Efficiency Evaluation of Rental Vehicle Usability in Undesirable Factor Model for Data Envelopment Analysis

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ดวงกมล จุลกะเศียน
ธรินี มณีศรี
ศิรประภา มโนมัธย์

Abstract

The objective of this research is to study and compare the different methods used in data envelopment analysis (DEA) for evaluating efficiency of rental vehicle usability when undesirable factors exist. In this research, data on the use of rental vehicles taken from the 22 government agencies are referred to as the Decision Making Unit (DMU). Such data include the cost of car rentals as an input factor, the entire active distance and the cost of maintenance as a desirable output, and the cost of car repairing after accident as an undesirable output; all mentioned information were gathered from the Information Systems (IS) of government agencies and car rental companies. To evaluate the efficiency on the use of rental vehicles, three methods (i.e. multiplicative inverse method, undesirable outputs as inputs method, and additive inverse method) were used for data evaluation in the DEA model with undesirable factors and the average efficiency scores of all three methods being comparatively analyzed by Analysis of Variance (ANOVA). The results indicate that there is no significant difference (p > 0.05) of the average efficiency scores as evaluated by three different methods. Therefore, it can be concluded that all three methods used in this research are applicable for DEA when evaluating the efficiency in DMU with undesirable factors. Nevertheless, the situations and relevant factors that may be different in each agency should be taken into consideration.

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