In this study, the window network data envelopment analysis (WNDEA) model will be proposed, that is capable to be used in the presence of panel data. Additionally, the proposed model is applied to evaluate the dynamic efficiency of 5 investment companies in Tehran stock exchange during the period from 2013 to 2017.

electronic commerce as one of the most important of innovation aspects in the process of doing business is used by many organizations and companies in the world. cooperatives as the main part of the country's economy have fundamental role in improving and promoting of economic. therefore, innovation methods and tools, new processes and perform business tasks such as e-commerce will play an impo...

in this paper, a novel approach for multi response optimization is presented. in the proposed approach, response variables in treatments combination occur with a certain probability. moreover, we assume that each treatment has a network style. because of the probabilistic nature of treatment combination, the proposed approach can compute the efficiency of each treatment under the desirable reli...

in this article, non radial method of dynamic dea with the parallel network structure is presented and is used for calculation of relative efficiency measures when inputs and outputs do not change equally. in this model, dmu divisions under evaluation have been put together in parallel. but its dynamic structure is assumed in series. since in real applications there are undesirable inputs and o...

in many european states such as spain and italy there has been a significant growth of organic utilizable surface as a consequence of both a change in the model of agricultural production and also in order to satisfy arising demand of organic food. the purpose of this research was to investigate the level of technical, allocative and economic efficiency in italian olive farms with two different...

in addition to its primary role of providing financial protection for other industries the insurance industry also serves as a medium for fund mobilization. in spite of the harsh economic environment in nigeria, the insurance industry has been crucial to the consummation of business plans and wealth creation.  however, the continued downturn experienced by many countries, in the last decade, se...

in recent years, the existing competitions between investment companies have been increased largely by entering private investors in capital market. large and powerful companies try to achieve the goals predicted to increase the competition capacity. to analyze the efficiency of investment companies, parametric and non-parametric methods are used. in this research, based on the dissociation pow...

in this study the wavelet neural network (wnn) and artificial neural network (ann) were used to simulate barley breakage percentage in combine harvester. the models have been trained using the same data conditions. air temperature, thresher cylinder speed, distance between thresher cylinder and concave (back and forth) and the percentage of barely moisture were as the input variables. the resul...