[R] Grouping

From: Judith Flores <juryef_at_yahoo.com>
Date: Thu, 24 Jan 2008 14:21:05 -0800 (PST)

I need to group some subjects according to two variables (var1, var2)

I have a data frame that looks something like this:

Subject var1 var2

1         400    150         
2         320    100     
3         580    600     
4         145    789     


  Each suject would fall into one of 2 categories ('A' or 'B'). I want to find (and see) all the possible combinations of letter assignment that exist, but every combination needs to have an equal amount of subjects categorized as 'A' or 'B'(eg. if I have 20 subjects there should be 10 assigned with letter 'A' and 10 with letter 'B')

Thank you in advance for any hints,


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