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2011 Jan 23
2
select a subset from a sample
Dear all,
I would like to ask whether anyone has experience with the problem below.
I want to select a subset of the sample (see data below) so that each level
(1,2,3,4 in the example) for every variable (v1,v2,v3,v4 in the example) is
shown at least once in the subset. I also want the sample size of the
subset to be as small as possible. Any help on it is greatly appreciated.
Id v1 v2