| Summary: | 博士 === 國立交通大學 === 工業工程與管理學系 === 99 === DEA is one of the most representative methods of efficiency evaluation and weight is a popular issue in DEA field. A new DEA model, DEA-R, had been developed for avoiding needless weight restriction, which causes the expression problem of specific input-output relationship. But some issue about DEA-R need to be discussed. So this article developed the input-oriented DEA-R and proved the validity of DEA-R through new defined efficient frontier. In addition, this article found that needless weight restriction causes not only the expression problem but also underestimation of efficiency and pseudo-inefficiency. Finally, this article converts the optimal weight to analyze the influences of needless weight restrictions. The result showed that the underestimations of efficient DMUs are bigger than in-efficient DMUs and the needless weight restriction really causes underestimation. Because input-oriented DEA-R is a valid model and excludes needless weight restriction, input-oriented DEA-R is a good substitued model for input-oriented CCR.
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