تعیین اندازهی کارآیی فنی راسل با حضور شاخصهای انعطافپذیر مبتنی بر متغیرهای کمکی
محورهای موضوعی : آمارمجید صدیقی حسنکیاده 1 , صابر ساعتی مهتدی 2 , سهراب کردرستمی 3
1 - گروه ریاضی دانشگاه آزاد اسلامی واحد لاهیجان، لاهیجان
2 - گروه ریاضی دانشگاه آزاد اسلامی واحد تهران شمال، تهران
3 - گروه ریاضی دانشگاه آزاد اسلامی واحد لاهیجان، لاهیجان
کلید واژه: Data Envelopment Analysis, slacks-based measure of efficiency, flexible factors, Binary Programming, Russell's measurement,
چکیده مقاله :
در بسیاری از کاربردهای واقعی تحلیل پوششی دادهها، وضعیت بعضی از شاخصها به عنوان ورودی یا خروجی کاملاً معلوم نیست. یعنی در برخی از موقعیتها، یک شاخص میتواند برای برخی از واحدهای تصمیمگیری نقش ورودی و برای برخی دیگر نقش خروجی داشته باشد. این نوع شاخصها را شاخصهای انعطافپذیر مینامند. برای توسعه مدلهای تعیین نوع شاخصهای انعطافپذیر، در تحلیل پوششی دادهها، در این مقاله مدلی مطرح میشود که به طور همزمان فاکتورهای انقباض ورودیها کمینه و فاکتورهای انبساط خروجیها در اندازهی راسل با حضور شاخصهای انعطافپذیر بیشینه شود. اندازهی مطرح شده در تابع هدف مدل پیشنهادی، خطی است. به عبارت دیگر، رابطهی بین شاخصها را به صورت یک تابع جمعی بیان میکند. در واقع این مدل، غیرخطی بودن تابع هدف اندازهی راسل و اندازهی بهبود یافتهی راسل را ندارد. در پایان، با ارائه مثال، مدل پیشنهادی با مدلهای موجود مشابه مقایسه شده و مزایای آن به بحٍ گذاشته خواهد شد.
The role of some factors is not completely clear as an input or an output in many real applications of Data Envelopment Analysis (DEA). In other words, some Decision Making Units (DMUs) can use a factor as an input while it may play an output role in other DMUs. This type of factors is called flexible factors. In this paper, a model is proposed to develop models of flexible factors type in the DEA model. This model, at the same time, minimizes the inputs contraction factor and maximizes the outputs expansion factor in the Russell efficiency measure, in presence of flexible factors. The proposed measure in objective function is linear. In the other words, the relation between the factors is suggested as an additive function. In fact, the proposed model, in contrast the Russell measure is not nonlinear. By an illustrated example, the proposed model is compared with the existing models.
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