On Wed, Jun 18, 2008 at 9:20 AM, Ana Kolar <[EMAIL PROTECTED]> 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
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
2 matches
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