I am trying to understand cut so I can divide a list of numbers into 10 group:
0-9.0
10-10.9
20-20.9
30-30.9,
40-40.9,
50-50.9
60-60.9
70-70.9
80-80.9
90-90.9
As I try to do this, I have been playing with the cut function. Surprising the
following for applications of cut give me the exact same groups. This surprises
me given that I have varied parameters include.lowest and right. Can someone
help me understand what include.lowest and right do? I have looked at the help
page, but I don't seem to understand what I am being told!
Thank you,
John
values <- c((0:99),c(0.9:99.9))
sort(values)
c1<-cut(values,10,include.lowest=FALSE,right=TRUE)
c2<-cut(values,10,include.lowest=FALSE,right=FALSE)
c3<-cut(values,10,include.lowest=TRUE,right=TRUE)
c4<-cut(values,10,include.lowest=TRUE,right=FALSE)
cbind(min=aggregate(values,list(c1),min),max=aggregate(values,list(c1),max))
cbind(min=aggregate(values,list(c2),min),max=aggregate(values,list(c2),max))
cbind(min=aggregate(values,list(c3),min),max=aggregate(values,list(c3),max))
cbind(min=aggregate(values,list(c4),min),max=aggregate(values,list(c4),max))
You can run the code below, or inspect the results I got which are reproduced
below:
> cbind(min=aggregate(values,list(c1),min),max=aggregate(values,list(c1),max))
min.Group.1 min.x max.Group.1 max.x
1 (-0.0999,9.91] 0 (-0.0999,9.91] 9.9
2 (9.91,19.9] 10 (9.91,19.9] 19.9
3 (19.9,29.9] 20 (19.9,29.9] 29.9
4 (29.9,39.9] 30 (29.9,39.9] 39.9
5 (39.9,50] 40 (39.9,50] 49.9
6 (50,60] 50 (50,60] 59.9
7 (60,70] 60 (60,70] 69.9
8 (70,80] 70 (70,80] 79.9
9 (80,90] 80 (80,90] 89.9
10 (90,100] 90 (90,100] 99.9
> cbind(min=aggregate(values,list(c2),min),max=aggregate(values,list(c2),max))
min.Group.1 min.x max.Group.1 max.x
1 [-0.0999,9.91) 0 [-0.0999,9.91) 9.9
2 [9.91,19.9) 10 [9.91,19.9) 19.9
3 [19.9,29.9) 20 [19.9,29.9) 29.9
4 [29.9,39.9) 30 [29.9,39.9) 39.9
5 [39.9,50) 40 [39.9,50) 49.9
6 [50,60) 50 [50,60) 59.9
7 [60,70) 60 [60,70) 69.9
8 [70,80) 70 [70,80) 79.9
9 [80,90) 80 [80,90) 89.9
10 [90,100) 90 [90,100) 99.9
> cbind(min=aggregate(values,list(c3),min),max=aggregate(values,list(c3),max))
min.Group.1 min.x max.Group.1 max.x
1 [-0.0999,9.91] 0 [-0.0999,9.91] 9.9
2 (9.91,19.9] 10 (9.91,19.9] 19.9
3 (19.9,29.9] 20 (19.9,29.9] 29.9
4 (29.9,39.9] 30 (29.9,39.9] 39.9
5 (39.9,50] 40 (39.9,50] 49.9
6 (50,60] 50 (50,60] 59.9
7 (60,70] 60 (60,70] 69.9
8 (70,80] 70 (70,80] 79.9
9 (80,90] 80 (80,90] 89.9
10 (90,100] 90 (90,100] 99.9
> cbind(min=aggregate(values,list(c4),min),max=aggregate(values,list(c4),max))
min.Group.1 min.x max.Group.1 max.x
1 [-0.0999,9.91) 0 [-0.0999,9.91) 9.9
2 [9.91,19.9) 10 [9.91,19.9) 19.9
3 [19.9,29.9) 20 [19.9,29.9) 29.9
4 [29.9,39.9) 30 [29.9,39.9) 39.9
5 [39.9,50) 40 [39.9,50) 49.9
6 [50,60) 50 [50,60) 59.9
7 [60,70) 60 [60,70) 69.9
8 [70,80) 70 [70,80) 79.9
9 [80,90) 80 [80,90) 89.9
10 [90,100] 90 [90,100] 99.9
John David Sorkin M.D., Ph.D.
Professor of Medicine
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology and Geriatric
Medicine
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
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