Mohammad Mahdi Bahrololoum; Mirfeiz Fallahshams; Ghasem Blue
Volume 13, Issue 39 , January 2016, , Pages 91-114
Abstract
In this study, the strategy of effective asset allocation under uncertainty with the capability of risk control, transaction cost reduction and favorable return realization is investigated. In order to implement this strategy and to overcome the shortfalls of classic portfolio optimization models in ...
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In this study, the strategy of effective asset allocation under uncertainty with the capability of risk control, transaction cost reduction and favorable return realization is investigated. In order to implement this strategy and to overcome the shortfalls of classic portfolio optimization models in dealing with uncertainty, the formation of an index fund using a robust approach and considering cardinality constraint became the agenda. Accordingly, in order to solve the index tracking problem, a linear programming model as minimizing the absolute deviation between the expected return of the index fund and that of the benchmark is presented. Considering the dimension of the solution space, a Meta heuristic genetic algorithm was implemented to solve the robust counterpart of the problem. The results of the analysis imply on the selection of 20 stocks as the index fund composition and indicate good performance of the index tracking funds based on criteria such as correlation, root mean square error and the excess return using out of sample data.
ali seyyed naghavi; mohammad mahdi bahrololoum
Volume 11, Issue 28 , April 2013, , Pages 137-158
Abstract
One of the effective key factors in differentiating and outrunning competitors is the continuous delivery of superior quality to the customers. The secret of success is meeting or getting ahead of customer’s expectations in relation to service quality. By considering the fact that service quality ...
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One of the effective key factors in differentiating and outrunning competitors is the continuous delivery of superior quality to the customers. The secret of success is meeting or getting ahead of customer’s expectations in relation to service quality. By considering the fact that service quality plays an important role in the success of today’s organizations, this article pursues the purpose of investigating the dimensions that have effect on technical services quality of petrochemical commercial company’s sale engineering department, determining the most important service quality dimensions, measuring the gaps existing in the service delivery system and finally promoting and improving the current status of the system. We used the Servqual Model to assess the quality of the services. In this study we tried to customize the model to adapt the specific conditions of the organization, so the Tangibles dimension of the standard model was replaced with service variety and confirmatory factor analysis approach was used to examine the theoretical model of the study. The modified model was analyzed by Lisrel and its validity was confirmed from a statistical point of view. The results of data analysis by SPSS showed that the sale engineering department’s service delivery system was encountered with problems and so the existence of service gaps was proved. Finally practical solutions were provided to promote the service quality and improve the current status of the system
