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Pursey P. M. A. R. Heugens Stelios C. Zyglidopoulos 《Journal of Management and Governance》2008,12(4):325-341
Our current views of economic competition are still rooted in the imagery of the isolated firm that transacts with its buyers,
suppliers, and competitors via largely anonymous factor and product markets. Yet this view is fundamentally at odds with the
growing importance of business groups in the global economy. We thus need a reconceptualized version of our idea of economic
competition, which is capable of explaining competitive advantage at the group-versus-group rather than firm-versus-firm level
of analysis. In the present paper we build on insights derived from organizational sociology and organizational economics
to develop a business group-level theory of competition and competitive advantage based on embedded competencies.
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Stelios C. Zyglidopoulos (Corresponding author)Email: |
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Stelios Arvanitis 《统计学通讯:理论与方法》2018,47(1):28-41
We are occupied with an example concerning the limit theory of the ordinary least squares estimator (OLSE) when the innovation process of the regression has the form of a martingale transform the iid part of which lies in the domain of attraction of an α-stable distribution, the scaling sequence has a potentially diverging truncated α-moment, and the regressor process has a potentially divergent truncated second moment. We obtain matrix rates that reflect the stability parameter as well as the slow variations present in the aforementioned sequences, and stable limits. We also derive asymptotic exactness, consistency, and local asymptotic unbiasedness under appropriate local alternatives for a heteroskedasticity robust Wald test based on subsampling. The results could be useful for inference on the factor loadings in an instance of the APT model. 相似文献
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Stelios C. Zyglidopoulos 《英国管理杂志》2005,16(3):253-259
This study investigates the impact that downsizing has on corporate reputation. Drawing on the relevant literatures, two hypotheses are developed and tested. The findings of the study are as follows. First, downsizing has a negative impact on corporate reputation. Second downsizing is more damaging to corporate reputation than 'downscoping'–the sale of a division. 相似文献
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Petros Maravelakis John Panaretos Stelios Psarakis 《Journal of applied statistics》2004,31(4):445-455
Measurement error is a usually met distortion factor in real-world applications that influences the outcome of a process. In this paper, we examine the effect of measurement error on the ability of the EWMA control chart to detect out-of-control situations. The model used is the one involving linear covariates. We investigate the ability of the EWMA chart in the case of a shift in mean. The effect of taking multiple measurements on each sampled unit and the case of linearly increasing variance are also examined. We prove that, in the case of measurement error, the performance of the chart regarding the mean is significantly affected. 相似文献
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Screening is the first stage of many industrial experiments and is used to determine efficiently and effectively a small number of potential factors among a large number of factors which may affect a particular response. In a recent paper, Jones and Nachtsheim [A class of three-level designs for definitive screening in the presence of second-order effects. J. Qual. Technol. 2011;43:1–15] have given a class of three-level designs for screening in the presence of second-order effects using a variant of the coordinate exchange algorithm as it was given by Meyer and Nachtsheim [The coordinate-exchange algorithm for constructing exact optimal experimental designs. Technometrics 1995;37:60–69]. Xiao et al. [Constructing definitive screening designs using conference matrices. J. Qual. Technol. 2012;44:2–8] have used conference matrices to construct definitive screening designs with good properties. In this paper, we propose a method for the construction of efficient three-level screening designs based on weighing matrices and their complete foldover. This method can be considered as a generalization of the method proposed by Xiao et al. [Constructing definitive screening designs using conference matrices. J. Qual. Technol. 2012;44:2–8]. Many new orthogonal three-level screening designs are constructed and their properties are explored. These designs are highly D-efficient and provide uncorrelated estimates of main effects that are unbiased by any second-order effect. Our approach is relatively straightforward and no computer search is needed since our designs are constructed using known weighing matrices. 相似文献
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ABSTRACTThis study develops and implements methods for determining whether introducing new securities or relaxing investment constraints improves the investment opportunity set for all risk averse investors. We develop a test procedure for “stochastic spanning” for two nested portfolio sets based on subsampling and linear programming. The test is statistically consistent and asymptotically exact for a class of weakly dependent processes. A Monte Carlo simulation experiment shows good statistical size and power properties in finite samples of realistic dimensions. In an application to standard datasets of historical stock market returns, we accept market portfolio efficiency but reject two-fund separation, which suggests an important role for higher-order moment risk in portfolio theory and asset pricing. Supplementary materials for this article are available online. 相似文献