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Articles 4651 - 4680 of 9289

Full-Text Articles in Social and Behavioral Sciences

A Martingale Difference-Divergence-Based Test For Specification, Liangjun Su, Xin Zheng May 2017

A Martingale Difference-Divergence-Based Test For Specification, Liangjun Su, Xin Zheng

Research Collection School Of Economics

In this paper we propose a novel consistent model specification test based on the martingale difference divergence (MDD) of the error term given the covariates. The MDD equals zero if and only if error term is conditionally mean independent of the covariates. Our MDD test does not require any nonparametric estimation under the alternative and it is applicable even if we have many covariates in the regression model. We establish the asymptotic distributions of our test statistic under the null and a sequence of Pitman local alternatives converging to the null at the usual parametric rate. Simulations suggest that our …

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Improved Likelihood Inferences For Weibull Regression Model, Yan Shen, Zhenlin Yang May 2017

Improved Likelihood Inferences For Weibull Regression Model, Yan Shen, Zhenlin Yang

Research Collection School Of Economics

A general procedure is developed for bias-correcting the maximum likelihood estimators (MLEs) of the parameters of Weibull regression model with either complete or right-censored data. Following the bias correction, variance corrections and hence improved t-ratios for model parameters are presented. Potentially improved t-ratios for other reliability-related quantities are also discussed. Simulation results show that the proposed method is effective in correcting the bias of the MLEs, and the resulted t-ratios generally improve over the regular t-ratios.

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Monetary Policy And Energy Price Shocks, Bao Tan Huynh May 2017

Monetary Policy And Energy Price Shocks, Bao Tan Huynh

Research Collection School Of Economics

A New Keynesian framework with endogenous energy production is proposed to investigate the role of monetary policy in addressing disturbances in energy markets. The novelty of the model lies in the endogenous production of energy with convex costs, explicit modeling of goods with different degrees of energy-dependency and sectoral price rigidities. Our analyses prescribe the desirable monetary responses to four types of energy price shocks, highlighting the distinct characteristics of each shock and affirming the need for diverse policy considerations. We also found several points of divergence in relation to previous studies on addressing energy supply shocks. In addition, we …

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Robust Jump Regressions, Jia Li, Viktor Todorov, George Tauchen May 2017

Robust Jump Regressions, Jia Li, Viktor Todorov, George Tauchen

Research Collection School Of Economics

We develop robust inference methods for studying linear dependence between the jumps of discretely observed processes at high frequency. Unlike classical linear regressions, jump regressions are determined by a small number of jumps occurring over a fixed time interval and the rest of the components of the processes around the jump times. The latter are the continuous martingale parts of the processes as well as observation noise. By sampling more frequently the role of these components, which are hidden in the observed price, shrinks asymptotically. The robustness of our inference procedure is with respect to outliers, which are of particular …

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Love, Money, And Parental Goods: Does Parental Matchmaking Matter?, Fali Huang, Ginger Zhe Xu, Lixin Colin Xu May 2017

Love, Money, And Parental Goods: Does Parental Matchmaking Matter?, Fali Huang, Ginger Zhe Xu, Lixin Colin Xu

Research Collection School Of Economics

While parental matchmaking has been widespread throughout history and across countries, we know little about the relationship between parental matchmaking and marriage outcomes. Does parental involvement in matchmaking help ensure their needs are better taken care of by married children? This paper finds supportive evidence using a survey of Chinese couples. In particular, parental involvement in matchmaking is associated with having a more submissive wife, a greater number of children, a higher likelihood of having any male children, and a stronger belief of the husband in providing old age support to his parents. These benefits, however, are achieved at the …

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Stefano Harney: In Conversation With The Co-Author Of The Undercommons’ With Michael Schapira And Jesse Montgomery, Michael Schapira, Jesse Montgomery Montgomery, Stephen Matthias Harney May 2017

Stefano Harney: In Conversation With The Co-Author Of The Undercommons’ With Michael Schapira And Jesse Montgomery, Michael Schapira, Jesse Montgomery Montgomery, Stephen Matthias Harney

Research Collection Lee Kong Chian School Of Business

‘In Conversation with the Co-author of The Undercommons’ with Michael Schapira and Jesse Montgomery, Full-Stop Quarterly, May 2017 http://www.full-stop.net/quarterly/

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The Value Of Trading Relations In Turbulent Times, Marco Di Maggio, Amir Kermani, Zhaogang Song May 2017

The Value Of Trading Relations In Turbulent Times, Marco Di Maggio, Amir Kermani, Zhaogang Song

Research Collection Lee Kong Chian School Of Business

This paper investigates how dealers’ trading relations shape their trading behavior in the corporate bond market. Dealers charge lower spreads to dealers with whom they have the strongest ties and more so during periods of market turmoil. Systemically important dealers exploit their connections at the expense of peripheral dealers as well as clients, charging higher markups than to other core dealers. Also, intermediation chains lengthened by 20% following the collapse of a flagship dealer in 2008 and even more for institutions strongly connected to this dealer. Finally, dealers drastically reduced their inventory during the crisis.

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Neighborhood Segregation And Black Entrepreneurship, Eric Fesselmeyer, Kiat Ying Seah May 2017

Neighborhood Segregation And Black Entrepreneurship, Eric Fesselmeyer, Kiat Ying Seah

Research Collection College of Integrative Studies

We examine the causal effect of neighborhood segregation on black entrepreneurship. We address neighborhood sorting by analyzing city averages and omitted variable bias by instrumenting for segregation using historical railroad configurations. We find that segregation has a significant positive effect: a 10 percentage point increase in the dissimilarity index decreases the racial gap by about 3.3 percentage points. To minimize the effect of cross-city sorting, we use a narrower sample constructed from outcomes of young adults and find a similar effect. Our findings are importantbecause historically, entrepreneurship has been an avenue out of poverty, and entrepreneurship has been promoted as …

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Singapore’S Life Program: Actuarial Framework, Longevity Risk And Impact Of Annuity Fund Return, Koon Shing Kwong, Yiu Kuen Tse, Wai-Sum Chan May 2017

Singapore’S Life Program: Actuarial Framework, Longevity Risk And Impact Of Annuity Fund Return, Koon Shing Kwong, Yiu Kuen Tse, Wai-Sum Chan

Research Collection School Of Economics

The Central Provident Fund (CPF) is a defined-contribution savings plan forming the key pillar of the pension system in Singapore. The CPF Lifelong Income For the Elderly (LIFE) program, which provides lifetime income for retirees, is a mandatory pension scheme for all Singapore residents. In this paper we construct an actuarial framework to analyze the LIFE program. We use this framework to study the plan payout outcomes with respect to changes in mortality and annuity fund return assumptions. We also examine the effects of some possible changes in the program on the payouts and bequests.

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Fusing Social Media And Mobile Analytics For Urban Sense-Making, Archan Misra May 2017

Fusing Social Media And Mobile Analytics For Urban Sense-Making, Archan Misra

Research Collection School Of Computing and Information Systems

The project was motivated by the observation that urban environments are increasingly characterized by a variety of non-traditional “sensors”, whose data streams can be harnessed to infer a variety of latent events and urban context. For example, users spontaneously generate huge amounts of content (text, images and video) on social network channels, whereas GPS & other sensors on taxis and buses increasingly provide near-real time traces of their movement throughout the city. Similarly, advances in Wi-Fi based sensing allow us to passively capture the individual and collective movement of visitors across various public spaces, such as college campuses, museums and …

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Persona Generation From Aggregated Social Media Data, Soon-Gyo Jung, Jisun An, Haewoon Kwak, Moeed Ahmad, Lene Nielsen, Bernard J. Jansen May 2017

Persona Generation From Aggregated Social Media Data, Soon-Gyo Jung, Jisun An, Haewoon Kwak, Moeed Ahmad, Lene Nielsen, Bernard J. Jansen

Research Collection School Of Computing and Information Systems

We develop a methodology for persona generation using real time social media data for the distribution of products via online platforms. From a large social media account containing more than 30 million interactions from users from 181 countries engaging with more than 4,200 digital products produced by a global media corporation, we demonstrate that our methodology can first identify both distinct and impactful user segments and then create persona descriptions by automatically adding pertinent features, such as names, photos, and personal attributes. We validate our approach by implementing the methodology into an actual working system that leverages large scale online …

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How Should Bare Arbitration Clauses Be Enforced By The Courts?, Darius Chan Apr 2017

How Should Bare Arbitration Clauses Be Enforced By The Courts?, Darius Chan

Research Collection Yong Pung How School Of Law

No abstract provided.

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East Asia Pacific Economies: Looking Good, Singapore Management University Apr 2017

East Asia Pacific Economies: Looking Good, Singapore Management University

Perspectives@SMU

The World Bank expects recovering global trade and commodity prices to buoy regional prospects

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Will Politics Trump Economic Growth?, Singapore Management University Apr 2017

Will Politics Trump Economic Growth?, Singapore Management University

Perspectives@SMU

While economic uncertainties remain, investors should not worry about the White House jeopardising the U.S. economy

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Chinese Company Shareholders Revolt Against Communist Control, Singapore Management University Apr 2017

Chinese Company Shareholders Revolt Against Communist Control, Singapore Management University

Perspectives@SMU

Shareholders of low-profile Chinese property developer Tianjin Realty Development recently made news by voting to keep party politics out of the Shanghai-listed company's organisational structure. Such action has never been heard of before at any State-Owned Enterprise (SOE) in the history of China's economic modernisation.

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Smu Libraries: “Sensory” In Library Spaces, Nursyeha Yahaya, Devika Sangaram, Salihin Mohammed Ali, Aaron Tay Apr 2017

Smu Libraries: “Sensory” In Library Spaces, Nursyeha Yahaya, Devika Sangaram, Salihin Mohammed Ali, Aaron Tay

Research Collection Library

The Li Ka Shing Library recently included a new section, “Heat Maps” on the library website, providing users instant access to the physical occupancy spaces across all the different levels in the library. The indoor location-aware system is one in the latest slew of additions in tracking the library patrons’ visitations. It is the first of the many forms of library usage data sources that seek to provide an impetus in engaging the SMU community through real-time data visualizations. This enhances the perception of SMU Libraries as a creative nexus that nurtures and champions innovative methods of information access through …

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Do Faculty And Librarians See Information Literacy In The Same Way? A Study Of Alignment, Melody Chin, Daniel Walker Apr 2017

Do Faculty And Librarians See Information Literacy In The Same Way? A Study Of Alignment, Melody Chin, Daniel Walker

Research Collection Library

Faculty and Librarians are two distinct professional groups each with their own subcultures, values and experiences. Hardesty (1995) noted the existence of a "faculty culture" amongst faculty members, which quite likely shapes and influences the way these individuals perceive a highly subjective concept such as Information Literacy (IL). Faculty and Librarians in higher education institutions often work together in the development of IL Programs. However, despite this collaborative relationship, it is not clear as to whether the two professional groups perceive the concept of IL similarly, or whether there exists a divide. Understanding how both professions perceive IL should be …

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Fostering Parasocial Relationships With Celebrities On Social Media: Implications For Celebrity Endorsement, Siyoung Chung, Hichang Cho Apr 2017

Fostering Parasocial Relationships With Celebrities On Social Media: Implications For Celebrity Endorsement, Siyoung Chung, Hichang Cho

Research Collection Lee Kong Chian School of Business

The purpose of this study was to explore the underlying mechanisms through which the use of social media affects endorser effectiveness. Based on theories related to parasocial relationships,self-disclosure, and celebrity endorsement, this study proposed a theoretical research model and empirically tested the model using online survey data collected from 400 Korean Wave fans in Singapore. The results showed that consumers’ parasocial interactions with celebrities though social media have a positive impact on celebrity endorsement. Specifically, we found that: (1) parasocial relationships mediated the relationships between social media interactions and source trustworthiness, (2) social media interactions influenced parasocial relationships via self-disclosure;and …

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Pay For Performance: What Type Of Pay Scheme Is Best For Achieving Business Results?, Fermin Augusto Diez Apr 2017

Pay For Performance: What Type Of Pay Scheme Is Best For Achieving Business Results?, Fermin Augusto Diez

Dissertations and Theses Collection

Much has been written, for and against, about compensation as a driver of performance. Two main theoretical constructs deal with this subject: extrinsic theory, including agency theory, whereby money is a main motivator to performance, and intrinsic theory which proposes that money does not motivate, and in fact may hinder, performance. However, corporations spend considerable effort in designing compensation packages with the objective of linking remuneration to performance. Practitioners have developed a variety of mechanisms to deliver pay packages, but heretofore there has been no attempt to validate which, if any, of these various approaches is better able to drive …

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Grooming The Future Disruptive Accounting Professionals, Gary Pan, Gan Hup Tan, Poh Sun Seow Apr 2017

Grooming The Future Disruptive Accounting Professionals, Gary Pan, Gan Hup Tan, Poh Sun Seow

Research Collection School Of Accountancy

In this chapter, we will discuss how SMU brought about innovation changes in the university’s learning environment. In 2011, a steering committee was set up by SMU President, Professor Arnoud De Meyer to develop strategies that focused on innovation in learning pedagogy at the university. Subsequent brainstorming sessions led to the evolution of the SMU-X programme, which aimed to broaden the scope of university education by encompassing real life problems and problem-solving skills in the curriculum. The concept encompassed three key elements: mindset, pedagogy, and physical space. The challenge was to offer more applied learning with close coordination between classroom …

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Enhancing Singapore’S Pension Scheme: A Blueprint For Further Flexibility, Koon Shing Kwong, Yiu Kuen Tse, Wai Sum Chan Apr 2017

Enhancing Singapore’S Pension Scheme: A Blueprint For Further Flexibility, Koon Shing Kwong, Yiu Kuen Tse, Wai Sum Chan

Research Collection School of Economics

Building a social security system to ensure Singapore residents have peace of mind in funding for retirement has been at the top of Singapore government’s policy agenda over the last decade. Implementation of the Lifelong Income For the Elderly (LIFE) scheme in 2009 clearly shows that the government spares no effort in improving its pension scheme to boost its residents’ income after retirement. Despite the recent modifications to the LIFE scheme, Singapore residents must still choose between two plans: the Standard and Basic plans. To enhance the flexibility of the LIFE scheme with further streamlining of its fund management, we …

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Predicting The Impact Of Software Engineering Topics: An Empirical Study, Santonu Sarkar, Rumana Lakdawala, Subhajit Datta Apr 2017

Predicting The Impact Of Software Engineering Topics: An Empirical Study, Santonu Sarkar, Rumana Lakdawala, Subhajit Datta

Research Collection School Of Computing and Information Systems

Predicting the future is hard, more so in active research areas. In this paper, we customize an established model for citation prediction of research papers and apply it on research topics. We argue that research topics, rather than individual publications, have wider relevance in the research ecosystem, for individuals as well as organizations. In this study, topics are extracted from a corpus of software engineering publications covering 55,000+ papers written by more than 70,000 authors across 56 publication venues, over a span of 38 years, using natural language processing techniques. We demonstrate how critical aspects of the original paper-based prediction …

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On Analyzing User Topic-Specific Platform Preferences Across Multiple Social Media Sites, Roy Ka Wei Lee, Tuan Anh Hoang, Ee Peng Lim Apr 2017

On Analyzing User Topic-Specific Platform Preferences Across Multiple Social Media Sites, Roy Ka Wei Lee, Tuan Anh Hoang, Ee Peng Lim

Research Collection School Of Computing and Information Systems

Topic modeling has traditionally been studied for single text collections and applied to social media data represented in the form of text documents. With the emergence of many social media platforms, users find themselves using different social media for posting content and for social interaction. While many topics may be shared across social media platforms, users typically show preferences of certain social media platform(s) over others for certain topics. Such platform preferences may even be found at the individual level. To model social media topics as well as platform preferences of users, we propose a new topic model known as …

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Now You See It, Now You Don't! A Study Of Content Modification Behavior In Facebook, Fuxiang Chen, Ee-Peng Lim Apr 2017

Now You See It, Now You Don't! A Study Of Content Modification Behavior In Facebook, Fuxiang Chen, Ee-Peng Lim

Research Collection School Of Computing and Information Systems

Social media, as a major platform to disseminate information, has changed the way users and communities contribute content. In this paper, we aim to study content modifications on public Facebook pages operated by news media, community groups, and bloggers. We also study the possible reasons behind them, and their effects on user interaction. We conducted a detailed study of Content Censorship (CC) and Content Edit (CE) in Facebook using a detailed longitudinal dataset consisting of 57 public Facebook pages over 3 weeks covering 145,955 posts and 9,379,200 comments. We detected many CC and CE activities between 28% and 56% of …

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Collective Entity Linking In Tweets Over Space And Time, Wen Haw Chong, Ee-Peng Lim, William Cohen Apr 2017

Collective Entity Linking In Tweets Over Space And Time, Wen Haw Chong, Ee-Peng Lim, William Cohen

Research Collection School Of Computing and Information Systems

We propose collective entity linking over tweets that are close in space and time. This exploits the fact that events or geographical points of interest often result in related entities being mentioned in spatio-temporal proximity. Our approach directly applies to geocoded tweets. Where geocoded tweets are overly sparse among all tweets, we use a relaxed version of spatial proximity which utilizes both geocoded and non-geocoded tweets linked by common mentions. Entity linking is affected by noisy mentions extracted and incomplete knowledge bases. Moreover, to perform evaluation on the entity linking results, much manual annotation of mentions is often required. To …

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Modeling Topics And Behavior Of Microbloggers: An Integrated Approach, Tuan Anh Hoang, Ee-Peng Lim Apr 2017

Modeling Topics And Behavior Of Microbloggers: An Integrated Approach, Tuan Anh Hoang, Ee-Peng Lim

Research Collection School Of Computing and Information Systems

Microblogging encompasses both user-generated content and behavior. When modeling microblogging data, one has to consider personal and background topics, as well as how these topics generate the observed content and behavior. In this article, we propose the Generalized Behavior-Topic (GBT) model for simultaneously modeling background topics and users' topical interest in microblogging data. GBT considers multiple topical communities (or realms) with different background topical interests while learning the personal topics of each user and the user's dependence on realms to generate both content and behavior. This differentiates GBT from other previous works that consider either one realm only or content …

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Vulnerabilities, Attacks, And Countermeasures In Balise-Based Train Control Systems, Yongdong Wu, Jian Weng, Zhe Tang, Xin Li, Robert H. Deng Apr 2017

Vulnerabilities, Attacks, And Countermeasures In Balise-Based Train Control Systems, Yongdong Wu, Jian Weng, Zhe Tang, Xin Li, Robert H. Deng

Research Collection School Of Computing and Information Systems

In modern rail transport systems, balises are widely used to exchange track-train information via air-gap interface. In this paper, we first present the vulnerabilities on the standard balise air-gap interface, and then conduct vulnerability simulations using the system parameters that were specified in the European Train Control System. The simulation results show that the vulnerabilities can be exploited to launch effective and practical attacks, which could lead to catastrophic consequences, such as train derailment or collision. To mitigate the vulnerabilities and attacks, we propose to implement a challenge-response authentication process in the air-gap interface in the existing transport infrastructure.

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Why Knowledge Is Special, Shane Ryan Apr 2017

Why Knowledge Is Special, Shane Ryan

Research Collection School of Social Sciences

I argue against Greco's account of the value of knowledge, according to which knowledge is distinctively valuable vis-a-vis that which falls short of knowledge in virtue of its status as an achievement and achievements being finally valuable. Instead, I make the case that virtuous belief is also an achievement. I argue that the nature of knowledge is such that knowledge is finally valuable in a way that virtuous belief is not, precisely because knowledge is not simply a success from ability. The value of knowledge lies in the positive responsiveness of the world to an agent's epistemic virtuousness.

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Estimating Intra-Party Preferences: Comparing Speeches To Votes, Daniel Schwarz, Denise Traber, Kenneth Benoit Apr 2017

Estimating Intra-Party Preferences: Comparing Speeches To Votes, Daniel Schwarz, Denise Traber, Kenneth Benoit

Research Collection School of Social Sciences

Well-established methods exist for measuring party positions, but reliable means for estimating intra-party preferences remain underdeveloped. While most efforts focus on estimating the ideal points of individual legislators based on inductive scaling of roll call votes, this data suffers from two problems: selection bias due to unrecorded votes and strong party discipline, which tends to make voting a strategic rather than a sincere indication of preferences. By contrast, legislative speeches are relatively unconstrained, as party leaders are less likely to punish MPs for speaking freely as long as they vote with the party line. Yet, the differences between roll call …

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A Member Saved Is A Member Earned? The Recruitment-Retention Trade-Off And Organizational Strategies For Membership Growth, Yongren Shi, Fedor A. Dokshin, Michael Genkin, Matthew E. Brashears Apr 2017

A Member Saved Is A Member Earned? The Recruitment-Retention Trade-Off And Organizational Strategies For Membership Growth, Yongren Shi, Fedor A. Dokshin, Michael Genkin, Matthew E. Brashears

Research Collection School of Social Sciences

A long line of research documents the essential role of social networks in mediating the recruitment and retention of members in organizations. But organizations also comprise a primary context where people form social ties. We investigate how the network structure an organization creates among its members influences its ability to grow and reproduce. In particular, we propose that two dimensions of organizational strategy influence affiliation dynamics: (1) the extent to which an organization induces social interaction among its members (social encapsulation), and (2) the time and energy that an organization demands of its members (time and energy demand). We examine …

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