- (2008) is to use the software program Qhull. However, this program is not developed exclusively for DEA and it is not always easy to use in DEA applications (see Aparicio et al., 2007; Zhu et al., 2022).
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Allen, R., Athanassopoulos, A., Dyson, R.G., & Thanassoulis, E. (1997). Weights restrictions and value judgements in data envelopment analysis: evolution, development and future directions. Annals of Operation Research, 73, 13-34.
- An alternative advocated by Olesen and Petersen (2003) and Thanassoulis et al.
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- Charnes et al. (1990) used weight vectors with strictly positive components to construct the cone of feasible weights in their application. On the other hand, Brockett et al. (1997) included weight vectors containing zero components as well. We limit our discussion to input-oriented DEA models. The extension of the results to output oriented models is straightforward.
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- Endnotes As model DMUs are considered DEA-efficient DMUs that are viewed as exceptional performers by the DM (Charnes et al., 1990). Agreement on the set of model banks may be unanimous or not, as DMs might have diverging views on what constitutes good performance, or the chosen banks are viewed as different types of examples to follow. From now on, when a quotation is used, the words in brackets and the underlying are our own additions.
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- See Olesen and Petersen (1996) for a formal definition of FDEFs and non-FDEFs and Olesen and Petersen (2015) for an interesting discussion on alternative definitions of efficient facets. Linear models that test for the existence of at least one FDEF in the CRS or VRS DEA models are given in Olesen and Petersen (2015). For a set of ℛ extreme-efficient DMUs, one may investigate whether these jointly generate at least one FDEF by identifying all the FDEFs of the DEA frontier. The CRS counterpart of model (6) is obtained by removing the free variable ζ.
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Talluri, S., & Yoon, K.P. (2000). A cone-ratio DEA approach for AMT justification. International Journal of Production Economics, 66, 119-129.
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- The CRS counterpart of model (15) is provided in Olesen and Petersen (2015, p. 168) and can be obtained by removing the free variable ?? and changing the right-hand side in the fourth constraint to ? − (? + ? − 1). As in most cases not all the DMUs in ? are jointly efficient, it frequently holds that ℛ? ⊂ ?. However, in rare cases there is a facet jointly generated by all the DMUs in ?, in which case ℛ? ≡ ? can be a valid choice.
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- The CRS counterpart of model (8) is given in Olesen and Petersen (2003) and can be obtained by removing the free variable z. See their footnote 7 in which they noted that weights normal to facets that are not of full dimension could also be included in W.
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- This CR-DEA variant is related to the Extended Facet (EXFA) efficiency model developed by Olesen and Petersen (1996, 2015), for evaluating efficiency relative to a technology spanned by FDEFs and the extensions of these facets; see their relations (6.27) and (6.40), and footnote 21 in Olesen and Petersen (2015, pp. 167-170).
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Thompson, R.G., Dharmapala, P.S., & Thrall, R.M. (1995). Linked-cone DEA profit ratios and technical efficiency with application to Illinois coal mines. International Journal of Production Economics, 39, 99-115.
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- Zhu, J. (1996). DEA/AR analysis of the 1988-1989 performance of the Nanjing textiles corporation. Annals of Operations Research, 66, 311-335.
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