R help - Dec 2005 - boot problem

Hello,
This is the code that is giving me problems
>library(boot)
>data<-read.table("test",header=FALSE,sep="\t",row.names=1)
>data
          V2 V3 V4
A  5  8  9
B 12 54 89
C   65 89 23
D   32 69 44
E   21 84 97
F   33 59 71
G   16 45 93
H    2 46 55
I   22 33 88
>resample <- function(x,index) {
sample(data,replace=TRUE)
}
dist<-boot(data,resample,R=1000)
Erreur : nombre d'indices incorrect sur la matrice (french)
Error: number of indices wrong in the matrix (moreless)

Can anybody help???

Your 'resample' function is not written according to the help page.  Try

resample <- function(x, index) { x[index, ] }

-roger

david v wrote:
> Hello,
> This is the code that is giving me problems
> 
> 
>>library(boot)
>>data<-read.table("test",header=FALSE,sep="\t",row.names=1)
>>data
> 
>           V2 V3 V4
> A  5  8  9
> B 12 54 89
> C   65 89 23
> D   32 69 44
> E   21 84 97
> F   33 59 71
> G   16 45 93
> H    2 46 55
> I   22 33 88
> 
> 
>>resample <- function(x,index) {
> 
> sample(data,replace=TRUE)
> }
> dist<-boot(data,resample,R=1000)
> Erreur : nombre d'indices incorrect sur la matrice (french)
> Error: number of indices wrong in the matrix (moreless)
> 
> Can anybody help???
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
> 
-- 
Roger D. Peng  |  http://www.biostat.jhsph.edu/~rpeng/

What are you trying to do?  boot does the resampling for you so you should 
pass the statistic that you want calculated on the resamples.  Read the 
helpfile regarding the format of the statistic.  It should take two 
arguments, one of which is a vector of indices specifying the resample.

On Tue, 20 Dec 2005, david v wrote:
> Hello,
> This is the code that is giving me problems
> 
> >library(boot)
>
>data<-read.table("test",header=FALSE,sep="\t",row.names=1)
> >data
>           V2 V3 V4
> A  5  8  9
> B 12 54 89
> C   65 89 23
> D   32 69 44
> E   21 84 97
> F   33 59 71
> G   16 45 93
> H    2 46 55
> I   22 33 88
> 
> >resample <- function(x,index) {
> sample(data,replace=TRUE)
> }
> dist<-boot(data,resample,R=1000)
> Erreur : nombre d'indices incorrect sur la matrice (french)
> Error: number of indices wrong in the matrix (moreless)
> 
> Can anybody help???
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
> 
-- 
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