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51.
The purpose of this paper is to present a closed formula to compute the moments of a general function from the knowledge of
its bivariate survival function. The result is derived by utilizing an integration by parts formula for two variables, which
is not readily available in the literature. Many of the existing results are obtained as special cases. Finally, two examples
are presented to illustrate the results. In both the examples, mixed moments as well as moments for the series system and
parallel system are obtained. The integration by parts formula in two variables, derived here, is of interest in its own right
and we hope that it will be useful in other investigations. The integration by parts formula in two variables is derived as
a special case of a general formula in n variables. 相似文献
52.
We study the intertemporal risk‐return tradeoff relations based on returns from 18 international markets. We find striking new empirical evidence that the inclusion of U.S. market returns significantly changes the estimated risk‐return tradeoff relations in international markets from mostly negative to predominantly positive. Our results are consistent with the lead‐lag effect between U.S. and international markets in the sense of Rapach, Strauss and Zhou. 相似文献
53.
Mohammad Bitar M. Kabir Hassan Kuntara Pukthuanthong Thomas Walker 《Open Economies Review》2018,29(5):1003-1038
This paper examines the effect of various types of bank capital on the profitability and efficiency of conventional and Islamic banks. Our results show that higher quality forms of capital improve the profitability and efficiency for both systems although the results are stronger for conventional banks. The capital effect is more pronounced for large, too-big-to-fail, and highly capitalized banks. The results are robust across various subsamples, alternative profitability and efficiency measures, and different estimation techniques. 相似文献
54.
Financial services institutions often provide special introductory prices to new customers who sign up for their services such as credit cards, credit monitoring services and online stock trading. Despite their prevalence, the decision to provide introductory prices to new customers entails challenges for decision makers. Providing small incentives may not perceptibly affect the adoption of the service while providing a large incentive leads to the loss of revenue and profits. As a result, the effectiveness of such activities on firm profitability remains largely unexplored. This study seeks to address this gap in the literature by exploring optimal introductory pricing of a financial service. Employing agent-based simulation experiments, we find that offering introductory discounts significantly increases a firm’s net present value (NPV) of profits. Moreover, the findings suggest the amount of discount and the duration of time that a new customer receives the discount are critical factors in determining the NPV of profits. The research and managerial implications are discussed. 相似文献
55.
Mohammad Jaforullah & John Whiteman 《The Australian journal of agricultural and resource economics》1999,43(4):523-541
The aim in this article is to measure the scale efficiency of the New Zealand dairy industry and to examine the relationship between farm size and technical efficiency. Data envelopment analysis (DEA) is applied to a sample of 264 dairy farms. The results suggest that 19 per cent of these farms are operating at optimal scale, 28 per cent at above optimal scale, and 53 per cent at below optimal scale. On average, the optimal size for New Zealand dairy farms is estimated at 83 hectares with a herd of 260 animals. Average technical efficiency is estimated at 89 per cent. 相似文献
56.
Recent attention to accountants’ ethics in the news, in professional practice, and by academia leads to questions about the ethical and cognitive characterization of students selecting accounting careers. We employ the Myers/Briggs Type Indicator (MBTI) for assessing cognitive styles, and the Defining Issues Test (DIT) for assessing ethical reasoning to study differences between two groups of accounting graduates and new hires entering the accounting profession across a period of 15 years. We show that the dominant cognitive make-up of accountants has not changed significantly over the study period, which is consistent with prior research. Also, we hypothesize and provide evidence that this dominant style is associated with lower levels of ethical reasoning (as measured by the DIT) than other cognitive styles. The ethical reasoning scores are lower for the 2005 sample than for the 1990 sample. This result may be attributable to age, gender, grade point average, or political orientation; however, incomplete data in our sample does not allow us to make definitive conclusions regarding these control variables. We discuss the implications of these findings for curriculum development and professional practice. 相似文献
57.
Parham Fami Tafreshi Mohammad Hasan Aghdaie Majid Behzadian Mahdieh Ghani Abadi 《Group Decision and Negotiation》2016,25(5):1021-1048
The importance of advertising media evaluation as a multifaceted problem is well known by both academics and practitioners. Although previous studies tried to optimize media evaluation, there still are some gaps and problems to address, particularly in areas of flexibility of models/frameworks, decision making quality, tension management, and agility of the evaluation process. Most of previous studies are based on inflexible models/frameworks that have limitations on number of criteria/alternatives they can consider and type of data they can process. A great volume of the work used arbitrary decision making; arbitrary decision making regarding criteria and media importance may reduce effectiveness of advertising campaigns. Furthermore, the academic literature offers little guidance on group decision aggregation, and tension management during decision making is neglected. Media evaluation is a time taking process and any acceleration will reduce pre-campaign costs. The main aim of this paper is to illustrate how a group decision support system (GDSS) can assist media planners to overcome mentioned problems more systematically. For this purpose, we developed a GDSS that is an integration of three well-known multi-criteria decision making techniques. With a real world case study, we illustrate the performance of the proposed GDSS. Results of our quantitative assessments indicate that the GDSS is flexible, allows decision makers to express their opinions, reduces tension among decision makers, and saves time. 相似文献
58.
Ali Mohammad Mir 《Journal of Leadership Studies》2010,4(3):69-72
Leadership is about knowledge, skills, and abilities for transformation. It is also increasingly about worldviews or visions of life—beliefs, values, and principles. But worldviews are also ways of life, for beliefs direct us, values guide us, and principles motivate us to certain kinds of action and behavior. How, then, do worldviews have an impact on leadership for transformation? If worldviews are glasses or filters by which we view the world, mental models of the bigger picture, frameworks by which we make sense of the world, and narratives by which we orient our lives, then how do they influence human thoughts, ideas, and behaviors when it comes to transformative leadership? This was the subject matter of an International Leadership Association Conference panel discussion held in November 2009 in Prague, entitled Leadership for Transformation: The Impact of Worldviews. It is also the subject matter of this issue's symposium, in which we bring you the four papers and the response presented at the conference. Members of the panel were characterized by gender, disciplinary, religious, and global diversity. Nathan Harter, organizational leadership professor at Purdue University in the United States, begins the discussion with some preliminary remarks about worldviews. Ali Mohammed Mir, medical doctor and director of programs of Population Council, Pakistan, speaks of leadership from an Islamic perspective. Michael Jones, accomplished composer, pianist, and leadership educator, writer, and speaker from Orillia, Canada, reflects on how a “marriage of mythos and logos” can transform leadership today. Lisa Ncube, originally from Zimbabwe and currently assistant professor of organizational leadership at Purdue University, speaks about Ubuntu as an alternative leadership philosophy emerging from Africa. John Valk, associate professor of worldview studies at Renaissance College, University of New Brunswick, Canada, speaks of leadership for transformation from a Christian worldview perspective. Jonathan Reams, associate professor in the Department of Education at the Norwegian University of Science and Technology in Trondheim, responds to all of the papers and opens a venue for further discussion. We hope that you will find this symposium engaging. We hope it will give food for thought and that it might stimulate further thinking regarding the role worldviews play in leadership for transformation. 相似文献
59.
In the study of reliability of the technical systems, records model plays an important role. Suppose that a technical system
is subject to shocks, e.g. peaks of voltages or stresses. The successive large shocks may be viewed as realizations of records
from a sequence of identically independent voltages. Assume that the lower limit value of the mth record voltage (stress) is v > 0. Under these conditions, we propose a mean residual of records (MRR’s) for the future records. We study several properties
of MRR. We show that the proposed MRR uniquely characterizes the distribution function that generated the sequence of records.
It is proved that when the model under study has an increasing hazard rate the corresponding MRR is decreasing. We also compare
between two record systems based on their MRR’s when these systems are ordered in terms of their hazard rates. 相似文献
60.
Mohammad Asghari Jafarabadi Iman Dianat 《International journal of injury control and safety promotion》2018,25(2):222-228
To evaluate the quality of reporting in published randomized controlled trials (RTCs) in the field of fall injuries. The 188 RTCs published between 2001 and 2011, indexed in EMBASE and Medline databases were extracted through searching by appropriate keywords and EMTree classification terms. The evaluation trustworthiness was assured through parallel evaluations of two experts in epidemiology and biostatistics. About 40%–75% of papers had problems in reporting random allocation method, allocation concealment, random allocation implementation, blinding and similarity among groups, intention to treat and balancing benefits and harms. Moreover, at least 10% of papers inappropriately/not reported the design, protocol violations, sample size justification, subgroup/adjusted analyses, presenting flow diagram, drop outs, recruitment time, baseline data, suitable effect size on outcome, ancillary analyses, limitations and generalizability. Considering the shortcomings found and due to the importance of the RCTs for fall injury prevention programmes, their reporting quality should be improved. 相似文献