Hi:
Using your data below as the template,
u <- cut(x, breaks = c(0, seq(1000, 7000, by = 1000)), dig.lab = 4, right =
FALSE)
as.data.frame(table(u))
u Freq
1 [0,1000) 0
2 [1000,2000) 5
3 [2000,3000) 0
4 [3000,4000) 0
5 [4000,5000) 0
6 [5000,6000) 0
7 [6000,7000) 1
It makes no sense to use labels like 0 - 999, 1000 - 1999, etc. when your
values are continuous. If you round or truncate them, you can define cut()
the same way as above and use the labels argument to format the labels as
you wish, something like
labs <- c('0-999', '1000-1999', '2000-2999', '3000-3999', '4000-4999',
'5000-5999', '6000-6999')
v <- cut(x, breaks = c(0, seq(1000, 7000, by = 1000)), labels = labs, right
= FALSE)
as.data.frame(table(v))
HTH,
Dennis
On Thu, Jan 27, 2011 at 6:58 AM, Louise Mair <lm...@york.ac.uk> wrote:
> Hello,
>
> I am working with a dataset which essentially has only one column - a list
> of distances in metres, accurate to several decimal places. eg
>
> distance
> 1000
> 6403.124
> 1000
> 1414.214
> 1414.214
> 1000
>
> I want to organise this into a frequency table, grouping into categories of
> 0 - 999, 1000 - 1999, 2000-2999 etc. I'd also like the rows where there are
> no data points in that category to contain 0, in order to be able to plot a
> histrogram with a linear x axis, and to statistically analyse differences
> between datasets.
>
> I have tried table() which doesn't group the data the way I'd like it,
> I've also tried cut() but couldn't make it work. Ideally I'd like the output
> to look something like this...
>
> distance frequency
> 0-999 0
> 1000-1999 3
> 2000-2999 0
> ...
>
> Any suggestions that are an improvement on doing it manually please?
>
> Thanks in advance!
>
> Louise
>
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
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>
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