correlation with boot
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 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? 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. Appreciate, Chunhao Quoting Prof Brian Ripley <ripley at stats.ox.ac.uk>:
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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