On Sep 13, 2008, at 4:21 PM, Celia Chen wrote:
Thank you Jim.
Here I creat an example: A<-c(1.1,1.2,2.2,1.3, 1.5, 2.5)
B<-c(2.2,2.3,2.4,2.2, 2.0,1.9,
2.5)
I will need to draw the parallel stem-and-leaf displays to show the
difference in trend/pattern between the two data patches.
And I think parellel stem-and-leaf displays by Tukey means that the
two
displays share the same stem, but different leaves. And I don't
think there
is an R command for this.
In addition, I am confused by another problem in stem-and-leaf
display that
is done by R.
Here it is :
Y<-c(12,15,15,10,13,15,14,8,11,9,14,9,13,14,12,16,15,13,12,12,9)
y<-Y/100
stem.leaf(y,0.01)
1 | 2: represents 0.12
leaf unit: 0.01
n: 21
1 s | 7
4 0. | 999
10 1* | 002222
(3) t | 333
8 f | 44444445
This result is quite confusing, cos the smallest leaf should be "8"
rather
than "7", plus there is non "7" in the dataset. And more over, there
is no
"16" shown in the last line of leaves.
If anyone knows what's going on here, please let me know. Thank you!
This function in a non-core package, aplpack, so it is not R that is
"doing" this, but that particular function. If you don't want to look
through the code yourself, you could contact the package maintainer,
which the help pages say is:
Author(s)
Peter Wolf Maintainer: Peter Wolf <[EMAIL PROTECTED]>
A possible hint to what might be happening is that stem.leaf(y, 0.001)
produces results are probably more to your liking:
> stem.leaf(y, 0.001)
1 | 2: represents 0.012
leaf unit: 0.001
n: 21
1 8 | 0
4 9 | 000
5 10 | 0
6 11 | 0
10 12 | 0000
(3) 13 | 000
8 14 | 000
5 15 | 0000
1 16 | 0
--
David Winsemius, MD
Heritage Laboratories
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