On Tue, 2 Sep 2008, [EMAIL PROTECTED] wrote:
Hi Professor Ripley,
(Thank you very much)^infinite for your response. I still have few questions
1. R shows that I have two column in nlaw data.
ncol(nlaw)
[1] 2
corr(nlaw)
[1] 0.7763745
Since we don't have law, we don't know what nlaw is: you recomputed it
after listing it.
2. Why can't I use boot::corr? I check corr in boot package and it seems to
be used for computing correlation coefficient,right?
You can, but you need to use it correctly. I gave you one suggestion that
most people find simpler to understand.
3. The last question, cor is for computed the correlation variance and
covariance matrix. Would you give a explanation for cor(data[ind,])[1,2]
I do not get it.
Try the pieces for yourself. What does cor(nlaw) give? cor(nlaw)[1,2]?
Appreciate,
Chunhao
Quoting Prof Brian Ripley <[EMAIL PROTECTED]>:
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, [EMAIL PROTECTED] 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, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
