From: WeiWei Shi <helprhelp_at_gmail.com>

Date: Sat 23 Apr 2005 - 08:39:36 EST

i<-i+1

}

hist(diff, breaks=300) # analyze the distr of such diff qqnorm(diff)

R-help@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 Received on Sat Apr 23 08:45:19 2005

Date: Sat 23 Apr 2005 - 08:39:36 EST

I happened to have a question in my work:

I have a dataset, which has only one dimention, like

0.99037297527605 0.991179836732708 0.995635340631367 0.997186769599305 0.991632565640424 0.984047197106486 0.99225943762649 1.00555642128421 0.993725402926564 ....

the data is saved in a file called f392.txt.

I used the following codes to play around :)

k<-read.table("f392.txt", header=F) # read into k
kk<-k[[1]]

l<-qqnorm(kk)

diff=c()

lenk<-length(kk)

i=1

while (i<=lenk){

diff[i]=l$y[i]-l$x[i] # save the difference of therotical quantile
and sample quantile

# remember, my sample mean is around 1while the therotical one, 0

i<-i+1

}

hist(diff, breaks=300) # analyze the distr of such diff qqnorm(diff)

my question is:

from l<-qqnorm(kk), I wanted to know, from which point (or cut), the
sample points start to become away from therotical ones. That's the
reason I played around the "diff" list, which gives me the difference.
To my surprise, the diff is perfectly normal. I tried to use some
kk<-c(1, 2, 5, -1 , ...) to test, I concluded it must be some
distribution my sample follows gives this finding.

So, any suggestion on the distribution of my sample? I think there might be some mathematical inference which can leads this observation, but not quite sure.

m s df 9.999965e-01 7.630770e-03 3.742244e+00 (5.317674e-05) (5.373884e-05) (8.584725e-02)

btw2, can anyone suggest a way to find the "cut" or "threshold" from my sample to discretize them into 3 groups: two tail-group and one main group.--------- my focus.

Thanks,

Ed

R-help@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 Received on Sat Apr 23 08:45:19 2005

*
This archive was generated by hypermail 2.1.8
: Fri 03 Mar 2006 - 03:31:22 EST
*