bootstrapping code in R doesn't work? -

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so ready jump off building because cannot figure out code life. everytime run it, standard error of 0 (bias=0 too) i'm doing wrong because it's using same sample when want 1000 iterations.

i want aic of model these samples. i've created data frame , named "d."

here code:

bootaic<-function(d, idx){ d2<-d[idx,] fit<-coxph(surv(time,infection) ~ x48fl + x55fl, method="efron", data=d) return(aic(fit)) }  bootf<-boot(data=d,statistic=bootaic,r=1000)

what wrong. appreciate , help, novice bootstrapping , suck @ coding.


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