[R] Plotting adjusted KM curve

John Fox j|ox @end|ng |rom mcm@@ter@c@
Mon Apr 5 04:45:41 CEST 2021

Dear John,

I think that what you're looking for is

plot(survfit(fit1Cox, newdata=data.frame(age=rep(65, 2), 
sex=factor("female", "male"))))

assuming, of course, that sex is a factor with levels "female" and "male".

I hope this helps,

John Fox, Professor Emeritus
McMaster University
Hamilton, Ontario, Canada
web: https://socialsciences.mcmaster.ca/jfox/

On 2021-04-04 9:34 p.m., Sorkin, John wrote:
> Colleagues,
> I am using the coxph to model survival time. How do I plot an adjusted Kaplan Meir plot resulting from coxph? The code I would like to run would start with:
> # run cox model
> fit1Cox <- coxph(surv_object ~age+sex,data=mydata)
> I have no idea what would follow.
> I would like to plot adjusted KM curves for men vs. women at age 65.
> Thank you,
> John
> 	[[alternative HTML version deleted]]
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