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Ali Sina Önder 《The German Economic Review》2017,18(4):516-522
I provide a brief discussion of the Handelsblatt ranking by focusing on its journal quality weights. I summarize the methodology underlying journals’ prestige measure, which is derived from their citation networks, and discuss its strengths and shortcomings. Although I agree that Handelsblatt ranking provides a great service to the profession, that same profession needs to be rather careful not to overemphasize the journal quality weights. 相似文献
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图像增强是数字图像处理的最基本的方法之一,本文总结了图像增强的基本理论,并对新的图像增强的方法作了简单介绍。 相似文献
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Sina Tutsch 《Quantitative Finance》2013,13(8):833-843
In the first part of the paper we investigate the properties that describe the intertemporal structure of dynamic convex risk measures. The usual backward approach to dynamic risk assessment leads to strong and weak versions of time consistency. As an alternative, we introduce a forward approach of consecutivity. In the second part we discuss the problem of how to update a convex risk measure when new information arrives. We analyse to what extent the above properties are appropriate update criteria. 相似文献
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Sina Badreddine Emilios C. Galariotis Phil Holmes 《Journal of International Financial Markets, Institutions & Money》2012,22(3):589-608
Considerable evidence from many countries suggests momentum strategies generate profits. These have been difficult to rationalise and evidence on the sources of such profitability is inconclusive. We utilise a sample of optioned stocks, characterised by high liquidity, high market capitalisation and fewer short sales constraints and compare results with control samples of non optioned stocks chosen on the basis of market value, turnover and bid–ask spread. The sample characteristics, and the fact that derivatives improve the impounding of information into prices, enable us to draw conclusions about the causes of momentum profits. While we find that short sales constraints are not the major driver of profitability and that most momentum profits disappear using two transactions costs measures of the bid–ask spread, one not previously used, the persistence of some momentum profits indicates that the market underreacts even to the most publicly available information. 相似文献
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Recent trends in the German food sector have shifted and segmented consumer consumption motives toward indulgence, quality, and sustainability. Simultaneously, in Western countries there has been a change in luxury consumption motives, shifting emphasis to hedonism, self-actualization, and quality instead of prestige. These parallel developments give rise to the question of how food is related to luxury. This study investigates the perceived dimensions of luxury food and outlines a number of segmented consumer groups based on these dimensions. By means of principal component and cluster analyes, seven dimensions were revealed, which generated four consumer segments. Six of the perceived dimensions of luxury food correspond to those that are found within general luxury goods and services. Sustainability and authenticity form a further dimension, mirroring new luxury values. In the cluster analysis, two segments can be identified as target groups for classic premium foods, whereby one group is predominated by new luxury values and the other is expected to buy lower-quality food. 相似文献
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Rewards are reinforcement mechanisms that organizations use to shape desirable employee behaviors. However, rewards may also have unintended consequences, such as building expectations for receiving extra benefits and weakening employee barriers to unethical acts. This article investigates the dark side of the reward–behavior association, and exploring what is referred to as the reward–theft parity effect (RTPE). The authors hypothesize that receiving rewards induces a corresponding type of theft. In Study 1, survey results (n = 634) show initial support for the RTPE between rewards and same-category theft, and that perceptions of procedural justice attenuate this association. Study 2 involved a 2 (reward) × 2 (theft opportunity) between-subjects experimental design (n = 300) and provides further support for the RTPE by revealing greater theft under a reward–theft parity condition than under a reward–theft disparity condition. Study 3 replicates these findings in a field experiment (n = 285) and finds that the RTPE is exacerbated when the reward–behavior task is perceived as unjust. Collectively, these findings provide new theoretical insights while also giving managers a more complete understanding of the dark side of behavioral reinforcement mechanisms. 相似文献
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Sina Wulfmeyer 《Journal of Behavioral Finance》2016,17(2):99-123
Documenting the disposition effect for a large sample of mutual fund managers in the United States, we find that stock-level characteristics explain the cross-sectional variation of the effect. The disposition effect, which is the tendency to sell winner stocks too early and hold on to loser stocks for too long, is more pronounced for fund managers who invest in stocks that are more difficult to value. Using different measures of stock and market uncertainty, we show that mutual fund managers display a stronger disposition-driven behavior when stocks are more difficult to value. We also find that the level of the disposition effect is monotonically increasing with the level of systematic risk (i.e., beta). In addition, we document that the trading behavior of mutual fund managers is partly driven by attention-grabbing stocks (dividend-paying stocks). Overall, our results suggest that stock-level uncertainty and trading of attention-grabbing stocks amplify the disposition effect and that differences in the effect can be explained by mutual fund managers' investment styles. Given that mutual funds hold a large fraction of the U.S. equity market, our findings add to the ongoing discussion whether professional investors can create stock mispricings and shed new light on market efficiency. 相似文献