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61.
EVENT STUDY METHODS AND EVIDENCE ON THEIR PERFORMANCE 总被引:8,自引:0,他引:8
Seth Armitage 《Journal of economic surveys》1995,9(1):25-52
Abstract. The paper outlines widely used methods of estimating abnormal returns and testing their significance, highlights respects in which they differ conceptually, and reviews research comparing results they produce in various empirical contexts. Direct evidence on the performance of different methods is available from simulation experiments in which known levels of abnormal return are added. The market model is most commonly used to generate expected returns and no better alternative has yet been found despite the weak relationship between beta and actual returns. Choice of procedure for significance testing depends on the characteristics of the data. The evidence indicates that in many cases the best procedure is to standardise market model abnormal returns by their time series standard errors of regression and use the t -test. Alternatively a rank test appears to be at least as powerful. If errors are cross-correlated or increase in variance during the test period, other methods discussed should be used. 相似文献
62.
Corporate disclosure, cost of capital and reputation: Evidence from finance directors 总被引:1,自引:1,他引:0
The majority view of the executives interviewed is that disclosure reduces the cost of equity up to the point at which a good-practice level of communication has been reached, after which there is little further effect. Greater disclosure to rating agencies and lenders reduces the cost of debt. Attitudes towards more mandatory disclosure are mostly negative. The main perceived cost of disclosure is creating the information. The main benefits are promotion of a reputation for openness and of shareholder confidence, not a lower cost of capital. We suggest that a reputation for openness is valued because it enhances the company's overall reputation, which brings commercial benefits. 相似文献
63.
The Cost of Diversity: Endogenous Property Rights and Growth 总被引:2,自引:0,他引:2
Seth W. Norton 《Constitutional Political Economy》2000,11(4):319-337
Well-specified property rightsenhance economic performance but vary considerably across countries.The failure of numerous nation-states to adopt growth-enhancinginstitutions is paradoxical. This paper examines the role ofethnic and linguistic diversity in retarding the developmentof growth-enhancing property rights and in-turn economic growth.The data show that property rights are attenuated in more diversepolities and economic growth is correspondingly lower. 相似文献
64.
Jayanta Bhattacharya Frank Neuhauser† Robert T. Reville‡ Seth A. Seabury§ 《The Journal of risk and insurance》2010,77(1):231-260
Workers' compensation systems are typically designed to assign higher permanent disability benefits to workers with more severe disabilities. However, little or no scientific work exists to guide the design of ratings systems to properly account for the amount of earnings power lost due to disability. In this article, we examine the effectiveness of disability ratings using matched administrative data on ratings and earnings for a large, representative sample of permanent disability claimants in California. We find that while workers with higher ratings do experience larger earnings losses on average, there are large and persistent differences in average earnings losses for similarly rated impairments in different parts of the body. We then explore how adjusting permanent disability ratings to reflect cross-impairment differences in earnings losses can affect the equity of permanent disability benefits. Adjusting disability ratings to account for typical earnings losses reduces cross-impairment differences substantially. The adjusted ratings result in a more equitable distribution of disability benefits across workers with different impairments. 相似文献
65.
Even the highest‐rated life‐annuity providers have a nonzero probability of becoming insolvent during an annuitant's retirement, and many potential annuitants are unaware of the state guaranty associations (SGAs) which provide insurance against the associated financial consequences. We study the theoretical implications of insolvency risk—real and perceived—for annuitization. Then, using a disciplined calibration of annuitant misperceptions in a standard life cycle model, we show that even the modest perceived risk of default associated with highly‐rated providers can—absent awareness of the SGAs—reduce annuitization and significantly reduce welfare. We further consider the implications of information frictions which prevent retirees from discerning true insolvency risk and we find that these frictions have plausibly large additional quantitative implications for annuitization and welfare. Simulations of our model further suggest that the general lack of awareness of the SGA backstop by potential annuitants can erode a sizable fraction of the potential welfare benefits thereof. 相似文献
66.
We study payout by UK listed companies during 1993–2018. Regular dividends remain the dominant channel, but flexible payouts (special dividends and repurchases) have grown, and they make total payout more responsive to earnings. Flexible payouts are used to augment regular dividends: few companies pay out by flexible means only, and tests indicate that they augment rather than replace regular dividends. Comparison with US evidence shows that UK companies make greater use of dividends (including specials) in relation to repurchases, and have a greater willingness to change regular dividend per share. 相似文献
67.
Seth Ketron 《Journal of Retailing》2018,94(2):154-166
Although prior scholarship has demonstrated important effects of visual complexity on product perceptions, the relationship between the visual complexity of a product’s environment and that product’s perceived size remains unexplored. Because size is such an important product characteristic in many consumer contexts, the lack of exploration of this relationship leaves a significant gap in the literature on size perceptions, especially in relation to the retailing domain. The present investigation seeks to document the relationship between environmental visual complexity and the perceived size of a product. Namely, five studies show that high visual complexity decreases consumer size perceptions of a focal product through a serial mediation process in which high complexity pulls consumer attention away from the focal product. This shifted attention decreases processing fluency and leads consumers to perceptually minimize size to avoid information overload in the processing of a display. Even after ruling out potential influences of referent information (study 5) and alternative explanations of affective processing and perceived depth (study 4), these effects hold. The findings have implications for both theory and practice, shedding light on the relationship between size perceptions of a focal object and its environment. 相似文献
68.
Seth Schindler 《International journal of urban and regional research》2014,38(3):791-804
Ananya Roy introduces the concept ‘subaltern urbanism’ in her 2011 article ‘Slumdog Cities: Rethinking Subaltern Urbanism’. She challenges researchers to move beyond existing epistemological and methodological limits, and offers four concepts which, taken together, serve as a useful starting point for understanding and representing subaltern urban space. In this article I argue that instead of a deductive approach that begins with an a priori identification of slums as subaltern urban space, an inductive approach of identifying subaltern urban space would expand the concept and show that subaltern urbanism exists in the global North. I present original research to show that Flint, Michigan, can be considered subaltern urban space. In the final section of the article I argue that this inductive approach to subaltern urbanism can foster comparative research across the North‐South divide, and generate the transfer of knowledge from South to North. 相似文献
69.
Seth D. BaumAuthor Vitae Ben GoertzelAuthor VitaeTed G. GoertzelAuthor Vitae 《Technological Forecasting and Social Change》2011,78(1):185-195
The development of human-level AI has been a core goal of the AI field since its inception, though at present it occupies only a fraction of the field's efforts. To help understand the viability of this goal, this article presents an assessment of expert opinions regarding human-level AI research conducted at AGI-09, a conference for this AI specialty. We found that various experts strongly disagree with each other on certain matters, such as timing and ordering of key milestones. However, we did find that most experts expect human-level AI to be reached within upcoming decades, and all experts give at least some chance that some milestones will be reached within this time. Furthermore, a majority of experts surveyed favor an integrative approach to human-level AI rather than an approach centered on a particular technique. Finally, experts are skeptical about the impact of massive research funding, especially if it is concentrated in relatively few approaches. These results suggest that the possibility of achieving human-level AI in the near term should be given serious consideration. 相似文献
70.
Seth C. Anderson B. Jay Coleman Cheryl J. Frohlich Jeffrey W. Steagall 《The Journal of Financial Research》2001,24(3):331-346
Previous closed‐end country fund research concludes that returns behave more like the U.S. market than like their target markets. We argue this finding may be biased by model misspecification and inappropriate estimation techniques. We propose a single‐equation model containing five hypothesized factors of fund returns. We estimate this model for nineteen pooled seasoned funds using a time‐series cross‐section regression that corrects for two types of autocorrelation. We show that returns are strongly related to target markets. Returns are also related to changes in discounts, exchange rates, and other countries' markets, but are only weakly related to the U.S. market. JEL classification: G10, G12 相似文献