[R] correlation with boot

[Prof Brian Ripley]

Please look at the help for boot, in particular what it says the form of 
'statistic' should be.  Possibly what you want is

corr.t <- function(data, ind) cor(data[ind,])[1,2]

nlaw appears to be a single-column matrix: that will not work either.

On Mon, 1 Sep 2008, ctu at bigred.unl.edu wrote:

> Hi R users,
> I have one simple question but I really don't know why I can't get it work.
> The data was adopted from Efron's An introduction to the bootstrap book.
>> nlaw
>     LSAT  GPA
> [1,]  576 3.39
> [2,]  635 3.30
> [3,]  558 2.81
> [4,]  578 3.03
> [5,]  666 3.44
> [6,]  580 3.07
> [7,]  555 3.00
> [8,]  661 3.43
> [9,]  651 3.36
> [10,]  605 3.13
> [11,]  653 3.12
> [12,]  575 2.74
> [13,]  545 2.76
> [14,]  572 2.88
> [15,]  594 2.96
>> nlaw<-as.matrix(law[,-1])
>> corr.t<-function(data){
> +        return(boot::corr(data))
> +        }
>> law.boot<-boot(data=nlaw,statistic=corr.t,R=49)
> Error in statistic(data, original, ...) : unused argument(s) (1:15)
>
> many thanks for the help
> Chunhao
>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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