[R] Survplot, Y-axis in percent

[Frank Harrell]

Don't change the code.  Just use survplot(..., fun=function(y)100*y,
ylim=c(0,100)).
But note that percent is not recommended as it is more confusing than
proportions, especially when talking about differences in percents.
Frank

Andrews, Chris wrote
> It doesn't look like 'survplot' allows you to control the yaxis formatting
> in that way.  You can edit the function survplot.survfit directly if you
> really need to: fix(survplot.survfit).  The relevant line to change is (I
> believe) mgp.axis(2, at = pretty(ylim)) to mgp.axis(2, at = pretty(ylim),
> labels= 100*pretty(ylim)).  However, if you are new to R this could cause
> you more trouble than you want.
> 
> Alternatively, you can use 'plot' with the yaxt="n" option. e.g.,
> mod <- survfit(Surv(time,status)~ph.ecog, data=lung)
> plot(mod, yaxt="n", col=1:4, ylab="Survival Percent", xlab="Days",
> main="Lung Cancer Data\nEffect of ph.ecog on Survival")
> axis(2, at=seq(0,1,0.2), labels=paste(seq(0,100,20), "%", sep=""), las=1)
> 
> But that doesn't have all the other stuff you appear to want (e.g., shaded
> confidence bands).
> 
> Good luck,
> Chris
> 
> -----Original Message-----
> From: maziar.mohaddes [mailto:

> maziar.mohaddes@

> ] 
> Sent: Tuesday, November 06, 2012 11:11 AM
> To: 

> r-help@

> Subject: [R] Survplot, Y-axis in percent
> 
> 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)
> 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"
>           )
> 
> 
> 
> 
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-----
Frank Harrell
Department of Biostatistics, Vanderbilt University
--
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