[R] using "cut"

From: J. Scott Olsson <olsson_at_math.umd.edu>
Date: Sat, 26 May 2007 10:09:31 -0400


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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