Islamic Azad University, Rasht BranchIranian Journal of Optimization2588-572303120091001COMMON WEIGHTS DETERMINATION IN DATA ENVELOPMENT ANALYSIS199210513956ENAlireza AmirteimooriDepartment of Mathematics, Islamic Azad University, Rasht Branch, IranSohrab KordrostamiDepartment of Mathematics, Islamic Azad University, Lahijan Branch, Iran.Journal Article20090825<span>In models of data envelopment analysis (</span><span>DEA</span><span>), an optimal set of weights is generally assumed to represent the assessed decision making unit (</span><span>DMU</span><span>) in the best light in comparison to all the other </span><span>DMU</span><span>s, and so there is an optimal set of weights corresponding to each </span><span>DMU</span><span>. The present paper, proposes a three stage method to determine one common set of weights for decision making units. Then, we use these weights to rank efficient units. We demonstrate the approach by applying it to rank gas companies. </span>http://ijo.iaurasht.ac.ir/article_513956_0b5f2e6da337d2a12c9a1d9ec414a9d9.pdf