[R] Question about survdiff in for-loop.

[Sando]

Hi everyone!!

I have dataset composed of a numbers of survival analyses. 
( for batch survival analyses by using for-loop) . 
Here are code !!

#######
dim(svsv)
Num_t<-dim(svsv)
Num<-Num_t[2]   # These are predictors !!

names=colnames(svsv)

for (i in 1:Num  )
{
name_tt=names[i]
survdiff(Surv(survival.m, survival) ~ names[i], data=svsv)
fit.Group<-survfit(Surv(survival.m, survival) ~ names[i] , data=svsv)
plot(fit.Group, col=2:1, xlab="Survival", ylab="Prob")
}

#####

names[i] is not working in the survdiff. 
According to help R , the predictor must be single subset. 

And, names[i] is also single character, I think. 

But, it do NOT work. 

How I can solve this problem ? 



Thank you. 

 




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