[R] How to create strata out of the data.frame table

[hadley wickham]

On Wed, Jun 18, 2008 at 9:20 AM, Ana Kolar <annakolar28 at gmail.com> wrote:
> My data.frame table consist of 3 variables (x,y and z) where each variable
> has 1000 units. I need to create 5 equal size strata according to one of the
> variable (let's say x) whereas units of x variable with a higher value have
> higher probability to be selected in a strata with a higher number (max
> strata number is 5).

Could you be a little more precise about the desired distribution
within the slices?  For example, one way to solve your problem as
specified would be to sort the data frame by x, and chop the data
frame into five equal pieces.  Would that be a valid solution to your
problem?

Hadley

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