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Given a set of input factors, and a set of output factors, for each decision making unit (DMU), i, find a set of weights for the factors so as to maximize efficiency score of i = (wgted outputs)/(wgted inputs) subject to: (wgted outputs)/(wgted inputs) <= 1, for all DMU k, including i, or equivalently: (wgted outputs) <= (wgted inputs) <= 1; A DMU with a score of 1 is said to be efficient or undominated.