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1.
Monica C. Jackson Adria Trotman Melissa Stephens Kimberly F. Sellers 《Quality and Quantity》2013,47(1):15-26
In numerous psychology studies, subjects are asked to perform some task a number of times, T. The effect of the choice of T on the associated inference, however, is usually not assessed. We investigate the appropriate choice of T empirically by using data collected in a study on the relationship between psychopathy and risk-taking in 90 inner city drug users enrolled in a residential treatment program. We show that, when studying this relationship, the latency variable usually discarded from the analysis behaves exponentially allowing a natural division of the study period 1, . . . , T into two distinct subperiods. These subperiods yield significantly different results—in the early period only (which we call “reactive”), subjects with high psychopathy scores exhibit lower sensitivity to reward and punishment in our risk taking experiment. The later period (which we call “stable”) shows no relationship between sensitivity to reward and punishment and psychopathic tendencies. 相似文献
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We use a simple theoretical model of seasonal market participation in the presence of liquidity constraints and transaction costs to explain the ‘sell low, buy high’ puzzle in which some households do not take advantage of inter‐temporal price arbitrage through storage and sell output postharvest at prices lower than observed prices for purchases in the subsequent lean season. We test our model with data from western Kenya using maximum likelihood estimation of a multivariate sample selection model of market participation. Access to off‐farm income and credit indeed seem to influence crop sales and purchase behaviours in a manner consistent with the hypothesised patterns. 相似文献
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This paper presents hedging strategies for European and exotic options in a Lévy market. By applying Taylor’s theorem, dynamic hedging portfolios are constructed under different market assumptions, such as the existence of power jump assets or moment swaps. In the case of European options or baskets of European options, static hedging is implemented. It is shown that perfect hedging can be achieved. Delta and gamma hedging strategies are extended to higher moment hedging by investing in other traded derivatives depending on the same underlying asset. This development is of practical importance as such other derivatives might be readily available. Moment swaps or power jump assets are not typically liquidly traded. It is shown how minimal variance portfolios can be used to hedge the higher order terms in a Taylor expansion of the pricing function, investing only in a risk‐free bank account, the underlying asset, and potentially variance swaps. The numerical algorithms and performance of the hedging strategies are presented, showing the practical utility of the derived results. 相似文献
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Does technologically-supported work connectivity help young managers and professionals under the age of 45 deal with the pressing demands of their work, or does the presence of work-connecting technologies exacerbate the tendencies of this talent force to engage in more work and longer working hours? Utilizing both surveys and follow-up focus group interactions, this study found that while work-connecting technologies permitted a greater range of options regarding when and where work was done, this same connectivity provided constant availability to work and often drove expectations that more must be done, thereby increasing the likelihood of longer work hours and—surprisingly—leading to a diminished sense of flexibility. Study participants offer insights regarding the thought processes behind these outcomes. Perspectives on how emerging leaders and their organizations can effectively manage and achieve the potential of enhanced connectivity are provided. A four-phased approach is recommended. First, we discuss key cultural dynamics. Second, the role of organizational expectations and practices is emphasized. Third, we consider a set of responsibilities for organizational leaders, whose actions and cues provide the most vivid clarity for young managers attempting to decide where to draw the work/life balance line. Finally, the challenge and responsibility of personal accountability is presented. Consideration of a work paradigm that reorients our thinking about traditional “face time,” and strives to bridge the gap between the potential and pervasive impact of work-connecting technologies, is also included. 相似文献
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The tenth session of the World Food Council in Addis Ababa, Ethiopia, held on 11–15 June 1984, undertook an assessment of international activities in the decade since 1974 for meeting the World Food Conference objectives of improving the global food system and overcoming the blight of world hunger. One document prepared for the session looks specifically at the activities of the multilateral institutions since the 1974 conference, in terms of both resource and programme commitments. This article provides a summary of that WFC document. 相似文献
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Winnay SS 《Employee benefits journal》2004,29(2):37-40
Self-managed, "tailored" behavioral change programs cross both wellness and disease management issues and can impact the bottom line on health care costs of both employer and employee. For example, a back pain program can help change employee behavior to prevent the incidence and upflow of a condition to more severe and debilitating situations. 相似文献
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Actual Share Reacquisitions in Open-Market Repurchase Programs 总被引:7,自引:0,他引:7
Unlike Dutch auction repurchases and tender offers, open-market repurchase programs do not precommit firms to acquire a specified number of shares. In a sample of 450 programs from 1981 to 1990, firms on average acquire 74 to 82 percent of the shares announced as repurchase targets within three years of the repurchase announcement. We find that share repurchases are negatively related to prior stock price performance, suggesting that firms increase their purchasing depending on its degree of perceived undervaluation. In addition, repurchases are positively related to levels of cash flow, which is consistent with liquidity arguments. 相似文献