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Approach Or Avoidance (Or Both?): Integrating Core Self-Evaluations Within An Approach/Avoidance Framework, D. Lance Ferris, Christopher R. Rosen, Russell E. Johnson, Douglas J. Brown, Stephen D. Risavy, Daniel Heller Mar 2011

Approach Or Avoidance (Or Both?): Integrating Core Self-Evaluations Within An Approach/Avoidance Framework, D. Lance Ferris, Christopher R. Rosen, Russell E. Johnson, Douglas J. Brown, Stephen D. Risavy, Daniel Heller

Research Collection Lee Kong Chian School Of Business

Core self‐evaluations (CSE) represent a new personality construct that, despite an accumulation of evidence regarding its predictive validity, provokes debate regarding the fundamental approach or avoidance nature of the construct. This set of studies sought to clarify the approach/avoidance nature of CSE by examining its relation with approach/avoidance personality traits and motivation constructs (Study 1); we subsequently examined approach/avoidance motivational mechanisms as mediators of the relation between CSE and job performance (Study 2). Overall, the studies demonstrate that CSE is best conceptualized as representing both (high) approach tendencies and (low) avoidance tendencies; implications of these findings for CSE theory are …

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The Politics Of Identity In Indonesia: Results From Political Campaign Advertisements, Colm A. Fox, Jeremy Menchik Mar 2011

The Politics Of Identity In Indonesia: Results From Political Campaign Advertisements, Colm A. Fox, Jeremy Menchik

Research Collection School of Social Sciences

Despite the many benefits of democracy, a number of scholars have cited the dangers of introducing democratic elections in ethnically divided states. One of the biggest fears is the politicization of identity. However, very little research has systematically studied the particular conditions that compel politicians to make identity appeals. Taking the case of an ethnically diverse new democracy, Indonesia, this paper attempts just that. To measure identity appeals it takes the novel approach of drawing on political campaign posters. Between 2009 and 2011 over 4,000 political campaign posters were gathered from legislative and executive elections across hundreds of electoral districts …

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Consolidating Information In Option Transactions, Richard Holowczak, Jianfeng Hu, Liuren Wu Mar 2011

Consolidating Information In Option Transactions, Richard Holowczak, Jianfeng Hu, Liuren Wu

Research Collection Lee Kong Chian School Of Business

Underlying each stock trades hundreds of options at different strike prices and maturities. The order flows from these option transactions reveal important information about the underlying stock price. How to aggregate the trade information of different option contracts underlying the same stock presents an interesting and important question for developing microstructure theories and price discovery mechanisms in the derivatives markets. This paper takes options on QQQQ, the Nasdaq 100 tracking stock, as an example and examines different order flow consolidation mechanisms in terms of their effectiveness in extracting information about the underlying stock price and volatility movements. The analysis leads …

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Art For Reward's Sake: Visual Art Recruits The Ventral Striatum, Simon Lacey, Henrik Hagvedt, Vanessa Patrick, Amy Anderson, Randall Stilla, Gopikrishna Deshpande, Hu Xioping, Joao Sato, Srinivas K. Reddy, Krish Sathian Mar 2011

Art For Reward's Sake: Visual Art Recruits The Ventral Striatum, Simon Lacey, Henrik Hagvedt, Vanessa Patrick, Amy Anderson, Randall Stilla, Gopikrishna Deshpande, Hu Xioping, Joao Sato, Srinivas K. Reddy, Krish Sathian

Research Collection Lee Kong Chian School Of Business

A recent study showed that people evaluate products more positively when they are physically associated with art images than similar non-art images. Neuroimaging studies of visual art have investigated artistic style and esthetic preference but not brain responses attributable specifically to the artistic status of images. Here we tested the hypothesis that the artistic status of images engages reward circuitry, using event-related functional magnetic resonance imaging (fMRI) during viewing of art and non-art images matched for content. Subjects made animacy judgments in response to each image. Relative to non-art images, art images activated, on both subject- and item-wise analyses, reward-related …

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Rising Asian Powers And Changing Global Governance, Ann Florini Mar 2011

Rising Asian Powers And Changing Global Governance, Ann Florini

Research Collection School of Social Sciences

International Relations (IR) scholarship is directly in the path of two simultaneous tidal waves. The first is the rise of China and India in the traditional IR terms of military and economic power. The second is the expanding nature of what IR scholarship needs to address, as global integration transforms the nature of the issues to be addressed and numerous trends expand the number and types of relevant actors. Neither theory nor practice is yet coping well with the profound implications of these fundamental changes. Investigating what kind of a world order might emerge from these two simultaneous tsunamis will …

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How Can A Chinese Democracy Be Pragmatic?, Sor-Hoon Tan Mar 2011

How Can A Chinese Democracy Be Pragmatic?, Sor-Hoon Tan

Research Collection School of Social Sciences

Early in the last century, some of John Dewey's Chinese students had a chance to influence the fate of the first Chinese Republic. These individuals, Hu Shih being the most prominent example, were identified as Chinese liberals in the political spectrum of that time and advocated education reforms as the chief means of "saving China." Despite the hope for radical social change engendered by the New Culture Movement, education reforms failed, and cultural transformation did not lead in a democratic direction, at least not a Pragmatic democracy as conceived by Dewey. A century later, China is again going through a …

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Within- And Between-Culture Variation: Individual Differences And The Cultural Logics Of Honor, Face, And Dignity Cultures, Angela K.-Y. Leung, Dov Cohen Mar 2011

Within- And Between-Culture Variation: Individual Differences And The Cultural Logics Of Honor, Face, And Dignity Cultures, Angela K.-Y. Leung, Dov Cohen

Research Collection School of Social Sciences

The CuPS (Culture × Person × Situation) approach attempts to jointly consider culture and individual differences, without treating either as noise and without reducing one to the other. Culture is important because it helps define psychological situations and create meaningful clusters of behavior according to particular logics. Individual differences are important because individuals vary in the extent to which they endorse or reject a culture's ideals. Further, because different cultures are organized by different logics, individual differences mean something different in each. Central to these studies are concepts of honor-related violence and individual worth as being inalienable versus socially conferred. …

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Chameleon All-But-One Tdfs And Their Application To Chosen-Ciphertext Security, Junzuo Lai, Robert H. Deng, Shengli Liu Mar 2011

Chameleon All-But-One Tdfs And Their Application To Chosen-Ciphertext Security, Junzuo Lai, Robert H. Deng, Shengli Liu

Research Collection School Of Computing and Information Systems

In STOC’08, Peikert and Waters introduced a new powerful primitive called lossy trapdoor functions (LTDFs) and a richer abstraction called all-but-one trapdoor functions (ABO-TDFs). They also presented a black-box construction of CCA-secure PKE from an LTDF and an ABO-TDF. An important component of their construction is the use of a strongly unforgeable one-time signature scheme for CCA-security.In this paper, we introduce the notion of chameleon ABO-TDFs, which is a special kind of ABO-TDFs. We give a generic as well as a concrete construction of chameleon ABO-TDFs. Based on an LTDF and a chameleon ABO-TDF, we presented a black-box construction, free …

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Secure Mobile Subscription Of Sensor-Encrypted Data, Cheng-Kang Chu, Wen-Tao Zhu, Sherman S. M. Chow, Jianying Zhou, Robert H. Deng Mar 2011

Secure Mobile Subscription Of Sensor-Encrypted Data, Cheng-Kang Chu, Wen-Tao Zhu, Sherman S. M. Chow, Jianying Zhou, Robert H. Deng

Research Collection School Of Computing and Information Systems

In an end-to-end encryption model for a wireless sensor network (WSN), the network control center preloads encryption and decryption keys to the sensor nodes and the subscribers respectively, such that a subscriber can use a mobile device in the deployment field to decrypt the sensed data encrypted by the more resource-constrained sensor nodes. This paper proposes SMS-SED, a provably secure yet practically efficient key assignment system featuring a discrete time-based access control, to better support a business model where the sensors deployer rents the WSN to customers who desires a higher flexibility beyond subscribing to strictly consecutive periods. In SMS-SED, …

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Elephants In The Room: Challenges Of Integrating China Into The Wto System, Henry S. Gao Mar 2011

Elephants In The Room: Challenges Of Integrating China Into The Wto System, Henry S. Gao

Research Collection Yong Pung How School Of Law

Since China’s accession to the WTO in late 2001, one of the most intriguing questions for trade analysts has been whether the “new kid on the block” would seek to disrupt the status quo in the WTO upon its entry. This paper answers the question by reviewing China’s participation in two key activities of the WTO, i.e., trade negotiations and dispute settlement, as well as another important component of global trade governance: regional trade agreements (RTAs). Drawing from an in-depth study of China’s record in these activities, the author argues that, overall, China has transformed from a passive “taker” of …

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Deckard - A Tree-Based, Scalable, And Accurate Code Clone Detection Tool (Version 1.2.1), Lingxiao Jiang, Ghassan Misherghi, Zhendong Su, Glondu Stephane Feb 2011

Deckard - A Tree-Based, Scalable, And Accurate Code Clone Detection Tool (Version 1.2.1), Lingxiao Jiang, Ghassan Misherghi, Zhendong Su, Glondu Stephane

SMU Research Data

Deckard is a tree-based, scalable, and accurate code clone detection tool. It is also capable of reporting clone-related bugs. For more information, pls refer to readme.txt. The latest version is available from Deckard repository on Github. https://github.com/skyhover/Deckard

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When Are Analyst Recommendation Changes Influential?, Roger Loh, Rene M. Stulz Feb 2011

When Are Analyst Recommendation Changes Influential?, Roger Loh, Rene M. Stulz

Research Collection Lee Kong Chian School Of Business

The existing literature measures the contribution of analyst recommendation changes using average stock-price reactions. With such an approach, recommendation changes can have a significant impact even if no recommendation has a visible stock-price impact. Instead, we call a recommendation change influential only if it affects the stock price of the affected firm visibly. We show that only 12% of recommendation changes are influential. Recommendation changes are more likely to be influential if they are from leader, star, previously influential analysts, issued away from consensus, accompanied by earnings forecasts, and issued on growth, small, high institutional ownership, or high forecast dispersion …

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Explosive Behavior In The 1990s Nasdaq: When Did Exuberance Escalate Asset Values?, Peter C. B. Phillips, Yangru Wu, Jun Yu Feb 2011

Explosive Behavior In The 1990s Nasdaq: When Did Exuberance Escalate Asset Values?, Peter C. B. Phillips, Yangru Wu, Jun Yu

Research Collection School Of Economics

A recursive test procedure is suggested that provides a mechanism for testing explosive behavior, date stamping the origination and collapse of economic exuberance, and providing valid confidence intervals for explosive growth rates. The method involves the recursive implementation of a right-side unit root test and a sup test, both of which are easy to use in practical applications, and some new limit theory for mildly explosive processes. The test procedure is shown to have discriminatory power in detecting periodically collapsing bubbles, thereby overcoming a weakness in earlier applications of unit root tests for economic bubbles. An empirical application to the …

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Fraud Detection In Online Consumer Reviews, Nan Hu, Ling Liu, Vallbh Sambamurthy Feb 2011

Fraud Detection In Online Consumer Reviews, Nan Hu, Ling Liu, Vallbh Sambamurthy

Research Collection School Of Computing and Information Systems

Increasingly, consumers depend on social information channels, such as user-posted online reviews, to make purchase decisions. These reviews are assumed to be unbiased reflections of other consumers' experiences with the products or services. While extensively assumed, the literature has not tested the existence or non-existence of review manipulation. By using data from Amazon and Barnes & Noble, our study investigates if vendors, publishers, and writers consistently manipulate online consumer reviews. We document the existence of online review manipulation and show that the manipulation strategy of firms seems to be a monotonically decreasing function of the product's true quality or the …

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A Two-View Learning Approach For Image Tag Ranking, Jinfeng Zhuang, Steven C. H. Hoi Feb 2011

A Two-View Learning Approach For Image Tag Ranking, Jinfeng Zhuang, Steven C. H. Hoi

Research Collection School Of Computing and Information Systems

Tags of social images play a central role for text-based social image retrieval and browsing tasks. However, the original tags annotated by web users could be noisy, irrelevant, and often incomplete for describing the image contents, which may severely deteriorate the performance of text-based image retrieval models. In this paper, we aim to overcome the challenge of social tag ranking for a corpus of social images with rich user-generated tags by proposing a novel two-view learning approach. It can effectively exploit both textual and visual contents of social images to discover the complicated relationship between tags and images. Unlike the …

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Adnext: A Visit-Pattern-Aware Mobile Advertising System For Urban Commercial Complexes, Byoungjip Kim, Jin-Young Ha, Sangjeong Lee, Seungwoo Kang, Youngki Lee, Yunseok Rhee, Lama Nachman, Junehwa Song Feb 2011

Adnext: A Visit-Pattern-Aware Mobile Advertising System For Urban Commercial Complexes, Byoungjip Kim, Jin-Young Ha, Sangjeong Lee, Seungwoo Kang, Youngki Lee, Yunseok Rhee, Lama Nachman, Junehwa Song

Research Collection School Of Computing and Information Systems

As smartphones have become prevalent, mobile advertising is getting significant attention as being not only a killer application in future mobile commerce, but also as an important business model of emerging mobile applications to monetize them. In this paper, we present AdNext, a visit-pattern-aware mobile advertising system for urban commercial complexes. AdNext can provide highly relevant ads to users by predicting places that the users will next visit. AdNext predicts the next visit place by learning the sequential visit patterns of commercial complex users in a collective manner. As one of the key enabling techniques for AdNext, we develop a …

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Overcoming Learning Barriers Through Knowledge Management, Itiel E. Dror, Tamas Makany, Jonathan Kemp Feb 2011

Overcoming Learning Barriers Through Knowledge Management, Itiel E. Dror, Tamas Makany, Jonathan Kemp

Research Collection Lee Kong Chian School Of Business

The ability to learn highly depends on how knowledge is managed. Specifically, different techniques for note-taking utilize different cognitive processes and strategies. In this paper, we compared dyslexic and control participants when using linear and non-linear note-taking. All our participants were professionals working in the banking and financial sector. We examined comprehension, accuracy, mental imagery & complexity, metacognition, and memory. We found that participants with dyslexia, when using a non-linear note-taking technique outperformed the control group using linear note-taking and matched the performance of the control group using non-linear note-taking. These findings emphasize how different knowledge management techniques can avoid …

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Evolution Of Developer Collaboration On The Jazz Platform: A Study Of A Large Scale Agile Project, Subhajit Datta, Renuka Sindhgatta, Bikram Sengupta Feb 2011

Evolution Of Developer Collaboration On The Jazz Platform: A Study Of A Large Scale Agile Project, Subhajit Datta, Renuka Sindhgatta, Bikram Sengupta

Research Collection School Of Computing and Information Systems

Collaboration is a key aspect of the agile philosophy of software development. As a software system matures over iterations, trends of developer collaboration can offer valuable insights into project dynamics. In this paper, we study evolution of developer collaboration for a large scale agile project on the Jazz platform. We construct networks of collaboration based on developer affiliations across comments on work items and file changes; and then compare parameters of such networks with established results from networks of scientific collaborations. The comparisons illuminate interesting facets of developer collaboration on the Jazz platform. Such perception helps deeper understanding of the …

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Doing Good, Feeling Good: Examining The Role Of Organizational Citizenship Behaviors In Changing Mood, Theresa M. Glomb, Devasheesh P. Bhave, Andrew G. Miner, Melanie Wall Feb 2011

Doing Good, Feeling Good: Examining The Role Of Organizational Citizenship Behaviors In Changing Mood, Theresa M. Glomb, Devasheesh P. Bhave, Andrew G. Miner, Melanie Wall

Research Collection Lee Kong Chian School Of Business

This study investigates whether the altruism and courtesy dimensions of organizational citizenship behaviors (OCB) regulate mood at work. Social psychological theories of mood regulation suggest helping behaviors can improve individuals’ moods because helping others provides gratification and directs attention away from one's negative mood. We capture mood states prior to and following the enactment of OCBs using experience sampling methodology in a sample of managerial and professional employees over a 3-week period. Results suggest altruism shows a pattern consistent with mood regulation; negative moods during the prior time period are associated with altruism and positive moods in the subsequent time …

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Fraud Detection In Online Consumer Reviews, Nan Hu, Ling Liu, Vallabh Sambamurthy Feb 2011

Fraud Detection In Online Consumer Reviews, Nan Hu, Ling Liu, Vallabh Sambamurthy

Research Collection School Of Computing and Information Systems

Increasingly, consumers depend on social information channels, such as user-posted online reviews, to make purchase decisions. These reviews are assumed to be unbiased reflections of other consumers' experiences with the products or services. While extensively assumed, the literature has not tested the existence or non-existence of review manipulation. By using data from Amazon and Barnes & Noble, our study investigates if vendors, publishers, and writers consistently manipulate online consumer reviews. We document the existence of online review manipulation and show that the manipulation strategy of firms seems to be a monotonically decreasing function of the product's true quality or the …

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Mining Iterative Generators And Representative Rules For Software Specification Discovery, David Lo, Jinyan Li, Limsoon Wong, Siau-Cheng Khoo Feb 2011

Mining Iterative Generators And Representative Rules For Software Specification Discovery, David Lo, Jinyan Li, Limsoon Wong, Siau-Cheng Khoo

Research Collection School Of Computing and Information Systems

Billions of dollars are spent annually on software-related cost. It is estimated that up to 45 percent of software cost is due to the difficulty in understanding existing systems when performing maintenance tasks (i.e., adding features, removing bugs, etc.). One of the root causes is that software products often come with poor, incomplete, or even without any documented specifications. In an effort to improve program understanding, Lo et al. have proposed iterative pattern mining which outputs patterns that are repeated frequently within a program trace, or across multiple traces, or both. Frequent iterative patterns reflect frequent program behaviors that likely …

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Scaling Policy Preferences From Coded Political Texts, Will Lowe, Kenneth Benoit, Slava Mikhaylov, Michael Laver Feb 2011

Scaling Policy Preferences From Coded Political Texts, Will Lowe, Kenneth Benoit, Slava Mikhaylov, Michael Laver

Research Collection School of Social Sciences

Scholars estimating policy positions from political texts typically code words or sentences and then build left-right policy scales based on the relative frequencies of text units coded into different categories. Here we reexamine such scales and propose a theoretically and linguistically superior alternative based on the logarithm of odds-ratios. We contrast this scale with the current approach of the Comparative Manifesto Project (CMP), showing that our proposed logit scale avoids widely acknowledged flaws in previous approaches. We validate the new scale using independent expert surveys. Using existing CMP data, we show how to estimate more distinct policy dimensions, for more …

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Corrigendum To "A Gaussian Approach For Continuous Time Models Of The Short Term Interest Rate", Peter C. B. Phillips, Jun Yu Feb 2011

Corrigendum To "A Gaussian Approach For Continuous Time Models Of The Short Term Interest Rate", Peter C. B. Phillips, Jun Yu

Research Collection School Of Economics

An error is corrected in Yu and Phillips (2001) (Econometrics Journal, 4, 210-224) where a time transformation was used to induce Gaussian disturbances in the discrete time equivalent model. It is shown that the error process in this model is not a martingale and the Dambis, Dubins-Schwarz (DDS) theorem is not directly applicable. However, a detrended error process is a martingale, the DDS theorem is applicable, and the corresponding stopping time correctly induces Gaussianity. We show that the two stopping time sequences differ by O(a2), where a is the pre-specified normalized timing constant.

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Cryptanalysis Of A Certificateless Signcryption Scheme In The Standard Model, Jian Weng, Guoxiang Yao, Robert H. Deng, Min-Rong Chen, Xianxue Li Feb 2011

Cryptanalysis Of A Certificateless Signcryption Scheme In The Standard Model, Jian Weng, Guoxiang Yao, Robert H. Deng, Min-Rong Chen, Xianxue Li

Research Collection School Of Computing and Information Systems

Certificateless signcryption is a useful primitive which simultaneously provides the functionalities of certificateless encryption and certificateless signature. Recently, Liu et al. [15] proposed a new certificateless signcryption scheme, and claimed that their scheme is provably secure without random oracles in a strengthened security model, where the malicious-but-passive KGC attack is considered. Unfortunately, by giving concrete attacks, we indicate that Liu et al. certificateless signcryption scheme is not secure in this strengthened security model.

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Pgtp: Power Aware Game Transport Protocol For Multi-Player Mobile Games, Bhojan Anand, Jeena Sebastian, Soh Yu Ming, Akhihebbal L. Ananda, Mun Choon Chan, Rajesh Krishna Balan Feb 2011

Pgtp: Power Aware Game Transport Protocol For Multi-Player Mobile Games, Bhojan Anand, Jeena Sebastian, Soh Yu Ming, Akhihebbal L. Ananda, Mun Choon Chan, Rajesh Krishna Balan

Research Collection School Of Computing and Information Systems

Applications on the smartphones are able to capitalize on the increasingly advanced hardware to provide a user experience reasonably impressive. However, the advancement of these applications are hindered battery lifetime of the smartphones. The battery technologies have a relatively low growth rate. Applications like mobile multiplayer games are especially power hungry as they maximize the use of the network, display and CPU resources. The PGTP, presented in this paper is aware of both the transport requirement of these multiplayer mobile games and the limitation posed by battery resource. PGTP dynamically controls the transport based on the criticality of game state …

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Hard Truths About Heart Work: An Interview With Jennie Chua, Lien Centre For Social Innovation Jan 2011

Hard Truths About Heart Work: An Interview With Jennie Chua, Lien Centre For Social Innovation

Social Space

Just as there are calls for leadership to bridge the business and social worlds, there are also calls for new models and inspiration in the nonprofit sector. Social Space catches up with the inimitable Jennie Chua,fundraiser and chairman of the Community Chest, to hear her thoughts on these issues. True to form, Jennie delivers a few hard truths about fundraising and charity in Singapore.

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Social Innovation Challenge Prizes: More Than Just The Money, Laura Bunt Jan 2011

Social Innovation Challenge Prizes: More Than Just The Money, Laura Bunt

Social Space

Beyond the hype and happiness of winning, when it comes to finding social solutions, innovation prizes are serious business. Laura Buntexplains why.

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Model Selection In Validation Sampling Data: An Asymptotic Likelihood-Based Lasso Approach, Chenlei Leng, Denis H. Y. Leung Jan 2011

Model Selection In Validation Sampling Data: An Asymptotic Likelihood-Based Lasso Approach, Chenlei Leng, Denis H. Y. Leung

Research Collection School Of Economics

We propose an asymptotic likelihood-based LASSO approach for model selection in regression analysis when data are subject to validation sampling. The method makes use of an initial estimator of the regression coefficients and their asymptotic covariance matrix to form an asymptotic likelihood. This ``working'' objective function facilitates the formulation of the LASSO and the implementation of a fast algorithm. Our method circumvents the need to use a likelihood set-up that requires full distributional assumptions about the data. We show that the resulting estimator is consistent in model selection and that the method has lower prediction errors than a model that …

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The Impact Of Transaction Duration, Volume And Direction On Price Dynamics And Volatility, Anthony S. Tay, Christopher Ting, Yiu Kuen Tse, Mitchell Warachka Jan 2011

The Impact Of Transaction Duration, Volume And Direction On Price Dynamics And Volatility, Anthony S. Tay, Christopher Ting, Yiu Kuen Tse, Mitchell Warachka

Research Collection School Of Economics

We explore the role of trade volume, trade direction, and the duration between trades in explaining price dynamics and volatility using an Asymmetric Autoregressive Conditional Duration model applied to intraday transactions data. Our results suggest that volume, direction and duration are important determinants of price dynamics, while duration is also an important determinant of volatility. However, the impact of volume and direction on volatility is marginal after controlling for duration, and the impact of volume on volatility appears to be confined to periods of infrequent trading.

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The Business Model In Practice And Its Implications For Entrepreneurship Research, Gerard George, Adam J. Bock Jan 2011

The Business Model In Practice And Its Implications For Entrepreneurship Research, Gerard George, Adam J. Bock

Research Collection Lee Kong Chian School Of Business

While the term 'business model' has gained widespread use in the practice community, the academic literature on this topic is fragmented and confounded by inconsistent definitions and construct boundaries. In this study, we review prior research and reframe the business model with an entrepreneurial lens. We report on a discourse analysis of 151 surveys of practicing managers to better understand their conceptualization of a business model. We find that the underlying dimensions of the business model are resource structure, transactive structure, and value structure, and discuss the nature and implications of dimensional dominance for firm characteristics and behavior. These findings …

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