排序方式: 共有21条查询结果,搜索用时 187 毫秒
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K. Kosmidou F. Pasiouras M. Doumpos C. Zopounidis 《Central European Journal of Operations Research》2006,14(1):25-44
Further consolidation takes place not only among UK banks but also across borders, since some banks see size as a key factor
in remaining competitive in international markets. Therefore, it is interesting to investigate the effectiveness and performance
of UK banks. Based on their assets, banks are distinguished into small and large ones and a classification of UK banks in
a multivariate environment for the period 1998–2002 takes place. The PAIRCLAS multicriteria methodology is employed to investigate
the performance of UK small and large banks over multiple criteria, such as asset quality, capital adequacy, liquidity and
efficiency/profitability. A comparison with discriminant analysis (DA) and logistic regression (LR) facilitates the investigation
of the relative performance of PAIRCLAS against them. The results of the study determine the key factors that specify the
classification of a bank as small or large and provide us with the responsible banking decision makers for future readjustments. 相似文献
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Doumpos Michalis Papastamos Dimitrios Andritsos Dimitrios Zopounidis Constantin 《Annals of Operations Research》2021,306(1-2):415-433
Annals of Operations Research - Automated valuation models are widely used in real estate to provide estimates for property prices. Such models are typically developed through regression... 相似文献
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George Fragkiadakis Michael Doumpos Constantin Zopounidis Christophe Germain 《Annals of Operations Research》2016,247(2):787-806
The continuous growth of hospital costs has driven governments in many countries to seek ways to improve their efficiency. In Greece, this has consistently been a major issue for almost two decades, as efficiency assessment and monitoring systems are lacking. In response to this need, the evaluation of the National Health System hospitals’ efficiency level is a precondition for planning, implementing and monitoring any promising reform. In this paper, a non-parametric modeling approach is employed to assess and analyze the efficiency of 87 Greek public hospitals over the period 2005–2009, using data envelopment analysis. The operational and economic aspects of the hospitals’ operation are considered on the basis of their service/case mix and cost structure. We also investigate the efficiency trends over time with the Malmquist index and a second stage regression analysis is performed to explain the operational and economic efficiency results in terms of the hospitals’ operating characteristics and the environment in which they operate. 相似文献
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Yannis Marinakis Magdalene Marinaki Michael Doumpos Nikolaos Matsatsinis Constantin Zopounidis 《Annals of Operations Research》2011,188(1):343-358
Cluster analysis is an important tool for data exploration and it has been applied in a wide variety of fields like engineering,
economics, computer sciences, life and medical sciences, earth sciences and social sciences. The typical cluster analysis
consists of four steps (i.e. feature selection or extraction, clustering algorithm design or selection, cluster validation
and results interpretation) with feedback pathway. These steps are closely related to each other and affect the derived clusters.
In this paper, a new metaheuristic algorithm is proposed for cluster analysis. This algorithm uses an Ant Colony Optimization
to feature selection step and a Greedy Randomized Adaptive Search Procedure to clustering algorithm design step. The proposed
algorithm has been applied with very good results to many data sets. 相似文献
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Michael Doumpos Constantin Zopounidis Emilios Galariotis 《European Journal of Operational Research》2014
Recent research on robust decision aiding has focused on identifying a range of recommendations from preferential information and the selection of representative models compatible with preferential constraints. This study presents an experimental analysis on the relationship between the results of a single decision model (additive value function) and the ones from the full set of compatible models in classification problems. Different optimization formulations for selecting a representative model are tested on artificially generated data sets with varying characteristics. 相似文献
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The classification problem is of major importance to a plethora of research fields. The outgrowth in the development of classification methods has led to the development of several techniques. The objective of this research is to provide some insight on the relative performance of some well-known classification methods, through an experimental analysis covering data sets with different characteristics. The methods used in the analysis include statistical techniques, machine learning methods and multicriteria decision aid. The results of the study can be used to support the design of classification systems and the identification of the proper methods that could be used given the data characteristics. 相似文献
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The development of credit risk assessment models is often considered within a classification context. Recent studies on the
development of classification models have shown that a combination of methods often provides improved classification results
compared to a single-method approach. Within this context, this study explores the combination of different classification
methods in developing efficient models for credit risk assessment. A variety of methods are considered in the combination,
including machine learning approaches and statistical techniques. The results illustrate that combined models can outperform
individual models for credit risk analysis. The analysis also covers important issues such as the impact of using different
parameters for the combined models, the effect of attribute selection, as well as the effects of combining strong or weak
models. 相似文献