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        1 - Efficiency analysis in multi-stage network DEA-R models
        Mohammad Reza Mozaffari masoud Sanei josef jablonsky
        In many organizations and financial institutions, it is in many cases more cost and time efficient to access ratio data. Therefore, it is of great importance to evaluate the performance of decision-making units (DMUs) which only have access to ratios of inputs to output More
        In many organizations and financial institutions, it is in many cases more cost and time efficient to access ratio data. Therefore, it is of great importance to evaluate the performance of decision-making units (DMUs) which only have access to ratios of inputs to outputs or vice versa (for instance, ratio of employees to students, ratio of assets to liabilities and ratio of doctors to patients). In this paper, we will propose two-stage network DEA-R model with multi-objective linear programming (MOLP) structures. Then, introducing a production possibility set (PPS) in each network stage, we will compare efficiency values in network DEA and DEA-R. In the end, through an applied study on 22 medical centers which treat special patients in three stages, we will suggest an output-oriented multi-stage network DEA-R model under assumption of CRS technology. The medical centers are evaluated in all three stages based on overall network efficiency. The results of the analysis are presented and a future research in this field is discussed in the final section of the paper. Manuscript profile
      • Open Access Article

        2 - Analysis of returns to scale and efficiency in the financial performance of listed petrochemical companies by DEA method
        Saeid Rezaeilava Mirfeiz Fallah Shams Layalestani Masoud Sanei shokoofeh BaniHashemi
        One of the components of large companies that, with the support of their competent and efficient managers, are analyzing the capital market, raw materials and products every day, is an accurate calculation tool to advance future goals.After the end of financial periods More
        One of the components of large companies that, with the support of their competent and efficient managers, are analyzing the capital market, raw materials and products every day, is an accurate calculation tool to advance future goals.After the end of financial periods and through news and media, announcements of profit and loss, balance sheet and earnings per share and finally changes in stock prices of companies in the capital market are provided to us. Obviously, companies that have achieved better profitability rates and have increased the value of investor stocks have a better position in this market, and other companies have the ability to gain points that have led to positive changes in the market. They maintain their competition to achieve much higher.In this paper, the financial information of 10 petrochemical companies that are members of the stock exchange for 11 consecutive years is classified by performance appraisal techniques and finally, according to the market analysis and methods used, the results related to the returns of these companies are classified. Has been. Manuscript profile