Have you read FAQ 7.31 recently, John? Your whole premise is flawed. You should
be thinking of ranges [0,10), [10,20), and so on because numbers ending in 0.9
are never going to be exact.
--
Sent from my phone. Please excuse my brevity.
On April 16, 2016 7:38:50 PM PDT, John Sorkin <jsor...@grecc.umaryland.edu>
wrote:
>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)
>
>Confidentiality Statement:
>This email message, including any attachments, is for t...{{dropped:15}}
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