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41.
Dimitris Georgoutsos 《Applied economics》2013,45(9):1009-1015
The intertemporal maximization problem of the firm under adjustment costs for its factors of production and imperfect competition in the output market is considered. The first-order conditions, with respect to capital and labour, the production function and the demand equation have been jointly estimated using Greek manufacturing data and values for the structural parameters have been obtained. The estimates are plausible and most of them significant. Tests of the overidentifying restirctions are unable to reject the overall specification of the model at conventional levels of significance. 相似文献
42.
Dimitris K. Christopoulos John Loizides Efthymios G. Tsionas 《Applied economics》2013,45(10):1193-1199
This study investigates the long run relationship between government size and unemployment rate, the Abrams curve, using ten European countries over the period 1961–1999. To this end, panel cointegration analysis and estimation techniques appropriate for heterogeneous panels are made use of. The results support the idea that there is an Abrams curve, and the relation between government size and the unemployment rate is positive. 相似文献
43.
Chatzopoulou Erifili-Christina Manolopoulos Dimitris Agapitou Vasia 《Journal of Business Ethics》2022,179(3):795-817
Journal of Business Ethics - We bring together social identity and social exchange perspectives to develop and test a moderated mediation model that sheds light on employees’ perceptions... 相似文献
44.
Dimitris Bourantas Nancy Papalexandris 《International Journal of Human Resource Management》2013,24(5):858-869
Based on data collected from public and private organizations in Greece, this paper examines the differences in individual traits between public and private-sector employees, differences which eventually influence employees' attitudes and behaviours towards their organizations and their consequent performance, specifically in organizational commitment and neglect behaviour. The findings indicate that there are some differences between the two groups of employees. In only three out of ten personality characteristics examined here (security needs, pay needs and Protestant work ethic), are there no distinctions between the groups. These findings imply that, besides the environmental and structural characteristics of the two sectors which may be the source of attitudinal differences, it might also be that persons attracted to the public sector have different personality characteristics from those attracted to the private sector. Regardless of the source of differences, results point to the need for changing recruitment and selection practices in public organizations as well as for implementing a number of human resource management practices, the lack of which seems to drive junior qualified staff away from the public sector where they are mostly needed. The later seems to be the case in Greece where the lower pay and the non-competitive, non-challenging atmosphere prevailing in most public-sector organizations seem to play an important role in driving most dynamic employees away from the public sector. 相似文献
45.
We deal with general mixture of hierarchical models of the form m(x) = fø f(x |θ) g (θ)dθ , where g(θ) and m(x) are called mixing and mixed or compound densities respectively, and θ is called the mixing parameter. The usual statistical application of these models emerges when we have data xi , i = 1,…,n with densities f(xi |θi ) for given θi , and the θ1 are independent with common density g(θ) . For a certain well known class of densities f(x |θ) , we present a sample-based approach to reconstruct g(θ) . We first provide theoretical results and then we use, in an empirical Bayes spirit, the first four moments of the data to estimate the first four moments of g(θ) . By using sampling techniques we proceed in a fully Bayesian fashion to obtain any posterior summaries of interest. Simulations which investigate the operating characteristics of our proposed methodology are presented. We illustrate our approach using data from mixed Poisson and mixed exponential densities. 相似文献
46.
Jarmo Harno K. R. Renjish Kumar Thor Gunnar Eskedal Rima Venturin Dimitris Katsianis Dimitris Varoutas 《NETNOMICS》2007,8(1-2):5-23
Three business case scenarios in the context of emerging mobile access network technologies and business players have been studied and the economical results are presented. The aim is to cover some of the most interesting business alternatives in providing the new 3G and beyond services including cases where the operator may have an existing second-generation cellular network or not, and a license for the 3G UMTS network or not. The scenarios have been analyzed in different Western European country groups that are not exactly representative of any defined country, but rather share typical demographic characteristics. Investments and operational expenditures are identified and the results show how diverse business models and technologies lead to different revenue, cost, and profitability profiles. The business case scenarios include incumbent’s 3G evolution with UMTS compared to an alternative 3G technology deployment with mobile WiMAX, new entrant’s UMTS deployment business case, and a greenfield CDMA450 deployment business case. 相似文献
47.
FORECASTING INFLATION USING DYNAMIC MODEL AVERAGING* 总被引:1,自引:0,他引:1
We forecast quarterly US inflation based on the generalized Phillips curve using econometric methods that incorporate dynamic model averaging. These methods not only allow for coefficients to change over time, but also allow for the entire forecasting model to change over time. We find that dynamic model averaging leads to substantial forecasting improvements over simple benchmark regressions and more sophisticated approaches such as those using time varying coefficient models. We also provide evidence on which sets of predictors are relevant for forecasting in each period. 相似文献
48.
Dimitris Korobilis 《Oxford bulletin of economics and statistics》2013,75(2):157-179
This article extends the current literature which questions the stability of the monetary transmission mechanism, by proposing a factor‐augmented vector autoregressive (VAR) model with time‐varying coefficients and stochastic volatility. The VAR coefficients and error covariances may change gradually in every period or be subject to abrupt breaks. The model is applied to 143 post‐World War II quarterly variables fully describing the US economy. I show that both endogenous and exogenous shocks to the US economy resulted in the high inflation volatility during the 1970s and early 1980s. The time‐varying factor augmented VAR produces impulse responses of inflation which significantly reduce the price puzzle. Impulse responses of other indicators of the economy show that the most notable changes in the transmission of unanticipated monetary policy shocks occurred for gross domestic product, investment, exchange rates and money. 相似文献
49.
In this paper we present techniques for cointegration modeling of interrelated factor demands. These techniques respect the non-stationary character of the price and quantity data, and permit specification of general, dynamic factor demand models based on error correction forms derived from cointegration. Therefore, we do not have to assume ad hoc dynamic forms. Moreover, we ensure that estimated relations are structural, and not spurious. Cointegrating vectors are estimated subject to all standard economic theory restrictions by using a procedure, which we call dynamic SUR. We show how consistent error correction models can be specified and estimated. In addition, we test the neoclassical restrictions both in the short- and the long run. The new methods are used to shed light on the major problem of the European Union (unemployment) and its relationship with imports. The empirical analysis is conducted for five countries of the European Union with an emphasis to the south: The UK, France, Greece, Italy, and Spain. 相似文献
50.
Joachim Herbst Dimitris Karagiannis 《International Journal of Intelligent Systems in Accounting, Finance & Management》2000,9(2):67-92
Current workflow management systems (WFMS) offer little aid for the acquisition of workflow models and their adaptation to changing requirements. To support these activities we propose to apply techniques from machine learning, which enable an inductive approach to workflow acquisition and adaptation. We present a machine learning component that combines two different machine learning algorithms: the first induces the structure of sequential workflows and the second is responsible for the induction of transition conditions. The second task can be solved by applying standard decision rule induction algorithms. In this contribution we focus mainly on the algorithms for the first task. For this purpose we describe two algorithms based on the induction of hidden Markov models. The first algorithm is a bottom‐up, specific‐to‐general algorithm and the other applies a top‐down, general‐to‐specific strategy. Both algorithms have been implemented in a research prototype. In six scenarios we evaluate and compare the two algorithms experimentally. The induced workflow models can be imported by the business process management system ADONIS. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献