[R] Survplot, Y-axis in percent

[David Winsemius]

On Nov 6, 2012, at 8:10 AM, maziar.mohaddes wrote:

> Hi
> 
> I am a new fan of R after getting mad with the graphical functional in SPSS. 
> I have been able to create a nice looking Kaplan Meyer graph using Survplot
> function. 
> However I have difficulties in turning the y axis to percent instead of the
> default 0-1 scale.
> Further I have tried the function yaxt="n" without any results. Any help in
> this matter will be appreciated. 
> The code is posted below:
> 
> par(mfrow=c(1,1))
> fit <- survfit(Surv(revreg$Tcuprev , revreg$Rcup_n_j_n)~revreg$RAceGrp_1Maz)

Probably better in the future to supply a data argument and then you formula only needs the column names.

> fit
> survplot (fit, col=c("gray1","gray40"), lty=1, lwd = 1,
> col.fill=c("gray50","gray80"), 
>          mark.time= T,  conf="bands" , conf.int=.95, add=F , 
>          xlim=c(0, 20) , time.inc = 4, 
>          ylim=c(0.5, 1), 
>          xlab="Years Postoperative" , ylab="Cumulative Survival
> Probability" , 
>          label.curves=F , abbrev.label=F , 
>          yaxt="n"
>          )

As far as I can see, survplot.survfit (from package rms) is written with base graphics, so you need to suppress the default axis call with yaxt=FALSE, and replace it with your desired values using axis(2, at=..., labels=...). No testing in the absence of data.

> 
> View this message in context: http://r.789695.n4.nabble.com/Survplot-Y-axis-in-percent-tp4648572.html
> Sent from the R help mailing list archive at Nabble.com.

You should also realize that Nabble is not Rhelp.

-- 

David Winsemius, MD
Alameda, CA, USA