Camanho, AnaVaz, Clara B.2010-11-162010-11-162005Camanho, Ana; Vaz, Clara B.(2005) - Assessing group performance with Malmquist indices: the evaluation of the brand effect in retailing. In IFORS Triennial Conference. Hawaiihttp://hdl.handle.net/10198/2816This study explores the differences in performance between two groups of grocery stores with different brands. The paper develops a Malmquist-type index to distinguish internal inefficiencies from those associated with the group (or brand) characteristics. A fundamental characteristic of the new index is to compare in a static setting.engData envelopment AnalysisMalmquist indexconference object