[R] using "cut"

[David Barron]

You can split a vector into groups with equal numbers using the
quantcut function in the gtools package.  For example, to split into
two groups, use:

c <- quantcut(y,c(0,.5,1))

On 26/05/07, J. Scott Olsson <olsson at math.umd.edu> wrote:
> Suppose I have some data
>
> >x <- rnorm(1000);
> >y <- x*x;
>
> then try to cut it into 2 chunks,
>
> >c <- cut(y, breaks=2);
>
> >summary(y)
>  Min.   1st Qu.    Median      Mean   3rd Qu.      Max.
> 6.879e-06 9.911e-02 3.823e-01 9.499e-01 1.297e+00 8.342e+00
>
> >summary(c)
> (-0.00833,4.17]     (4.17,8.35]
>             958              42
>
> Is that the correct behavior? Why is the left hand side of the interval
> negative?
>
> How would I split a data vector into groups/intervals such that each
> interval contained the same number of points?
>
>
> Thanks much!
> Scott
>
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>
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-- 
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David Barron
Said Business School
University of Oxford
Park End Street
Oxford OX1 1HP