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The recent study by [Mehdiloozad, Mirdehghan, Sahoo, & Roshdi (2015) On theidentification of the global reference set in data envelopment analysis. EJOR,245, 779-788] proposes a linear programming (LP) model for the problem offinding the global reference set (GRS) of the evaluated decision making unit(DMU). This technical note revisits the problem and reformulates it as a mixed0-1 LP model. By applying the LP relaxation method, it then transforms theformulated model into an equivalent LP model. Finally, it shows that theresulting LP model is equivalent to the LP model of Mehdiloozad et al. (2015).

Identifying the global reference set in DEA: A mixed 0-1 LP formulation with an equivalent LP relaxation