-day survival probability would be:
stanf.surv1=survest(stanf.cph1, times=1000)
#Age in this case is a covariate.
#I now want to compare the above estimate to the 1000-day survival probability I get using age at entry and exit as my time-scale:
stanf.cph2=cph(Surv...
2007 Jun 08
0
Escobar&Meeker example survreg
...and may make beginner mistakes. Sorry.
I am learning using R to do survival analysis. As a start I used the
example script code provided in the documentation of predict.survreg of
the survival package:
# Draw figure 1 from Escobar and Meeker
fit <- survreg(Surv(time,status) ~ age + age^2, data=stanford2,
dist='lognormal')
plot(stanford2$age, stanford2$time, xlab='Age', ylab='Days',
xlim=c(0,65), ylim=c(.01, 10^6), log='y')
pred <- predict(fit, newdata=list(age=1:65), type='quantile', p=c(.1,
.5, .9))
matlines(1:65, pred, lty=c(2,1,2), col=1)
When I compa...
2003 Mar 30
2
R-devel (1.7 to be) on windows XP
...nal line found by readLines on `C:\R\R17beta\R-
1.7.0\src\library\survival/man/ovarian.Rd'
6: incomplete final line found by readLines on `C:\R\R17beta\R-
1.7.0\src\library\survival/man/rats.Rd'
7: incomplete final line found by readLines on `C:\R\R17beta\R-
1.7.0\src\library\survival/man/stanford2.Rd'
8: incomplete final line found by readLines on `C:\R\R17beta\R-
1.7.0\src\library\survival/man/survival-internal.Rd'
9: incomplete final line found by readLines on `C:\R\R17beta\R-
1.7.0\src\library\survival/man/survreg.control.Rd'
zipping data
.
.
.
stataread.c: In function `R...
2001 Nov 12
2
check() warnings for survival-2.6
...les with unbalanced braces:
* man/Surv.Rd
* man/cluster.Rd
* man/cox.zph.Rd
* man/coxph.Rd
* man/coxph.detail.Rd
* man/date.ddmmmyy.Rd
* man/lines.survfit.Rd
* man/plot.cox.zph.Rd
* man/predict.survreg.Rd
* man/pyears.Rd
* man/residuals.coxph.Rd
* man/stanford2.Rd
* man/strata.Rd
* man/summary.survfit.Rd
* man/survdiff.Rd
* man/survexp.Rd
* man/survfit.Rd
* man/survreg.control.Rd
* man/survsum.Rd
* man/untangle.specials.Rd
2) missing docs:
* checking for undocumented objects ... WARNING
[1] "[.Surv"...