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The Balanced Votes Method: A new perspective on symmetry in creating fair redistricting plans and measuring gerrymandering 平衡投票法:在制定公平的重新划分计划和衡量不公正的选区划分中,对称的新视角
Pub Date : 2021-08-08 DOI: 10.2139/ssrn.3813521
R. Wallin
Last decade’s unprecedented whirlwind of redistricting lawsuits and reforms have fallen behind us as redistricters shift their focus to tomorrow’s elections. This decade’s redistricting plans will be scrutinized more than ever, and the public’s perception of these new plans is vital to their acceptance. This article presents the Balanced Votes (BV) method and the Weighted Districts Method (WDM). The BV method measures the partisan fairness of a redistricting plan and creates ‘dot plots’ which show each district’s benefit/harm in relation to the overall plan. BV dot plots provide comparisons of plans (1) within a state, (2) between states, and (3) between different election cycles. The BV method mathematically derives the cutoff points for packed districts, the value of packed districts, and the value of safe seats. The BV also derives a measure of competitive districts. The BV method accomplishes this by evaluating a redistricting plan from its two independent symmetry points: the statewide vote share, and the fifty-percent winner’s threshold. To aid the general public, this article derives a user-friendly approximation to the BV method, the Weighted Districts Method (WDM). Since WDM dot plots are easy to interpret, they provide a conduit for conversation between redistricters and constituents, or justices as the case may be. The WDM dot plots can be created and evaluated by any citizen using only a pen and a blank WDM weighting function (supplied in the appendix). Most importantly, the BV and WDM methods measure districts, not seats.  
过去十年前所未有的重新划分诉讼和改革旋风已经落在我们后面,因为重新划分选区的人将注意力转移到明天的选举上。这十年的重新划分计划将比以往任何时候都受到更严格的审查,公众对这些新计划的看法对它们的接受程度至关重要。本文介绍了平衡投票法(BV)和加权选区法(WDM)。BV方法衡量重新划分选区计划的党派公平性,并创建“点图”,显示每个地区与整体计划相关的利益/损害。BV点图提供了(1)在一个州内、(2)在两个州之间以及(3)不同选举周期之间的计划比较。BV方法从数学上推导出拥挤地区的分界点、拥挤地区的值和安全席位的值。BV还派生出竞争地区的衡量标准。BV方法通过从两个独立的对称点评估重新划分计划来实现这一点:全州选票份额和50%的获胜者门槛。为了帮助公众,本文导出了一种用户友好的近似BV方法,加权区域法(WDM)。由于WDM点图很容易解释,它们为选区重划者和选民或法官之间的对话提供了一个渠道。任何公民都可以使用钢笔和空白的WDM加权函数(在附录中提供)来创建和评估WDM点图。最重要的是,BV和WDM方法衡量的是地区,而不是席位。
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引用次数: 0
An in Vitro Study to Evaluate and Compare the Remineralizing Potential among Casein Phosphopeptide-Amorphous Calcium Phosphate (CPP-ACP) with Fluoride and Surface Pre-Reacted Glass (S-PRG) Fillers Using Quantitative Analysis. 酪蛋白磷酸肽-无定形磷酸钙(CPP-ACP)与氟化物和表面预反应玻璃(S-PRG)填料再矿化电位的体外定量比较研究
Pub Date : 2021-08-01 DOI: 10.37983/ijdm.2021.3301
Shabista Jabi, Swati Dwivedi, V. Upadhyay, A. Abdullah, Mohammad Sarfaraj, Ankur Mishra
Background- Early treatment of white spot lesions is essential to prevent the progression of the lesion. Aim - To evaluate and compare the remineralizing potential of CPP-ACP with fluoride (Casein Phospho Peptide-Amorphous Calcium Phosphate) and S-PRG fillers (Surface Pre reacted glass fillers) using atomic absorption spectroscopy and colorimetric method. Materials and methods- Forty sound human premolars were used in this study. They were divided into two groups (A & B), consisting of 20 samples in each. White spot lesions (WSLs) were established on the window (4x4 mm2) created on the buccal surfaces of the samples. Samples in group A were treated with casein phosphopeptide amorphous calcium phosphate (CPP-ACP) with fluoride, those of group B were treated with S-PRG Fillers. The sample teeth were immersed in a demineralizing solution for 4 days. All the samples were subjected to loss of mineral content (wt %), i.e., calcium, using atomic absorption spectroscopy and phosphorus using the colorimetric method. Results- Statistical analysis was performed using one?way analysis of variance, Tukey’s and paired t-tests. Group A exhibited the highest remineralizing potential, followed by Group B. Statistically, a significant difference (p=0.001) was observed between the two groups. Conclusion- There was a significant difference in remineralizing potential of CPP-ACP with fluoride and S-PRG Fillers. CPP-ACP with fluoride appears to be an effective technique in the remineralization of white spot lesions.
背景-早期治疗白斑病变是必不可少的,以防止病变的进展。目的:利用原子吸收光谱法和比色法评价和比较氟化物(酪蛋白磷酸肽-无定形磷酸钙)和S-PRG填料(表面预反应玻璃填料)对CPP-ACP再矿化的影响。材料和方法:本研究使用了40颗健全的人类前磨牙。他们被分为两组(A和B),每组20个样本。在样品颊面创建的窗口(4x4 mm2)上建立白斑病变(WSLs)。A组采用酪蛋白磷酸肽无定形磷酸钙(CPP-ACP)加氟处理,B组采用S-PRG填料处理。将牙齿样品浸泡在脱矿液中4天。所有样品的矿物含量损失(wt %),即钙,使用原子吸收光谱和磷使用比色法。结果-统计分析使用一个?方差分析,Tukey 's和配对t检验。A组再矿化电位最高,b组次之,两组间差异有统计学意义(p=0.001)。结论-氟化物和S-PRG填料对CPP-ACP再矿化电位有显著差异。CPP-ACP加氟化物似乎是白斑病变再矿化的有效技术。
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引用次数: 0
Sport Sponsorship Announcement and Stock Returns: A Meta-Analytic Review 体育赞助公告与股票回报:一项元分析回顾
Pub Date : 2020-12-17 DOI: 10.2139/ssrn.3751134
Youngbum Kwon, T. Bettina Cornwell
PurposeGiven the public availability of secondary data on investments in events such as the Olympics, FIFA World Cup and professional sports, event studies that measure stock market response to these investments have grown. Previous findings are mixed, however, with some studies suggesting that the announcement of sponsorship contracts is a positive event and others finding detrimental effects of the announcement on shareholder value. This study aims to analyze the mixed findings from event studies in sport sponsorship to determine if sponsorship announcements influence stock market response.Design/methodology/approachThe meta-analysis examines more than 20 years of research on event studies in sponsorship (34 studies).FindingsThe overall results show a positive, but non-significant effect of partnership deal announcements on shareholder wealth. Further analysis considers the effects of sponsorship announcements by each type of event window to see the impact of the announcement relative to time (pre-announcement, announcement day, post-announcement and pre- to post-announcement). This closer examination of the event window shows that stock prices of sponsoring organizations increased in the pre-announcement window.Originality/valueQuantitative meta-analytic findings indicate that information about sponsorship deals appears to leak to share markets and positively influence share price. This finding suggests that sponsoring the sports and events found in these event studies is seen as value enhancing for sponsoring firms.
鉴于奥运会、国际足联世界杯和职业体育等赛事投资的二手数据公开,衡量股市对这些投资反应的赛事研究有所增加。然而,之前的研究结果好坏参半,一些研究表明,宣布赞助合同是一件积极的事情,而另一些研究则发现,宣布赞助合同对股东价值有不利影响。本研究旨在分析体育赞助事件研究的混合结果,以确定赞助公告是否影响股市反应。设计/方法/方法荟萃分析检查了20多年来关于赞助事件研究的研究(34项研究)。总体结果显示,合伙交易公告对股东财富有积极但不显著的影响。进一步分析通过每种类型的活动窗口考虑赞助公告的影响,以查看公告相对于时间(公告前、公告日、公告后和公告前后)的影响。对活动窗口的仔细检查显示,赞助组织的股票价格在公告前窗口上涨。独创性/价值量化元分析结果表明,有关赞助协议的信息似乎会泄漏到股票市场,并对股价产生积极影响。这一发现表明,赞助这些事件研究中发现的体育和事件被视为赞助公司的价值提升。
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引用次数: 7
How Shifting from In-Person to Virtual-Only Shareholder Meetings Affects Shareholders’ Voice 从面对面的股东大会到虚拟的股东大会如何影响股东的声音
Pub Date : 2020-08-16 DOI: 10.2139/ssrn.3674998
Miriam Schwartz-Ziv
Shareholder meetings are one of the only opportunities for most investors to interact directly with management. Due to COVID-19, however, shareholder meetings have moved to a virtual format. Analysis of transcripts and recordings of in-person and virtual shareholder meetings in 2019–2020 shows that, relative to in-person meetings, the overall time of virtual meetings is 18% shorter, and 29% less time is spent by firms on answering each question. These findings indicate that communication between companies and shareholders is more limited at virtual meetings. To examine if shareholders face challenges in their attempts to increase such communication in virtual meetings, I construct a dataset on shareholders’ attempts to submit questions to virtual shareholder meetings and document several tactics firms use to avoid addressing them. For example, firms explicitly state that no (additional) questions were submitted, whereas I document that multiple questions were submitted by shareholders, but were ignored. Finally, a mechanism that imposes severe restrictions on shareholders’ ability to submit questions at virtual shareholder meetings is uncovered: the use of a non-Broadridge platform to broadcast the meeting. Overall, the paper documents that with regard to 55% of the firms to which shareholders attempted to submit questions, shareholders faced obstacles. The paper concludes with policy recommendations on how virtual shareholder meetings can be designed in ways that foster communication between management and companies. Presentation of paper is available at this link: https://www.youtube.com/watch?v=vjp6VcISqDE&feature=youtu.be
股东大会是大多数投资者与管理层直接互动的唯一机会之一。但是,由于新冠肺炎疫情,股东大会转向了虚拟形式。对2019-2020年面对面和虚拟股东大会的记录和记录的分析表明,与面对面会议相比,虚拟会议的总时间缩短了18%,公司回答每个问题的时间减少了29%。这些发现表明,公司与股东之间的沟通在虚拟会议中更为有限。为了检验股东在虚拟会议中增加这种沟通是否面临挑战,我构建了一个关于股东试图向虚拟股东大会提交问题的数据集,并记录了公司用来避免解决这些问题的几种策略。例如,公司明确声明没有提交(额外)问题,而我记录了股东提交的多个问题,但被忽略了。最后,还发现了一种对股东在虚拟股东大会上提交问题的能力施加严格限制的机制:使用非broadridge平台直播会议。总体而言,该论文表明,在股东试图向其提出问题的公司中,有55%面临障碍。论文最后就如何设计虚拟股东会议以促进管理层和公司之间的沟通提出了政策建议。论文的介绍可在此链接:https://www.youtube.com/watch?v=vjp6VcISqDE&feature=youtu.be
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引用次数: 8
Did Everything Change After 911? Not Everything! 911事件后一切都变了吗?不是一切!
Pub Date : 2019-08-17 DOI: 10.2139/ssrn.3438836
Markham Ball
Everything changed after September 11, 2001. At least that is what everyone is saying. Political pundits, reporters, and even our closest relatives will have us believe the post 9-11 America is unlike the one that we lived in prior to the tragedy. But is it?
2001年9月11日之后,一切都变了。至少每个人都这么说。政治专家、记者,甚至我们最亲近的亲戚都会让我们相信,911后的美国与悲剧发生前的美国不同。但这是真的吗?
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引用次数: 0
Online Smart Ration Card System with Multifactor Authentication 具有多因素认证的在线智能配给卡系统
Pub Date : 2019-05-17 DOI: 10.2139/ssrn.3418501
Bharati Kamble, N. Dambe, S. Kulkarni, Gauri R Virkar
In this paper, the online smart ration card system with multifactor authentication techniques has been proposed to prevent from ration forgery. Multiple factors like biometric (fingerprint technique), Radio Frequency Identification (RFID), color code sequences and SMS entry way are used to keep the ration fraud. In this framework, a RFID tag is utilized that conveys relative points of interest and the client needs to show this tag at the ration shop or at his/her place before getting the ration. The user will need to give thumb impression on the biometric machine to verify if user is authentic or not. Additionally, before placing an order the user has to provide preferences of color code sequences as provided by the user during registration. Thus, the user ‘s authenticity is verified using multiple factors thereby increasing the security of the overall system. Apart from traditional approach of visiting and then collecting the ration, a novel approach has been introduced here where the authenticated user can demand the ration online and receive it at their specified location(Eg: Home address). In this paper, we present a brief introduction to Ration Distribution system using Smart card with increased usability and security of the overall system.
为了防止口粮伪造,提出了一种采用多因素认证技术的在线智能口粮卡系统。利用生物识别(指纹技术)、射频识别(RFID)、彩色码序列和短信输入方式等多种因素来防止定量欺诈。在这个框架中,使用了一个RFID标签来传达相关的兴趣点,客户需要在配给店或他/她所在的地方显示这个标签,然后才能获得配给。用户需要在生物识别机器上留下拇指印,以验证用户是否真实。此外,在下订单之前,用户必须提供用户在注册时提供的颜色代码序列的首选项。通过多种因素验证用户的真实性,从而提高了整个系统的安全性。除了传统的上门领取口粮的方法外,本文还引入了一种新的方法,即通过身份验证的用户可以在线索取口粮,并在指定的地点(例如:家庭住址)领取口粮。本文简要介绍了智能卡配给系统,提高了整个系统的可用性和安全性。
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引用次数: 0
Social Trading at a Glance - A Performance Analysis of Signal Providers 社会交易的一瞥-表现分析的信号提供者
Pub Date : 2019-05-01 DOI: 10.2139/ssrn.3410534
Alexander Deneke
This study provides an overview of the characteristics of signal providers on social trading platforms, which are increasing in relevance supported by the fact that retail investors do not like to make investment decisions by themselves. Signal providers and receivers exist on the platform. We use a proprietary data set of one of the largest German social trading platforms. Signal providers are grouped to certain career levels, which represent a track record calculated with the help of certain performance and risk variables. Career level five represents the highest possible ranking. We show that signal providers in general neither outperform mutual funds nor the market. However, the motivation for signal receivers to go on social trading platforms should be the high transparency and simplicity to invest amongst others. Furthermore, the study's robustness check indicates that signal providers' investment strategies are not likely to be effected in times of high market volatility due to not investing in assets that are highly prone to market movements. This behaviour is shown by a factor analysis.
本研究概述了社交交易平台上信号提供者的特征,这些特征与散户投资者不喜欢自己做出投资决策这一事实的相关性越来越强。平台上存在信号提供者和接收器。我们使用德国最大的社交交易平台之一的专有数据集。信号提供商被划分为特定的职业级别,这代表了在某些绩效和风险变量的帮助下计算的跟踪记录。职业级别5代表最高可能的排名。我们的研究表明,信号提供商总体上既不优于共同基金,也不优于市场。然而,信号接收者进入社交交易平台的动机应该是高透明度和简单的投资。此外,研究的稳健性检验表明,信号提供商的投资策略不太可能在高市场波动时期受到影响,因为他们不投资于高度容易受到市场波动影响的资产。因子分析显示了这种行为。
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引用次数: 1
Imitation in the Imitation Game 模仿游戏中的模仿
Pub Date : 2017-10-10 DOI: 10.2139/ssrn.3049897
R. Kashyap
We discuss the objectives of automation equipped with non-trivial decision making, or creating artificial intelligence, in the financial markets and provide a possible alternative. Intelligence might be an unintended consequence of curiosity left to roam free, best exemplified by a frolicking infant. For this unintentional yet welcome aftereffect to set in a foundational list of guiding principles needs to be present. A consideration of these requirements allows us to propose a test of intelligence for trading programs, on the lines of the Turing Test, long the benchmark for intelligent machines. We discuss the application of this methodology to the dilemma in finance, which is whether, when and how much to Buy, Sell or Hold.
我们讨论了在金融市场中配备非琐碎决策或创造人工智能的自动化目标,并提供了一种可能的替代方案。智力可能是好奇心自由漫游的意外结果,最好的例子就是一个嬉闹的婴儿。要想让这种无意但受欢迎的后果形成一份基本的指导原则清单,就必须呈现出来。考虑到这些要求,我们可以为交易程序提出一种智能测试,类似于长期以来智能机器的基准图灵测试(Turing test)。我们将讨论这种方法在金融困境中的应用,即是否,何时以及购买,出售或持有多少。
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引用次数: 3
Assessment of Proxy-Hedging in Jet-Fuel Markets 航空燃油市场代理套期保值评估
Pub Date : 2017-10-08 DOI: 10.2139/ssrn.3049564
Marius-Cristian Frunza, D. Guégan, Rostislav Haliplii
The aim of this research is to explore the risk associated with hedging in jet fuel markets. It focuses on finding the most effective proxy hedge instrument for the Singapore spot market. Due to its particularities, this market does not exhibit the same features as traditional financial markets do. In appearance, it seems very related to the oil market, but in reality it exhibits insufficient liquidity and shows unusual volatility clustering effects. This behavior has a direct impact on the hedging strategies of refineries, airline companies and jet fuel traders. The paper explores the econometric features of the jet fuel price and underlines the need of fat tail distributions and volatility clustering models. Also, it examines the density forecasting capacity of various proxy hedge instruments including kerosene, crude and gasoil futures. The results show that Singapore Gasoil Futures contract is the best candidate for hedging the Singapore Jet Fuel spot price.
本研究的目的是探讨与对冲相关的风险在航空燃油市场。它专注于为新加坡现货市场寻找最有效的代理对冲工具。由于其特殊性,这个市场不像传统金融市场那样表现出相同的特征。从表面上看,它似乎与石油市场非常相关,但实际上它表现出流动性不足,并表现出异常的波动聚类效应。这种行为对炼油厂、航空公司和喷气燃料交易商的对冲策略有直接影响。本文探讨了航空燃油价格的计量经济学特征,强调了胖尾分布和波动聚类模型的必要性。此外,它还检验了各种代理对冲工具(包括煤油、原油和汽油期货)的密度预测能力。结果表明,新加坡轻油期货合约是对冲新加坡航油现货价格的最佳选择。
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引用次数: 1
Implied Volatility and Stock Market Speculation 隐含波动率与股票市场投机
Pub Date : 2017-09-21 DOI: 10.2139/ssrn.3040470
Ramesh Thimmaraya, Venkateshwarlu Masuna
The stability of an economy is directly linked to the stability of the capital markets in which it operates and vice versa. The capital market stability is in turn linked to the asset price dynamics; most of these asset prices are modelled based on expected rate of return. The expected rate of return and direction of markets is determined from the implied market volatility (VIX index). The implied volatility is a forward looking variable which tells about the realised market volatility based of market participant’s expectations. Most of the times this implied volatility is over estimated compared to the realised volatility due to the speculative behaviour of the market participants. This speculative behaviour causes virtual dynamics in the implied variables which in turn caused virtual dynamics in the individual asset prices. The virtual dynamics in the asset prices causes the divergence in the realised or fundamental value of the market; which can be attributed to the irrational behavioural of the financial market participants. The present paper aims at understanding the source and level of the speculation, and also an attempt has been made to develop a novel quantitative behavioral framework to understand and rectify this speculative behaviour. An empirical analysis has been carried out on the S&P 500 Index and CBOE VIX Index to validate the proposed model. Some interesting results have been obtained from the present study which clearly shows the quantitative behavioural model has the capability to convergence the expected volatility with the realised market volatility, this helps the market participants, regulators and policy makers to make necessary corrections based on the predicted speculation.
一个经济体的稳定与其所处的资本市场的稳定直接相关,反之亦然。资本市场的稳定性反过来又与资产价格动态有关;这些资产价格大多是基于预期回报率建立模型的。预期收益率和市场走向由隐含市场波动率(VIX指数)决定。隐含波动率是一个前瞻性变量,它反映了基于市场参与者预期的已实现的市场波动率。大多数时候,由于市场参与者的投机行为,与实际波动率相比,隐含波动率被高估了。这种投机行为导致隐含变量的虚拟动态,进而导致单个资产价格的虚拟动态。资产价格的虚拟动态导致市场实现价值或基本价值的背离;这可以归因于金融市场参与者的非理性行为。本文旨在了解投机行为的来源和水平,并尝试开发一种新的定量行为框架来理解和纠正这种投机行为。通过对标准普尔500指数和芝加哥期权交易所VIX指数的实证分析,验证了模型的有效性。从本研究中获得了一些有趣的结果,清楚地表明定量行为模型具有将预期波动与实际市场波动收敛的能力,这有助于市场参与者,监管机构和政策制定者根据预测的投机行为进行必要的修正。
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引用次数: 0
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