3. An Alternative Dynamic Slack-Based Model
Radial and non-radial are two types of efficiency measurements. The CCR and BCC models present radial efficiency measurements. The slack-based measure of efficiency (SBM) is a non-radial measure of efficiency. The non-radial approach SBM deals with slack directly, but neglects the radial characteristics of inputs and/or outputs. Thus, the SBM measure reflects not only the weak efficiency values in CCR-efficiency but also the other (slack) inefficiencies (Cooper et al., 2007). The SBM deals directly with the input excesses and output shortfalls of the DMUs. However, the SBM measures the effectiveness of DMUs during a single period. It can be misleading to decide on the DMUs’ performance during a single period. An optimization model should include the time change effect. For these cases, dynamic DEA models have been developed. In this study, based on Tone’s (2001) SBM and Lotfi and Poursakhi’s (2012) dynamic DEA model, we develop an alternative dynamic slack-based model (DSBM). SBM by Tone (2001) is given below. In model, the production possibility set P is defined as
3. An Alternative Dynamic Slack-Based Model
Radial and non-radial are two types of efficiency measurements. The CCR and BCC models present radial efficiency measurements. The slack-based measure of efficiency (SBM) is a non-radial measure of efficiency. The non-radial approach SBM deals with slack directly, but neglects the radial characteristics of inputs and/or outputs. Thus, the SBM measure reflects not only the weak efficiency values in CCR-efficiency but also the other (slack) inefficiencies (Cooper et al., 2007). The SBM deals directly with the input excesses and output shortfalls of the DMUs. However, the SBM measures the effectiveness of DMUs during a single period. It can be misleading to decide on the DMUs’ performance during a single period. An optimization model should include the time change effect. For these cases, dynamic DEA models have been developed. In this study, based on Tone’s (2001) SBM and Lotfi and Poursakhi’s (2012) dynamic DEA model, we develop an alternative dynamic slack-based model (DSBM). SBM by Tone (2001) is given below. In model, the production possibility set P is defined as
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3. An Alternative Dynamic Slack-Based Model
Radial and non-radial are two types of efficiency measurements. The CCR and BCC models present radial efficiency measurements. The slack-based measure of efficiency (SBM) is a non-radial measure of efficiency. The non-radial approach SBM deals with slack directly, but neglects the radial characteristics of inputs and/or outputs. Thus, the SBM measure reflects not only the weak efficiency values in CCR-efficiency but also the other (slack) inefficiencies (Cooper et al., 2007). The SBM deals directly with the input excesses and output shortfalls of the DMUs. However, the SBM measures the effectiveness of DMUs during a single period. It can be misleading to decide on the DMUs’ performance during a single period. An optimization model should include the time change effect. For these cases, dynamic DEA models have been developed. In this study, based on Tone’s (2001) SBM and Lotfi and Poursakhi’s (2012) dynamic DEA model, we develop an alternative dynamic slack-based model (DSBM). SBM by Tone (2001) is given below. In model, the production possibility set P is defined as
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